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apache / calcite / 5b8ce9c477dcf6ea4848b14982a11bd2e6ebe556 / . / core / src / main / java / org / apache / calcite / sql2rel / SqlToRelConverter.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.calcite.sql2rel;
import org.apache.calcite.avatica.util.Spaces;
import org.apache.calcite.linq4j.Ord;
import org.apache.calcite.plan.Convention;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelOptSamplingParameters;
import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.plan.RelOptUtil;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.plan.ViewExpanders;
import org.apache.calcite.prepare.Prepare;
import org.apache.calcite.prepare.RelOptTableImpl;
import org.apache.calcite.rel.RelCollation;
import org.apache.calcite.rel.RelCollationTraitDef;
import org.apache.calcite.rel.RelCollations;
import org.apache.calcite.rel.RelFieldCollation;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelRoot;
import org.apache.calcite.rel.RelShuttleImpl;
import org.apache.calcite.rel.SingleRel;
import org.apache.calcite.rel.core.AggregateCall;
import org.apache.calcite.rel.core.Collect;
import org.apache.calcite.rel.core.CorrelationId;
import org.apache.calcite.rel.core.Filter;
import org.apache.calcite.rel.core.Join;
import org.apache.calcite.rel.core.JoinInfo;
import org.apache.calcite.rel.core.JoinRelType;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.core.RelFactories;
import org.apache.calcite.rel.core.Sample;
import org.apache.calcite.rel.core.Sort;
import org.apache.calcite.rel.hint.HintStrategyTable;
import org.apache.calcite.rel.hint.Hintable;
import org.apache.calcite.rel.hint.RelHint;
import org.apache.calcite.rel.logical.LogicalAggregate;
import org.apache.calcite.rel.logical.LogicalCorrelate;
import org.apache.calcite.rel.logical.LogicalFilter;
import org.apache.calcite.rel.logical.LogicalIntersect;
import org.apache.calcite.rel.logical.LogicalJoin;
import org.apache.calcite.rel.logical.LogicalMatch;
import org.apache.calcite.rel.logical.LogicalMinus;
import org.apache.calcite.rel.logical.LogicalProject;
import org.apache.calcite.rel.logical.LogicalSort;
import org.apache.calcite.rel.logical.LogicalTableFunctionScan;
import org.apache.calcite.rel.logical.LogicalTableModify;
import org.apache.calcite.rel.logical.LogicalTableScan;
import org.apache.calcite.rel.logical.LogicalUnion;
import org.apache.calcite.rel.logical.LogicalValues;
import org.apache.calcite.rel.metadata.RelColumnMapping;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rel.stream.Delta;
import org.apache.calcite.rel.stream.LogicalDelta;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.rel.type.RelDataTypeField;
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexCall;
import org.apache.calcite.rex.RexCorrelVariable;
import org.apache.calcite.rex.RexDynamicParam;
import org.apache.calcite.rex.RexFieldAccess;
import org.apache.calcite.rex.RexFieldCollation;
import org.apache.calcite.rex.RexInputRef;
import org.apache.calcite.rex.RexLiteral;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.rex.RexPatternFieldRef;
import org.apache.calcite.rex.RexRangeRef;
import org.apache.calcite.rex.RexShuttle;
import org.apache.calcite.rex.RexSubQuery;
import org.apache.calcite.rex.RexUtil;
import org.apache.calcite.rex.RexWindowBound;
import org.apache.calcite.rex.RexWindowBounds;
import org.apache.calcite.schema.ColumnStrategy;
import org.apache.calcite.schema.ModifiableTable;
import org.apache.calcite.schema.ModifiableView;
import org.apache.calcite.schema.Table;
import org.apache.calcite.schema.TranslatableTable;
import org.apache.calcite.schema.Wrapper;
import org.apache.calcite.sql.JoinConditionType;
import org.apache.calcite.sql.JoinType;
import org.apache.calcite.sql.SqlAggFunction;
import org.apache.calcite.sql.SqlBasicCall;
import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlCallBinding;
import org.apache.calcite.sql.SqlDataTypeSpec;
import org.apache.calcite.sql.SqlDelete;
import org.apache.calcite.sql.SqlDynamicParam;
import org.apache.calcite.sql.SqlExplainFormat;
import org.apache.calcite.sql.SqlExplainLevel;
import org.apache.calcite.sql.SqlFunction;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlInsert;
import org.apache.calcite.sql.SqlIntervalQualifier;
import org.apache.calcite.sql.SqlJoin;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlLiteral;
import org.apache.calcite.sql.SqlMatchRecognize;
import org.apache.calcite.sql.SqlMerge;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlNumericLiteral;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlOperatorTable;
import org.apache.calcite.sql.SqlOrderBy;
import org.apache.calcite.sql.SqlPivot;
import org.apache.calcite.sql.SqlSampleSpec;
import org.apache.calcite.sql.SqlSelect;
import org.apache.calcite.sql.SqlSelectKeyword;
import org.apache.calcite.sql.SqlSetOperator;
import org.apache.calcite.sql.SqlSnapshot;
import org.apache.calcite.sql.SqlUnnestOperator;
import org.apache.calcite.sql.SqlUnpivot;
import org.apache.calcite.sql.SqlUpdate;
import org.apache.calcite.sql.SqlUtil;
import org.apache.calcite.sql.SqlValuesOperator;
import org.apache.calcite.sql.SqlWindow;
import org.apache.calcite.sql.SqlWith;
import org.apache.calcite.sql.SqlWithItem;
import org.apache.calcite.sql.fun.SqlCase;
import org.apache.calcite.sql.fun.SqlInOperator;
import org.apache.calcite.sql.fun.SqlQuantifyOperator;
import org.apache.calcite.sql.fun.SqlRowOperator;
import org.apache.calcite.sql.fun.SqlStdOperatorTable;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.sql.type.SqlReturnTypeInference;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.calcite.sql.type.SqlTypeUtil;
import org.apache.calcite.sql.type.TableFunctionReturnTypeInference;
import org.apache.calcite.sql.util.SqlBasicVisitor;
import org.apache.calcite.sql.util.SqlVisitor;
import org.apache.calcite.sql.validate.AggregatingSelectScope;
import org.apache.calcite.sql.validate.CollectNamespace;
import org.apache.calcite.sql.validate.DelegatingScope;
import org.apache.calcite.sql.validate.ListScope;
import org.apache.calcite.sql.validate.MatchRecognizeScope;
import org.apache.calcite.sql.validate.ParameterScope;
import org.apache.calcite.sql.validate.SelectScope;
import org.apache.calcite.sql.validate.SqlMonotonicity;
import org.apache.calcite.sql.validate.SqlNameMatcher;
import org.apache.calcite.sql.validate.SqlQualified;
import org.apache.calcite.sql.validate.SqlUserDefinedTableFunction;
import org.apache.calcite.sql.validate.SqlUserDefinedTableMacro;
import org.apache.calcite.sql.validate.SqlValidator;
import org.apache.calcite.sql.validate.SqlValidatorImpl;
import org.apache.calcite.sql.validate.SqlValidatorNamespace;
import org.apache.calcite.sql.validate.SqlValidatorScope;
import org.apache.calcite.sql.validate.SqlValidatorTable;
import org.apache.calcite.sql.validate.SqlValidatorUtil;
import org.apache.calcite.tools.RelBuilder;
import org.apache.calcite.tools.RelBuilderFactory;
import org.apache.calcite.util.ImmutableBeans;
import org.apache.calcite.util.ImmutableBitSet;
import org.apache.calcite.util.ImmutableIntList;
import org.apache.calcite.util.Litmus;
import org.apache.calcite.util.NlsString;
import org.apache.calcite.util.NumberUtil;
import org.apache.calcite.util.Pair;
import org.apache.calcite.util.Util;
import org.apache.calcite.util.trace.CalciteTrace;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.slf4j.Logger;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.util.AbstractList;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeSet;
import java.util.function.BiFunction;
import java.util.function.Supplier;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import static org.apache.calcite.linq4j.Nullness.castNonNull;
import static org.apache.calcite.sql.SqlUtil.stripAs;
import static java.util.Objects.requireNonNull;
/**
* Converts a SQL parse tree (consisting of
* {@link org.apache.calcite.sql.SqlNode} objects) into a relational algebra
* expression (consisting of {@link org.apache.calcite.rel.RelNode} objects).
*
* <p>The public entry points are: {@link #convertQuery},
* {@link #convertExpression(SqlNode)}.
*/
@SuppressWarnings("UnstableApiUsage")
public class SqlToRelConverter {
//~ Static fields/initializers ---------------------------------------------
/** Default configuration. */
private static final Config CONFIG =
ImmutableBeans.create(Config.class)
.withRelBuilderFactory(RelFactories.LOGICAL_BUILDER)
.withRelBuilderConfigTransform(c -> c.withPushJoinCondition(true))
.withHintStrategyTable(HintStrategyTable.EMPTY);
protected static final Logger SQL2REL_LOGGER =
CalciteTrace.getSqlToRelTracer();
/** Size of the smallest IN list that will be converted to a semijoin to a
* static table. */
public static final int DEFAULT_IN_SUB_QUERY_THRESHOLD = 20;
@Deprecated // to be removed before 2.0
public static final int DEFAULT_IN_SUBQUERY_THRESHOLD =
DEFAULT_IN_SUB_QUERY_THRESHOLD;
//~ Instance fields --------------------------------------------------------
protected final @Nullable SqlValidator validator;
protected final RexBuilder rexBuilder;
protected final Prepare.CatalogReader catalogReader;
protected final RelOptCluster cluster;
private SubQueryConverter subQueryConverter;
protected final Map<RelNode, Integer> leaves = new HashMap<>();
private final List<@Nullable SqlDynamicParam> dynamicParamSqlNodes = new ArrayList<>();
private final SqlOperatorTable opTab;
protected final RelDataTypeFactory typeFactory;
private final SqlNodeToRexConverter exprConverter;
private final HintStrategyTable hintStrategies;
private int explainParamCount;
public final SqlToRelConverter.Config config;
private final RelBuilder relBuilder;
/**
* Fields used in name resolution for correlated sub-queries.
*/
private final Map<CorrelationId, DeferredLookup> mapCorrelToDeferred =
new HashMap<>();
/**
* Stack of names of datasets requested by the <code>
* TABLE(SAMPLE(&lt;datasetName&gt;, &lt;query&gt;))</code> construct.
*/
private final Deque<String> datasetStack = new ArrayDeque<>();
/**
* Mapping of non-correlated sub-queries that have been converted to their
* equivalent constants. Used to avoid re-evaluating the sub-query if it's
* already been evaluated.
*/
private final Map<SqlNode, RexNode> mapConvertedNonCorrSubqs =
new HashMap<>();
public final RelOptTable.ViewExpander viewExpander;
//~ Constructors -----------------------------------------------------------
/**
* Creates a converter.
*
* @param viewExpander Preparing statement
* @param validator Validator
* @param catalogReader Schema
* @param planner Planner
* @param rexBuilder Rex builder
* @param convertletTable Expression converter
*/
@Deprecated // to be removed before 2.0
public SqlToRelConverter(
RelOptTable.ViewExpander viewExpander,
SqlValidator validator,
Prepare.CatalogReader catalogReader,
RelOptPlanner planner,
RexBuilder rexBuilder,
SqlRexConvertletTable convertletTable) {
this(viewExpander, validator, catalogReader,
RelOptCluster.create(planner, rexBuilder), convertletTable, SqlToRelConverter.config());
}
@Deprecated // to be removed before 2.0
public SqlToRelConverter(
RelOptTable.ViewExpander viewExpander,
SqlValidator validator,
Prepare.CatalogReader catalogReader,
RelOptCluster cluster,
SqlRexConvertletTable convertletTable) {
this(viewExpander, validator, catalogReader, cluster, convertletTable,
SqlToRelConverter.config());
}
/* Creates a converter. */
public SqlToRelConverter(
RelOptTable.ViewExpander viewExpander,
@Nullable SqlValidator validator,
Prepare.CatalogReader catalogReader,
RelOptCluster cluster,
SqlRexConvertletTable convertletTable,
Config config) {
this.viewExpander = viewExpander;
this.opTab =
(validator
== null) ? SqlStdOperatorTable.instance()
: validator.getOperatorTable();
this.validator = validator;
this.catalogReader = catalogReader;
this.subQueryConverter = new NoOpSubQueryConverter();
this.rexBuilder = cluster.getRexBuilder();
this.typeFactory = rexBuilder.getTypeFactory();
this.exprConverter = new SqlNodeToRexConverterImpl(convertletTable);
this.explainParamCount = 0;
this.config = requireNonNull(config, "config");
this.relBuilder = config.getRelBuilderFactory().create(cluster, null)
.transform(config.getRelBuilderConfigTransform());
this.hintStrategies = config.getHintStrategyTable();
cluster.setHintStrategies(this.hintStrategies);
this.cluster = requireNonNull(cluster, "cluster");
}
//~ Methods ----------------------------------------------------------------
private SqlValidator validator() {
return requireNonNull(validator, "validator");
}
private <T extends SqlValidatorNamespace> T getNamespace(SqlNode node) {
//noinspection unchecked
return (T) requireNonNull(
getNamespaceOrNull(node),
() -> "Namespace is not found for " + node);
}
@SuppressWarnings("unchecked")
private <T extends SqlValidatorNamespace> @Nullable T getNamespaceOrNull(SqlNode node) {
return (@Nullable T) validator().getNamespace(node);
}
/** Returns the RelOptCluster in use. */
public RelOptCluster getCluster() {
return cluster;
}
/**
* Returns the row-expression builder.
*/
public RexBuilder getRexBuilder() {
return rexBuilder;
}
/**
* Returns the number of dynamic parameters encountered during translation;
* this must only be called after {@link #convertQuery}.
*
* @return number of dynamic parameters
*/
public int getDynamicParamCount() {
return dynamicParamSqlNodes.size();
}
/**
* Returns the type inferred for a dynamic parameter.
*
* @param index 0-based index of dynamic parameter
* @return inferred type, never null
*/
public RelDataType getDynamicParamType(int index) {
SqlNode sqlNode = dynamicParamSqlNodes.get(index);
if (sqlNode == null) {
throw Util.needToImplement("dynamic param type inference");
}
return validator().getValidatedNodeType(sqlNode);
}
/**
* Returns the current count of the number of dynamic parameters in an
* EXPLAIN PLAN statement.
*
* @param increment if true, increment the count
* @return the current count before the optional increment
*/
public int getDynamicParamCountInExplain(boolean increment) {
int retVal = explainParamCount;
if (increment) {
++explainParamCount;
}
return retVal;
}
/** Returns the mapping of non-correlated sub-queries that have been converted
* to the constants that they evaluate to. */
public Map<SqlNode, RexNode> getMapConvertedNonCorrSubqs() {
return mapConvertedNonCorrSubqs;
}
/**
* Adds to the current map of non-correlated converted sub-queries the
* elements from another map that contains non-correlated sub-queries that
* have been converted by another SqlToRelConverter.
*
* @param alreadyConvertedNonCorrSubqs the other map
*/
public void addConvertedNonCorrSubqs(
Map<SqlNode, RexNode> alreadyConvertedNonCorrSubqs) {
mapConvertedNonCorrSubqs.putAll(alreadyConvertedNonCorrSubqs);
}
/**
* Sets a new SubQueryConverter. To have any effect, this must be called
* before any convert method.
*
* @param converter new SubQueryConverter
*/
public void setSubQueryConverter(SubQueryConverter converter) {
subQueryConverter = converter;
}
/**
* Sets the number of dynamic parameters in the current EXPLAIN PLAN
* statement.
*
* @param explainParamCount number of dynamic parameters in the statement
*/
public void setDynamicParamCountInExplain(int explainParamCount) {
assert config.isExplain();
this.explainParamCount = explainParamCount;
}
private void checkConvertedType(SqlNode query, RelNode result) {
if (query.isA(SqlKind.DML)) {
return;
}
// Verify that conversion from SQL to relational algebra did
// not perturb any type information. (We can't do this if the
// SQL statement is something like an INSERT which has no
// validator type information associated with its result,
// hence the namespace check above.)
final List<RelDataTypeField> validatedFields =
validator().getValidatedNodeType(query).getFieldList();
final RelDataType validatedRowType =
validator().getTypeFactory().createStructType(
Pair.right(validatedFields),
SqlValidatorUtil.uniquify(Pair.left(validatedFields),
catalogReader.nameMatcher().isCaseSensitive()));
final List<RelDataTypeField> convertedFields =
result.getRowType().getFieldList().subList(0, validatedFields.size());
final RelDataType convertedRowType =
validator().getTypeFactory().createStructType(convertedFields);
if (!RelOptUtil.equal("validated row type", validatedRowType,
"converted row type", convertedRowType, Litmus.IGNORE)) {
throw new AssertionError("Conversion to relational algebra failed to "
+ "preserve datatypes:\n"
+ "validated type:\n"
+ validatedRowType.getFullTypeString()
+ "\nconverted type:\n"
+ convertedRowType.getFullTypeString()
+ "\nrel:\n"
+ RelOptUtil.toString(result));
}
}
public RelNode flattenTypes(
RelNode rootRel,
boolean restructure) {
RelStructuredTypeFlattener typeFlattener =
new RelStructuredTypeFlattener(relBuilder,
rexBuilder, createToRelContext(ImmutableList.of()), restructure);
return typeFlattener.rewrite(rootRel);
}
/**
* If sub-query is correlated and decorrelation is enabled, performs
* decorrelation.
*
* @param query Query
* @param rootRel Root relational expression
* @return New root relational expression after decorrelation
*/
public RelNode decorrelate(SqlNode query, RelNode rootRel) {
if (!config.isDecorrelationEnabled()) {
return rootRel;
}
final RelNode result = decorrelateQuery(rootRel);
if (result != rootRel) {
checkConvertedType(query, result);
}
return result;
}
/**
* Walks over a tree of relational expressions, replacing each
* {@link RelNode} with a 'slimmed down' relational expression that projects
* only the fields required by its consumer.
*
* <p>This may make things easier for the optimizer, by removing crud that
* would expand the search space, but is difficult for the optimizer itself
* to do it, because optimizer rules must preserve the number and type of
* fields. Hence, this transform that operates on the entire tree, similar
* to the {@link RelStructuredTypeFlattener type-flattening transform}.
*
* <p>Currently this functionality is disabled in farrago/luciddb; the
* default implementation of this method does nothing.
*
* @param ordered Whether the relational expression must produce results in
* a particular order (typically because it has an ORDER BY at top level)
* @param rootRel Relational expression that is at the root of the tree
* @return Trimmed relational expression
*/
public RelNode trimUnusedFields(boolean ordered, RelNode rootRel) {
// Trim fields that are not used by their consumer.
if (isTrimUnusedFields()) {
final RelFieldTrimmer trimmer = newFieldTrimmer();
final List<RelCollation> collations =
rootRel.getTraitSet().getTraits(RelCollationTraitDef.INSTANCE);
rootRel = trimmer.trim(rootRel);
if (!ordered
&& collations != null
&& !collations.isEmpty()
&& !collations.equals(ImmutableList.of(RelCollations.EMPTY))) {
final RelTraitSet traitSet = rootRel.getTraitSet()
.replace(RelCollationTraitDef.INSTANCE, collations);
rootRel = rootRel.copy(traitSet, rootRel.getInputs());
}
if (SQL2REL_LOGGER.isDebugEnabled()) {
SQL2REL_LOGGER.debug(
RelOptUtil.dumpPlan("Plan after trimming unused fields", rootRel,
SqlExplainFormat.TEXT, SqlExplainLevel.EXPPLAN_ATTRIBUTES));
}
}
return rootRel;
}
/**
* Creates a RelFieldTrimmer.
*
* @return Field trimmer
*/
protected RelFieldTrimmer newFieldTrimmer() {
return new RelFieldTrimmer(validator, relBuilder);
}
/**
* Converts an unvalidated query's parse tree into a relational expression.
*
* @param query Query to convert
* @param needsValidation Whether to validate the query before converting;
* <code>false</code> if the query has already been
* validated.
* @param top Whether the query is top-level, say if its result
* will become a JDBC result set; <code>false</code> if
* the query will be part of a view.
*/
public RelRoot convertQuery(
SqlNode query,
final boolean needsValidation,
final boolean top) {
if (needsValidation) {
query = validator().validate(query);
}
RelNode result = convertQueryRecursive(query, top, null).rel;
if (top) {
if (isStream(query)) {
result = new LogicalDelta(cluster, result.getTraitSet(), result);
}
}
RelCollation collation = RelCollations.EMPTY;
if (!query.isA(SqlKind.DML)) {
if (isOrdered(query)) {
collation = requiredCollation(result);
}
}
checkConvertedType(query, result);
if (SQL2REL_LOGGER.isDebugEnabled()) {
SQL2REL_LOGGER.debug(
RelOptUtil.dumpPlan("Plan after converting SqlNode to RelNode",
result, SqlExplainFormat.TEXT,
SqlExplainLevel.EXPPLAN_ATTRIBUTES));
}
final RelDataType validatedRowType = validator().getValidatedNodeType(query);
List<RelHint> hints = new ArrayList<>();
if (query.getKind() == SqlKind.SELECT) {
final SqlSelect select = (SqlSelect) query;
if (select.hasHints()) {
hints = SqlUtil.getRelHint(hintStrategies, select.getHints());
}
}
// propagate the hints.
result = RelOptUtil.propagateRelHints(result, false);
return RelRoot.of(result, validatedRowType, query.getKind())
.withCollation(collation)
.withHints(hints);
}
private static boolean isStream(SqlNode query) {
return query instanceof SqlSelect
&& ((SqlSelect) query).isKeywordPresent(SqlSelectKeyword.STREAM);
}
public static boolean isOrdered(SqlNode query) {
switch (query.getKind()) {
case SELECT:
SqlNodeList orderList = ((SqlSelect) query).getOrderList();
return orderList != null
&& orderList.size() > 0;
case WITH:
return isOrdered(((SqlWith) query).body);
case ORDER_BY:
return ((SqlOrderBy) query).orderList.size() > 0;
default:
return false;
}
}
private static RelCollation requiredCollation(RelNode r) {
if (r instanceof Sort) {
return ((Sort) r).collation;
}
if (r instanceof Project) {
return requiredCollation(((Project) r).getInput());
}
if (r instanceof Delta) {
return requiredCollation(((Delta) r).getInput());
}
throw new AssertionError();
}
/**
* Converts a SELECT statement's parse tree into a relational expression.
*/
public RelNode convertSelect(SqlSelect select, boolean top) {
final SqlValidatorScope selectScope = validator().getWhereScope(select);
final Blackboard bb = createBlackboard(selectScope, null, top);
convertSelectImpl(bb, select);
return castNonNull(bb.root);
}
/**
* Factory method for creating translation workspace.
*/
protected Blackboard createBlackboard(@Nullable SqlValidatorScope scope,
@Nullable Map<String, RexNode> nameToNodeMap, boolean top) {
return new Blackboard(scope, nameToNodeMap, top);
}
/**
* Implementation of {@link #convertSelect(SqlSelect, boolean)};
* derived class may override.
*/
protected void convertSelectImpl(
final Blackboard bb,
SqlSelect select) {
convertFrom(
bb,
select.getFrom());
convertWhere(
bb,
select.getWhere());
final List<SqlNode> orderExprList = new ArrayList<>();
final List<RelFieldCollation> collationList = new ArrayList<>();
gatherOrderExprs(
bb,
select,
select.getOrderList(),
orderExprList,
collationList);
final RelCollation collation =
cluster.traitSet().canonize(RelCollations.of(collationList));
if (validator().isAggregate(select)) {
convertAgg(
bb,
select,
orderExprList);
} else {
convertSelectList(
bb,
select,
orderExprList);
}
if (select.isDistinct()) {
distinctify(bb, true);
}
convertOrder(
select, bb, collation, orderExprList, select.getOffset(),
select.getFetch());
if (select.hasHints()) {
final List<RelHint> hints = SqlUtil.getRelHint(hintStrategies, select.getHints());
// Attach the hints to the first Hintable node we found from the root node.
bb.setRoot(bb.root()
.accept(
new RelShuttleImpl() {
boolean attached = false;
@Override public RelNode visitChild(RelNode parent, int i, RelNode child) {
if (parent instanceof Hintable && !attached) {
attached = true;
return ((Hintable) parent).attachHints(hints);
} else {
return super.visitChild(parent, i, child);
}
}
}), true);
} else {
bb.setRoot(bb.root(), true);
}
}
/**
* Having translated 'SELECT ... FROM ... [GROUP BY ...] [HAVING ...]', adds
* a relational expression to make the results unique.
*
* <p>If the SELECT clause contains duplicate expressions, adds
* {@link org.apache.calcite.rel.logical.LogicalProject}s so that we are
* grouping on the minimal set of keys. The performance gain isn't huge, but
* it is difficult to detect these duplicate expressions later.
*
* @param bb Blackboard
* @param checkForDupExprs Check for duplicate expressions
*/
private void distinctify(
Blackboard bb,
boolean checkForDupExprs) {
// Look for duplicate expressions in the project.
// Say we have 'select x, y, x, z'.
// Then dups will be {[2, 0]}
// and oldToNew will be {[0, 0], [1, 1], [2, 0], [3, 2]}
RelNode rel = bb.root;
if (checkForDupExprs && (rel instanceof LogicalProject)) {
LogicalProject project = (LogicalProject) rel;
final List<RexNode> projectExprs = project.getProjects();
final List<Integer> origins = new ArrayList<>();
int dupCount = 0;
for (int i = 0; i < projectExprs.size(); i++) {
int x = projectExprs.indexOf(projectExprs.get(i));
if (x >= 0 && x < i) {
origins.add(x);
++dupCount;
} else {
origins.add(i);
}
}
if (dupCount == 0) {
distinctify(bb, false);
return;
}
final Map<Integer, Integer> squished = new HashMap<>();
final List<RelDataTypeField> fields = rel.getRowType().getFieldList();
final List<Pair<RexNode, String>> newProjects = new ArrayList<>();
for (int i = 0; i < fields.size(); i++) {
if (origins.get(i) == i) {
squished.put(i, newProjects.size());
newProjects.add(RexInputRef.of2(i, fields));
}
}
rel =
LogicalProject.create(rel, ImmutableList.of(),
Pair.left(newProjects), Pair.right(newProjects));
bb.root = rel;
distinctify(bb, false);
rel = bb.root();
// Create the expressions to reverse the mapping.
// Project($0, $1, $0, $2).
final List<Pair<RexNode, String>> undoProjects = new ArrayList<>();
for (int i = 0; i < fields.size(); i++) {
final int origin = origins.get(i);
RelDataTypeField field = fields.get(i);
undoProjects.add(
Pair.of(
new RexInputRef(
castNonNull(squished.get(origin)),
field.getType()),
field.getName()));
}
rel =
LogicalProject.create(rel, ImmutableList.of(),
Pair.left(undoProjects), Pair.right(undoProjects));
bb.setRoot(
rel,
false);
return;
}
assert rel != null : "rel must not be null, root = " + bb.root;
// Usual case: all of the expressions in the SELECT clause are
// different.
final ImmutableBitSet groupSet =
ImmutableBitSet.range(rel.getRowType().getFieldCount());
rel = createAggregate(bb, groupSet, ImmutableList.of(groupSet),
ImmutableList.of());
bb.setRoot(
rel,
false);
}
/**
* Converts a query's ORDER BY clause, if any.
*
* <p>Ignores the ORDER BY clause if the query is not top-level and FETCH or
* OFFSET are not present.
*
* @param select Query
* @param bb Blackboard
* @param collation Collation list
* @param orderExprList Method populates this list with orderBy expressions
* not present in selectList
* @param offset Expression for number of rows to discard before
* returning first row
* @param fetch Expression for number of rows to fetch
*/
protected void convertOrder(
SqlSelect select,
Blackboard bb,
RelCollation collation,
List<SqlNode> orderExprList,
@Nullable SqlNode offset,
@Nullable SqlNode fetch) {
if (removeSortInSubQuery(bb.top)
|| select.getOrderList() == null
|| select.getOrderList().isEmpty()) {
assert removeSortInSubQuery(bb.top) || collation.getFieldCollations().isEmpty();
if ((offset == null
|| (offset instanceof SqlLiteral
&& Objects.equals(((SqlLiteral) offset).bigDecimalValue(), BigDecimal.ZERO)))
&& fetch == null) {
return;
}
}
// Create a sorter using the previously constructed collations.
bb.setRoot(
LogicalSort.create(bb.root(), collation,
offset == null ? null : convertExpression(offset),
fetch == null ? null : convertExpression(fetch)),
false);
// If extra expressions were added to the project list for sorting,
// add another project to remove them. But make the collation empty, because
// we can't represent the real collation.
//
// If it is the top node, use the real collation, but don't trim fields.
if (orderExprList.size() > 0 && !bb.top) {
final List<RexNode> exprs = new ArrayList<>();
final RelDataType rowType = bb.root().getRowType();
final int fieldCount =
rowType.getFieldCount() - orderExprList.size();
for (int i = 0; i < fieldCount; i++) {
exprs.add(rexBuilder.makeInputRef(bb.root(), i));
}
bb.setRoot(
LogicalProject.create(bb.root(),
ImmutableList.of(),
exprs,
rowType.getFieldNames().subList(0, fieldCount)),
false);
}
}
/**
* Returns whether we should remove the sort for the subsequent query conversion.
*
* @param top Whether the rel to convert is the root of the query
*/
private boolean removeSortInSubQuery(boolean top) {
return config.isRemoveSortInSubQuery() && !top;
}
/**
* Returns whether a given node contains a {@link SqlInOperator}.
*
* @param node a RexNode tree
*/
private static boolean containsInOperator(
SqlNode node) {
try {
SqlVisitor<Void> visitor =
new SqlBasicVisitor<Void>() {
@Override public Void visit(SqlCall call) {
if (call.getOperator() instanceof SqlInOperator) {
throw new Util.FoundOne(call);
}
return super.visit(call);
}
};
node.accept(visitor);
return false;
} catch (Util.FoundOne e) {
Util.swallow(e, null);
return true;
}
}
/**
* Push down all the NOT logical operators into any IN/NOT IN operators.
*
* @param scope Scope where {@code sqlNode} occurs
* @param sqlNode the root node from which to look for NOT operators
* @return the transformed SqlNode representation with NOT pushed down.
*/
private static SqlNode pushDownNotForIn(SqlValidatorScope scope,
SqlNode sqlNode) {
if (!(sqlNode instanceof SqlCall) || !containsInOperator(sqlNode)) {
return sqlNode;
}
final SqlCall sqlCall = (SqlCall) sqlNode;
switch (sqlCall.getKind()) {
case AND:
case OR:
final List<SqlNode> operands = new ArrayList<>();
for (SqlNode operand : sqlCall.getOperandList()) {
operands.add(pushDownNotForIn(scope, operand));
}
final SqlCall newCall =
sqlCall.getOperator().createCall(sqlCall.getParserPosition(),
operands);
return reg(scope, newCall);
case NOT:
assert sqlCall.operand(0) instanceof SqlCall;
final SqlCall call = sqlCall.operand(0);
switch (sqlCall.operand(0).getKind()) {
case CASE:
final SqlCase caseNode = (SqlCase) call;
final SqlNodeList thenOperands = new SqlNodeList(SqlParserPos.ZERO);
for (SqlNode thenOperand : caseNode.getThenOperands()) {
final SqlCall not =
SqlStdOperatorTable.NOT.createCall(SqlParserPos.ZERO,
thenOperand);
thenOperands.add(pushDownNotForIn(scope, reg(scope, not)));
}
SqlNode elseOperand = requireNonNull(
caseNode.getElseOperand(),
"getElseOperand for " + caseNode);
if (!SqlUtil.isNull(elseOperand)) {
// "not(unknown)" is "unknown", so no need to simplify
final SqlCall not =
SqlStdOperatorTable.NOT.createCall(SqlParserPos.ZERO,
elseOperand);
elseOperand = pushDownNotForIn(scope, reg(scope, not));
}
return reg(scope,
SqlStdOperatorTable.CASE.createCall(SqlParserPos.ZERO,
caseNode.getValueOperand(),
caseNode.getWhenOperands(),
thenOperands,
elseOperand));
case AND:
final List<SqlNode> orOperands = new ArrayList<>();
for (SqlNode operand : call.getOperandList()) {
orOperands.add(
pushDownNotForIn(scope,
reg(scope,
SqlStdOperatorTable.NOT.createCall(SqlParserPos.ZERO,
operand))));
}
return reg(scope,
SqlStdOperatorTable.OR.createCall(SqlParserPos.ZERO,
orOperands));
case OR:
final List<SqlNode> andOperands = new ArrayList<>();
for (SqlNode operand : call.getOperandList()) {
andOperands.add(
pushDownNotForIn(scope,
reg(scope,
SqlStdOperatorTable.NOT.createCall(SqlParserPos.ZERO,
operand))));
}
return reg(scope,
SqlStdOperatorTable.AND.createCall(SqlParserPos.ZERO,
andOperands));
case NOT:
assert call.operandCount() == 1;
return pushDownNotForIn(scope, call.operand(0));
case NOT_IN:
return reg(scope,
SqlStdOperatorTable.IN.createCall(SqlParserPos.ZERO,
call.getOperandList()));
case IN:
return reg(scope,
SqlStdOperatorTable.NOT_IN.createCall(SqlParserPos.ZERO,
call.getOperandList()));
default:
break;
}
break;
default:
break;
}
return sqlNode;
}
/** Registers with the validator a {@link SqlNode} that has been created
* during the Sql-to-Rel process. */
private static SqlNode reg(SqlValidatorScope scope, SqlNode e) {
scope.getValidator().deriveType(scope, e);
return e;
}
/**
* Converts a WHERE clause.
*
* @param bb Blackboard
* @param where WHERE clause, may be null
*/
private void convertWhere(
final Blackboard bb,
final @Nullable SqlNode where) {
if (where == null) {
return;
}
SqlNode newWhere = pushDownNotForIn(bb.scope(), where);
replaceSubQueries(bb, newWhere, RelOptUtil.Logic.UNKNOWN_AS_FALSE);
final RexNode convertedWhere = bb.convertExpression(newWhere);
final RexNode convertedWhere2 =
RexUtil.removeNullabilityCast(typeFactory, convertedWhere);
// only allocate filter if the condition is not TRUE
if (convertedWhere2.isAlwaysTrue()) {
return;
}
final RelFactories.FilterFactory filterFactory =
RelFactories.DEFAULT_FILTER_FACTORY;
final RelNode filter =
filterFactory.createFilter(bb.root(), convertedWhere2, ImmutableSet.of());
final RelNode r;
final CorrelationUse p = getCorrelationUse(bb, filter);
if (p != null) {
assert p.r instanceof Filter;
Filter f = (Filter) p.r;
r = LogicalFilter.create(f.getInput(), f.getCondition(),
ImmutableSet.of(p.id));
} else {
r = filter;
}
bb.setRoot(r, false);
}
private void replaceSubQueries(
final Blackboard bb,
final SqlNode expr,
RelOptUtil.Logic logic) {
findSubQueries(bb, expr, logic, false);
for (SubQuery node : bb.subQueryList) {
substituteSubQuery(bb, node);
}
}
private void substituteSubQuery(Blackboard bb, SubQuery subQuery) {
final RexNode expr = subQuery.expr;
if (expr != null) {
// Already done.
return;
}
final SqlBasicCall call;
final RelNode rel;
final SqlNode query;
final RelOptUtil.Exists converted;
switch (subQuery.node.getKind()) {
case CURSOR:
convertCursor(bb, subQuery);
return;
case MULTISET_QUERY_CONSTRUCTOR:
case MULTISET_VALUE_CONSTRUCTOR:
case ARRAY_QUERY_CONSTRUCTOR:
rel = convertMultisets(ImmutableList.of(subQuery.node), bb);
subQuery.expr = bb.register(rel, JoinRelType.INNER);
return;
case IN:
case NOT_IN:
case SOME:
case ALL:
call = (SqlBasicCall) subQuery.node;
query = call.operand(1);
if (!config.isExpand() && !(query instanceof SqlNodeList)) {
return;
}
final SqlNode leftKeyNode = call.operand(0);
final List<RexNode> leftKeys;
switch (leftKeyNode.getKind()) {
case ROW:
leftKeys = new ArrayList<>();
for (SqlNode sqlExpr : ((SqlBasicCall) leftKeyNode).getOperandList()) {
leftKeys.add(bb.convertExpression(sqlExpr));
}
break;
default:
leftKeys = ImmutableList.of(bb.convertExpression(leftKeyNode));
}
if (query instanceof SqlNodeList) {
SqlNodeList valueList = (SqlNodeList) query;
if (valueList.size() < config.getInSubQueryThreshold()) {
// We're under the threshold, so convert to OR.
subQuery.expr =
convertInToOr(
bb,
leftKeys,
valueList,
(SqlInOperator) call.getOperator());
return;
}
// Otherwise, let convertExists translate
// values list into an inline table for the
// reference to Q below.
}
// Project out the search columns from the left side
// Q1:
// "select from emp where emp.deptno in (select col1 from T)"
//
// is converted to
//
// "select from
// emp inner join (select distinct col1 from T)) q
// on emp.deptno = q.col1
//
// Q2:
// "select from emp where emp.deptno not in (Q)"
//
// is converted to
//
// "select from
// emp left outer join (select distinct col1, TRUE from T) q
// on emp.deptno = q.col1
// where emp.deptno <> null
// and q.indicator <> TRUE"
//
// Note: Sub-query can be used as SqlUpdate#condition like below:
//
// UPDATE emp
// SET empno = 1 WHERE emp.empno IN (
// SELECT emp.empno FROM emp WHERE emp.empno = 2)
//
// In such case, when converting SqlUpdate#condition, bb.root is null
// and it makes no sense to do the sub-query substitution.
if (bb.root == null) {
return;
}
final RelDataType targetRowType =
SqlTypeUtil.promoteToRowType(typeFactory,
validator().getValidatedNodeType(leftKeyNode), null);
final boolean notIn = call.getOperator().kind == SqlKind.NOT_IN;
converted =
convertExists(query, RelOptUtil.SubQueryType.IN, subQuery.logic,
notIn, targetRowType);
if (converted.indicator) {
// Generate
// emp CROSS JOIN (SELECT COUNT(*) AS c,
// COUNT(deptno) AS ck FROM dept)
final RelDataType longType =
typeFactory.createSqlType(SqlTypeName.BIGINT);
final RelNode seek = converted.r.getInput(0); // fragile
final int keyCount = leftKeys.size();
final List<Integer> args = ImmutableIntList.range(0, keyCount);
LogicalAggregate aggregate =
LogicalAggregate.create(seek,
ImmutableList.of(),
ImmutableBitSet.of(),
null,
ImmutableList.of(
AggregateCall.create(SqlStdOperatorTable.COUNT, false,
false, false, ImmutableList.of(), -1, null,
RelCollations.EMPTY, longType, null),
AggregateCall.create(SqlStdOperatorTable.COUNT, false,
false, false, args, -1, null,
RelCollations.EMPTY, longType, null)));
LogicalJoin join =
LogicalJoin.create(bb.root(), aggregate, ImmutableList.of(),
rexBuilder.makeLiteral(true), ImmutableSet.of(), JoinRelType.INNER);
bb.setRoot(join, false);
}
final RexNode rex =
bb.register(converted.r,
converted.outerJoin ? JoinRelType.LEFT : JoinRelType.INNER,
leftKeys);
RelOptUtil.Logic logic = subQuery.logic;
switch (logic) {
case TRUE_FALSE_UNKNOWN:
case UNKNOWN_AS_TRUE:
if (!converted.indicator) {
logic = RelOptUtil.Logic.TRUE_FALSE;
}
break;
default:
break;
}
subQuery.expr = translateIn(logic, bb.root, rex);
if (notIn) {
subQuery.expr =
rexBuilder.makeCall(SqlStdOperatorTable.NOT, subQuery.expr);
}
return;
case EXISTS:
// "select from emp where exists (select a from T)"
//
// is converted to the following if the sub-query is correlated:
//
// "select from emp left outer join (select AGG_TRUE() as indicator
// from T group by corr_var) q where q.indicator is true"
//
// If there is no correlation, the expression is replaced with a
// boolean indicating whether the sub-query returned 0 or >= 1 row.
if (!config.isExpand()) {
return;
}
call = (SqlBasicCall) subQuery.node;
query = call.operand(0);
final SqlValidatorScope seekScope =
(query instanceof SqlSelect)
? validator().getSelectScope((SqlSelect) query)
: null;
final Blackboard seekBb = createBlackboard(seekScope, null, false);
final RelNode seekRel = convertQueryOrInList(seekBb, query, null);
requireNonNull(seekRel, () -> "seekRel is null for query " + query);
// An EXIST sub-query whose inner child has at least 1 tuple
// (e.g. an Aggregate with no grouping columns or non-empty Values
// node) should be simplified to a Boolean constant expression.
final RelMetadataQuery mq = seekRel.getCluster().getMetadataQuery();
final Double minRowCount = mq.getMinRowCount(seekRel);
if (minRowCount != null && minRowCount >= 1D) {
subQuery.expr = rexBuilder.makeLiteral(true);
return;
}
converted = RelOptUtil.createExistsPlan(seekRel,
RelOptUtil.SubQueryType.EXISTS, subQuery.logic, true, relBuilder);
assert !converted.indicator;
if (convertNonCorrelatedSubQuery(subQuery, bb, converted.r, true)) {
return;
}
subQuery.expr = bb.register(converted.r, JoinRelType.LEFT);
return;
case UNIQUE:
return;
case SCALAR_QUERY:
// Convert the sub-query. If it's non-correlated, convert it
// to a constant expression.
if (!config.isExpand()) {
return;
}
call = (SqlBasicCall) subQuery.node;
query = call.operand(0);
converted = convertExists(query, RelOptUtil.SubQueryType.SCALAR,
subQuery.logic, true, null);
assert !converted.indicator;
if (convertNonCorrelatedSubQuery(subQuery, bb, converted.r, false)) {
return;
}
rel = convertToSingleValueSubq(query, converted.r);
subQuery.expr = bb.register(rel, JoinRelType.LEFT);
return;
case SELECT:
// This is used when converting multiset queries:
//
// select * from unnest(select multiset[deptno] from emps);
//
converted = convertExists(subQuery.node, RelOptUtil.SubQueryType.SCALAR,
subQuery.logic, true, null);
assert !converted.indicator;
subQuery.expr = bb.register(converted.r, JoinRelType.LEFT);
// This is used when converting window table functions:
//
// select * from table(tumble(table emps, descriptor(deptno), interval '3' DAY))
//
bb.cursors.add(converted.r);
return;
default:
throw new AssertionError("unexpected kind of sub-query: "
+ subQuery.node);
}
}
private RexNode translateIn(RelOptUtil.Logic logic, @Nullable RelNode root,
final RexNode rex) {
switch (logic) {
case TRUE:
return rexBuilder.makeLiteral(true);
case TRUE_FALSE:
case UNKNOWN_AS_FALSE:
assert rex instanceof RexRangeRef;
final int fieldCount = rex.getType().getFieldCount();
RexNode rexNode = rexBuilder.makeFieldAccess(rex, fieldCount - 1);
rexNode = rexBuilder.makeCall(SqlStdOperatorTable.IS_TRUE, rexNode);
// Then append the IS NOT NULL(leftKeysForIn).
//
// RexRangeRef contains the following fields:
// leftKeysForIn,
// rightKeysForIn (the original sub-query select list),
// nullIndicator
//
// The first two lists contain the same number of fields.
final int k = (fieldCount - 1) / 2;
for (int i = 0; i < k; i++) {
rexNode =
rexBuilder.makeCall(
SqlStdOperatorTable.AND,
rexNode,
rexBuilder.makeCall(
SqlStdOperatorTable.IS_NOT_NULL,
rexBuilder.makeFieldAccess(rex, i)));
}
return rexNode;
case TRUE_FALSE_UNKNOWN:
case UNKNOWN_AS_TRUE:
// select e.deptno,
// case
// when ct.c = 0 then false
// when dt.i is not null then true
// when e.deptno is null then null
// when ct.ck < ct.c then null
// else false
// end
// from e
// cross join (select count(*) as c, count(deptno) as ck from v) as ct
// left join (select distinct deptno, true as i from v) as dt
// on e.deptno = dt.deptno
final Join join = (Join) requireNonNull(root, "root");
final Project left = (Project) join.getLeft();
final RelNode leftLeft = ((Join) left.getInput()).getLeft();
final int leftLeftCount = leftLeft.getRowType().getFieldCount();
final RelDataType longType =
typeFactory.createSqlType(SqlTypeName.BIGINT);
final RexNode cRef = rexBuilder.makeInputRef(root, leftLeftCount);
final RexNode ckRef = rexBuilder.makeInputRef(root, leftLeftCount + 1);
final RexNode iRef =
rexBuilder.makeInputRef(root, root.getRowType().getFieldCount() - 1);
final RexLiteral zero =
rexBuilder.makeExactLiteral(BigDecimal.ZERO, longType);
final RexLiteral trueLiteral = rexBuilder.makeLiteral(true);
final RexLiteral falseLiteral = rexBuilder.makeLiteral(false);
final RexNode unknownLiteral =
rexBuilder.makeNullLiteral(trueLiteral.getType());
final ImmutableList.Builder<RexNode> args = ImmutableList.builder();
args.add(rexBuilder.makeCall(SqlStdOperatorTable.EQUALS, cRef, zero),
falseLiteral,
rexBuilder.makeCall(SqlStdOperatorTable.IS_NOT_NULL, iRef),
trueLiteral);
final JoinInfo joinInfo = join.analyzeCondition();
for (int leftKey : joinInfo.leftKeys) {
final RexNode kRef = rexBuilder.makeInputRef(root, leftKey);
args.add(rexBuilder.makeCall(SqlStdOperatorTable.IS_NULL, kRef),
unknownLiteral);
}
args.add(rexBuilder.makeCall(SqlStdOperatorTable.LESS_THAN, ckRef, cRef),
unknownLiteral,
falseLiteral);
return rexBuilder.makeCall(SqlStdOperatorTable.CASE, args.build());
default:
throw new AssertionError(logic);
}
}
/**
* Determines if a sub-query is non-correlated and if so, converts it to a
* constant.
*
* @param subQuery the call that references the sub-query
* @param bb blackboard used to convert the sub-query
* @param converted RelNode tree corresponding to the sub-query
* @param isExists true if the sub-query is part of an EXISTS expression
* @return Whether the sub-query can be converted to a constant
*/
private boolean convertNonCorrelatedSubQuery(
SubQuery subQuery,
Blackboard bb,
RelNode converted,
boolean isExists) {
SqlCall call = (SqlBasicCall) subQuery.node;
if (subQueryConverter.canConvertSubQuery()
&& isSubQueryNonCorrelated(converted, bb)) {
// First check if the sub-query has already been converted
// because it's a nested sub-query. If so, don't re-evaluate
// it again.
RexNode constExpr = mapConvertedNonCorrSubqs.get(call);
if (constExpr == null) {
constExpr =
subQueryConverter.convertSubQuery(
call,
this,
isExists,
config.isExplain());
}
if (constExpr != null) {
subQuery.expr = constExpr;
mapConvertedNonCorrSubqs.put(call, constExpr);
return true;
}
}
return false;
}
/**
* Converts the RelNode tree for a select statement to a select that
* produces a single value.
*
* @param query the query
* @param plan the original RelNode tree corresponding to the statement
* @return the converted RelNode tree
*/
public RelNode convertToSingleValueSubq(
SqlNode query,
RelNode plan) {
// Check whether query is guaranteed to produce a single value.
if (query instanceof SqlSelect) {
SqlSelect select = (SqlSelect) query;
SqlNodeList selectList = select.getSelectList();
SqlNodeList groupList = select.getGroup();
if ((selectList.size() == 1)
&& ((groupList == null) || (groupList.size() == 0))) {
SqlNode selectExpr = selectList.get(0);
if (selectExpr instanceof SqlCall) {
SqlCall selectExprCall = (SqlCall) selectExpr;
if (Util.isSingleValue(selectExprCall)) {
return plan;
}
}
// If there is a limit with 0 or 1,
// it is ensured to produce a single value
SqlNode fetch = select.getFetch();
if (fetch instanceof SqlNumericLiteral) {
long value = ((SqlNumericLiteral) fetch).getValueAs(Long.class);
if (value < 2) {
return plan;
}
}
}
} else if (query instanceof SqlCall) {
// If the query is (values ...),
// it is necessary to look into the operands to determine
// whether SingleValueAgg is necessary
SqlCall exprCall = (SqlCall) query;
if (exprCall.getOperator()
instanceof SqlValuesOperator
&& Util.isSingleValue(exprCall)) {
return plan;
}
}
// If not, project SingleValueAgg
return RelOptUtil.createSingleValueAggRel(
cluster,
plan);
}
/**
* Converts "x IN (1, 2, ...)" to "x=1 OR x=2 OR ...".
*
* @param leftKeys LHS
* @param valuesList RHS
* @param op The operator (IN, NOT IN, &gt; SOME, ...)
* @return converted expression
*/
private @Nullable RexNode convertInToOr(
final Blackboard bb,
final List<RexNode> leftKeys,
SqlNodeList valuesList,
SqlInOperator op) {
final List<RexNode> comparisons = new ArrayList<>();
for (SqlNode rightVals : valuesList) {
RexNode rexComparison;
final SqlOperator comparisonOp;
if (op instanceof SqlQuantifyOperator) {
comparisonOp = RelOptUtil.op(((SqlQuantifyOperator) op).comparisonKind,
SqlStdOperatorTable.EQUALS);
} else {
comparisonOp = SqlStdOperatorTable.EQUALS;
}
if (leftKeys.size() == 1) {
rexComparison =
rexBuilder.makeCall(comparisonOp,
leftKeys.get(0),
ensureSqlType(leftKeys.get(0).getType(),
bb.convertExpression(rightVals)));
} else {
assert rightVals instanceof SqlCall;
final SqlBasicCall call = (SqlBasicCall) rightVals;
assert (call.getOperator() instanceof SqlRowOperator)
&& call.operandCount() == leftKeys.size();
rexComparison =
RexUtil.composeConjunction(rexBuilder,
Util.transform(
Pair.zip(leftKeys, call.getOperandList()),
pair -> rexBuilder.makeCall(comparisonOp, pair.left,
// TODO: remove requireNonNull when checkerframework issue resolved
ensureSqlType(requireNonNull(pair.left, "pair.left").getType(),
bb.convertExpression(pair.right)))));
}
comparisons.add(rexComparison);
}
switch (op.kind) {
case ALL:
return RexUtil.composeConjunction(rexBuilder, comparisons, true);
case NOT_IN:
return rexBuilder.makeCall(SqlStdOperatorTable.NOT,
RexUtil.composeDisjunction(rexBuilder, comparisons));
case IN:
case SOME:
return RexUtil.composeDisjunction(rexBuilder, comparisons, true);
default:
throw new AssertionError();
}
}
/** Ensures that an expression has a given {@link SqlTypeName}, applying a
* cast if necessary. If the expression already has the right type family,
* returns the expression unchanged. */
private RexNode ensureSqlType(RelDataType type, RexNode node) {
if (type.getSqlTypeName() == node.getType().getSqlTypeName()
|| (type.getSqlTypeName() == SqlTypeName.VARCHAR
&& node.getType().getSqlTypeName() == SqlTypeName.CHAR)) {
return node;
}
return rexBuilder.ensureType(type, node, true);
}
/**
* Gets the list size threshold under which {@link #convertInToOr} is used.
* Lists of this size or greater will instead be converted to use a join
* against an inline table
* ({@link org.apache.calcite.rel.logical.LogicalValues}) rather than a
* predicate. A threshold of 0 forces usage of an inline table in all cases; a
* threshold of Integer.MAX_VALUE forces usage of OR in all cases
*
* @return threshold, default {@link #DEFAULT_IN_SUB_QUERY_THRESHOLD}
*/
@Deprecated // to be removed before 2.0
protected int getInSubqueryThreshold() {
return config.getInSubQueryThreshold();
}
/**
* Converts an EXISTS or IN predicate into a join. For EXISTS, the sub-query
* produces an indicator variable, and the result is a relational expression
* which outer joins that indicator to the original query. After performing
* the outer join, the condition will be TRUE if the EXISTS condition holds,
* NULL otherwise.
*
* @param seek A query, for example 'select * from emp' or
* 'values (1,2,3)' or '('Foo', 34)'.
* @param subQueryType Whether sub-query is IN, EXISTS or scalar
* @param logic Whether the answer needs to be in full 3-valued logic (TRUE,
* FALSE, UNKNOWN) will be required, or whether we can accept an
* approximation (say representing UNKNOWN as FALSE)
* @param notIn Whether the operation is NOT IN
* @return join expression
*/
private RelOptUtil.Exists convertExists(
SqlNode seek,
RelOptUtil.SubQueryType subQueryType,
RelOptUtil.Logic logic,
boolean notIn,
@Nullable RelDataType targetDataType) {
final SqlValidatorScope seekScope =
(seek instanceof SqlSelect)
? validator().getSelectScope((SqlSelect) seek)
: null;
final Blackboard seekBb = createBlackboard(seekScope, null, false);
RelNode seekRel = convertQueryOrInList(seekBb, seek, targetDataType);
requireNonNull(seekRel, () -> "seekRel is null for query " + seek);
return RelOptUtil.createExistsPlan(seekRel,
subQueryType, logic, notIn, relBuilder);
}
private @Nullable RelNode convertQueryOrInList(
Blackboard bb,
SqlNode seek,
@Nullable RelDataType targetRowType) {
// NOTE: Once we start accepting single-row queries as row constructors,
// there will be an ambiguity here for a case like X IN ((SELECT Y FROM
// Z)). The SQL standard resolves the ambiguity by saying that a lone
// select should be interpreted as a table expression, not a row
// expression. The semantic difference is that a table expression can
// return multiple rows.
if (seek instanceof SqlNodeList) {
return convertRowValues(
bb,
seek,
(SqlNodeList) seek,
false,
targetRowType);
} else {
return convertQueryRecursive(seek, false, null).project();
}
}
private @Nullable RelNode convertRowValues(
Blackboard bb,
SqlNode rowList,
Collection<SqlNode> rows,
boolean allowLiteralsOnly,
@Nullable RelDataType targetRowType) {
// NOTE jvs 30-Apr-2006: We combine all rows consisting entirely of
// literals into a single LogicalValues; this gives the optimizer a smaller
// input tree. For everything else (computed expressions, row
// sub-queries), we union each row in as a projection on top of a
// LogicalOneRow.
final ImmutableList.Builder<ImmutableList<RexLiteral>> tupleList =
ImmutableList.builder();
final RelDataType rowType;
if (targetRowType != null) {
rowType = targetRowType;
} else {
rowType =
SqlTypeUtil.promoteToRowType(
typeFactory,
validator().getValidatedNodeType(rowList),
null);
}
final List<RelNode> unionInputs = new ArrayList<>();
for (SqlNode node : rows) {
SqlBasicCall call;
if (isRowConstructor(node)) {
call = (SqlBasicCall) node;
ImmutableList.Builder<RexLiteral> tuple = ImmutableList.builder();
for (Ord<@Nullable SqlNode> operand : Ord.zip(call.operands)) {
RexLiteral rexLiteral =
convertLiteralInValuesList(
operand.e,
bb,
rowType,
operand.i);
if ((rexLiteral == null) && allowLiteralsOnly) {
return null;
}
if ((rexLiteral == null) || !config.isCreateValuesRel()) {
// fallback to convertRowConstructor
tuple = null;
break;
}
tuple.add(rexLiteral);
}
if (tuple != null) {
tupleList.add(tuple.build());
continue;
}
} else {
RexLiteral rexLiteral =
convertLiteralInValuesList(
node,
bb,
rowType,
0);
if ((rexLiteral != null) && config.isCreateValuesRel()) {
tupleList.add(ImmutableList.of(rexLiteral));
continue;
} else {
if ((rexLiteral == null) && allowLiteralsOnly) {
return null;
}
}
// convert "1" to "row(1)"
call =
(SqlBasicCall) SqlStdOperatorTable.ROW.createCall(
SqlParserPos.ZERO,
node);
}
unionInputs.add(convertRowConstructor(bb, call));
}
LogicalValues values =
LogicalValues.create(cluster, rowType, tupleList.build());
RelNode resultRel;
if (unionInputs.isEmpty()) {
resultRel = values;
} else {
if (!values.getTuples().isEmpty()) {
unionInputs.add(values);
}
resultRel = LogicalUnion.create(unionInputs, true);
}
leaves.put(resultRel, resultRel.getRowType().getFieldCount());
return resultRel;
}
private @Nullable RexLiteral convertLiteralInValuesList(
@Nullable SqlNode sqlNode,
Blackboard bb,
RelDataType rowType,
int iField) {
if (!(sqlNode instanceof SqlLiteral)) {
return null;
}
RelDataTypeField field = rowType.getFieldList().get(iField);
RelDataType type = field.getType();
if (type.isStruct()) {
// null literals for weird stuff like UDT's need
// special handling during type flattening, so
// don't use LogicalValues for those
return null;
}
return convertLiteral((SqlLiteral) sqlNode, bb, type);
}
private RexLiteral convertLiteral(SqlLiteral sqlLiteral,
Blackboard bb, RelDataType type) {
RexNode literalExpr = exprConverter.convertLiteral(bb, sqlLiteral);
if (!(literalExpr instanceof RexLiteral)) {
assert literalExpr.isA(SqlKind.CAST);
RexNode child = ((RexCall) literalExpr).getOperands().get(0);
assert RexLiteral.isNullLiteral(child);
// NOTE jvs 22-Nov-2006: we preserve type info
// in LogicalValues digest, so it's OK to lose it here
return (RexLiteral) child;
}
RexLiteral literal = (RexLiteral) literalExpr;
Comparable value = literal.getValue();
if (SqlTypeUtil.isExactNumeric(type) && SqlTypeUtil.hasScale(type)) {
BigDecimal roundedValue =
NumberUtil.rescaleBigDecimal(
(BigDecimal) value,
type.getScale());
return rexBuilder.makeExactLiteral(
roundedValue,
type);
}
if ((value instanceof NlsString)
&& (type.getSqlTypeName() == SqlTypeName.CHAR)) {
// pad fixed character type
NlsString unpadded = (NlsString) value;
return rexBuilder.makeCharLiteral(
new NlsString(
Spaces.padRight(unpadded.getValue(), type.getPrecision()),
unpadded.getCharsetName(),
unpadded.getCollation()));
}
return literal;
}
private static boolean isRowConstructor(SqlNode node) {
if (!(node.getKind() == SqlKind.ROW)) {
return false;
}
SqlCall call = (SqlCall) node;
return call.getOperator().getName().equalsIgnoreCase("row");
}
/**
* Builds a list of all <code>IN</code> or <code>EXISTS</code> operators
* inside SQL parse tree. Does not traverse inside queries.
*
* @param bb blackboard
* @param node the SQL parse tree
* @param logic Whether the answer needs to be in full 3-valued logic (TRUE,
* FALSE, UNKNOWN) will be required, or whether we can accept
* an approximation (say representing UNKNOWN as FALSE)
* @param registerOnlyScalarSubQueries if set to true and the parse tree
* corresponds to a variation of a select
* node, only register it if it's a scalar
* sub-query
*/
private void findSubQueries(
Blackboard bb,
SqlNode node,
RelOptUtil.Logic logic,
boolean registerOnlyScalarSubQueries) {
final SqlKind kind = node.getKind();
switch (kind) {
case EXISTS:
case UNIQUE:
case SELECT:
case MULTISET_QUERY_CONSTRUCTOR:
case MULTISET_VALUE_CONSTRUCTOR:
case ARRAY_QUERY_CONSTRUCTOR:
case CURSOR:
case SCALAR_QUERY:
if (!registerOnlyScalarSubQueries
|| (kind == SqlKind.SCALAR_QUERY)) {
bb.registerSubQuery(node, RelOptUtil.Logic.TRUE_FALSE);
}
return;
case IN:
break;
case NOT_IN:
case NOT:
logic = logic.negate();
break;
default:
break;
}
if (node instanceof SqlCall) {
switch (kind) {
// Do no change logic for AND, IN and NOT IN expressions;
// but do change logic for OR, NOT and others;
// EXISTS was handled already.
case AND:
case IN:
case NOT_IN:
break;
default:
logic = RelOptUtil.Logic.TRUE_FALSE_UNKNOWN;
break;
}
for (SqlNode operand : ((SqlCall) node).getOperandList()) {
if (operand != null) {
// In the case of an IN expression, locate scalar
// sub-queries so we can convert them to constants
findSubQueries(bb, operand, logic,
kind == SqlKind.IN || kind == SqlKind.NOT_IN
|| kind == SqlKind.SOME || kind == SqlKind.ALL
|| registerOnlyScalarSubQueries);
}
}
} else if (node instanceof SqlNodeList) {
for (SqlNode child : (SqlNodeList) node) {
findSubQueries(bb, child, logic,
kind == SqlKind.IN || kind == SqlKind.NOT_IN
|| kind == SqlKind.SOME || kind == SqlKind.ALL
|| registerOnlyScalarSubQueries);
}
}
// Now that we've located any scalar sub-queries inside the IN
// expression, register the IN expression itself. We need to
// register the scalar sub-queries first so they can be converted
// before the IN expression is converted.
switch (kind) {
case IN:
case NOT_IN:
case SOME:
case ALL:
switch (logic) {
case TRUE_FALSE_UNKNOWN:
RelDataType type = validator().getValidatedNodeTypeIfKnown(node);
if (type == null) {
// The node might not be validated if we still don't know type of the node.
// Therefore return directly.
return;
} else {
break;
}
case UNKNOWN_AS_FALSE:
logic = RelOptUtil.Logic.TRUE;
break;
default:
break;
}
bb.registerSubQuery(node, logic);
break;
default:
break;
}
}
/**
* Converts an expression from {@link SqlNode} to {@link RexNode} format.
*
* @param node Expression to translate
* @return Converted expression
*/
public RexNode convertExpression(
SqlNode node) {
Map<String, RelDataType> nameToTypeMap = Collections.emptyMap();
final ParameterScope scope =
new ParameterScope((SqlValidatorImpl) validator(), nameToTypeMap);
final Blackboard bb = createBlackboard(scope, null, false);
replaceSubQueries(bb, node, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
return bb.convertExpression(node);
}
/**
* Converts an expression from {@link SqlNode} to {@link RexNode} format,
* mapping identifier references to predefined expressions.
*
* @param node Expression to translate
* @param nameToNodeMap map from String to {@link RexNode}; when an
* {@link SqlIdentifier} is encountered, it is used as a
* key and translated to the corresponding value from
* this map
* @return Converted expression
*/
public RexNode convertExpression(
SqlNode node,
Map<String, RexNode> nameToNodeMap) {
final Map<String, RelDataType> nameToTypeMap = new HashMap<>();
for (Map.Entry<String, RexNode> entry : nameToNodeMap.entrySet()) {
nameToTypeMap.put(entry.getKey(), entry.getValue().getType());
}
final ParameterScope scope =
new ParameterScope((SqlValidatorImpl) validator(), nameToTypeMap);
final Blackboard bb = createBlackboard(scope, nameToNodeMap, false);
replaceSubQueries(bb, node, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
return bb.convertExpression(node);
}
/**
* Converts a non-standard expression.
*
* <p>This method is an extension-point that derived classes can override. If
* this method returns a null result, the normal expression translation
* process will proceed. The default implementation always returns null.
*
* @param node Expression
* @param bb Blackboard
* @return null to proceed with the usual expression translation process
*/
protected @Nullable RexNode convertExtendedExpression(
SqlNode node,
Blackboard bb) {
return null;
}
private RexNode convertOver(Blackboard bb, SqlNode node) {
SqlCall call = (SqlCall) node;
SqlCall aggCall = call.operand(0);
boolean ignoreNulls = false;
switch (aggCall.getKind()) {
case IGNORE_NULLS:
ignoreNulls = true;
// fall through
case RESPECT_NULLS:
aggCall = aggCall.operand(0);
break;
default:
break;
}
SqlNode windowOrRef = call.operand(1);
final SqlWindow window =
validator().resolveWindow(windowOrRef, bb.scope());
SqlNode sqlLowerBound = window.getLowerBound();
SqlNode sqlUpperBound = window.getUpperBound();
boolean rows = window.isRows();
SqlNodeList orderList = window.getOrderList();
if (!aggCall.getOperator().allowsFraming()) {
// If the operator does not allow framing, bracketing is implicitly
// everything up to the current row.
sqlLowerBound = SqlWindow.createUnboundedPreceding(SqlParserPos.ZERO);
sqlUpperBound = SqlWindow.createCurrentRow(SqlParserPos.ZERO);
if (aggCall.getKind() == SqlKind.ROW_NUMBER) {
// ROW_NUMBER() expects specific kind of framing.
rows = true;
}
} else if (orderList.size() == 0) {
// Without ORDER BY, there must be no bracketing.
sqlLowerBound = SqlWindow.createUnboundedPreceding(SqlParserPos.ZERO);
sqlUpperBound = SqlWindow.createUnboundedFollowing(SqlParserPos.ZERO);
} else if (sqlLowerBound == null && sqlUpperBound == null) {
sqlLowerBound = SqlWindow.createUnboundedPreceding(SqlParserPos.ZERO);
sqlUpperBound = SqlWindow.createCurrentRow(SqlParserPos.ZERO);
} else if (sqlUpperBound == null) {
sqlUpperBound = SqlWindow.createCurrentRow(SqlParserPos.ZERO);
} else if (sqlLowerBound == null) {
sqlLowerBound = SqlWindow.createCurrentRow(SqlParserPos.ZERO);
}
final SqlNodeList partitionList = window.getPartitionList();
final ImmutableList.Builder<RexNode> partitionKeys =
ImmutableList.builder();
for (SqlNode partition : partitionList) {
validator().deriveType(bb.scope(), partition);
partitionKeys.add(bb.convertExpression(partition));
}
final RexNode lowerBound = bb.convertExpression(
requireNonNull(sqlLowerBound, "sqlLowerBound"));
final RexNode upperBound = bb.convertExpression(
requireNonNull(sqlUpperBound, "sqlUpperBound"));
if (orderList.size() == 0 && !rows) {
// A logical range requires an ORDER BY clause. Use the implicit
// ordering of this relation. There must be one, otherwise it would
// have failed validation.
orderList = bb.scope().getOrderList();
if (orderList == null) {
throw new AssertionError(
"Relation should have sort key for implicit ORDER BY");
}
}
final ImmutableList.Builder<RexNode> orderKeys =
ImmutableList.builder();
for (SqlNode order : orderList) {
orderKeys.add(
bb.convertSortExpression(order,
RelFieldCollation.Direction.ASCENDING,
RelFieldCollation.NullDirection.UNSPECIFIED,
bb::sortToRex));
}
try {
Preconditions.checkArgument(bb.window == null,
"already in window agg mode");
bb.window = window;
RexNode rexAgg = exprConverter.convertCall(bb, aggCall);
rexAgg =
rexBuilder.ensureType(
validator().getValidatedNodeType(call), rexAgg, false);
// Walk over the tree and apply 'over' to all agg functions. This is
// necessary because the returned expression is not necessarily a call
// to an agg function. For example, AVG(x) becomes SUM(x) / COUNT(x).
final SqlLiteral q = aggCall.getFunctionQuantifier();
final boolean isDistinct = q != null
&& q.getValue() == SqlSelectKeyword.DISTINCT;
final RexShuttle visitor =
new HistogramShuttle(partitionKeys.build(), orderKeys.build(), rows,
RexWindowBounds.create(sqlLowerBound, lowerBound),
RexWindowBounds.create(sqlUpperBound, upperBound),
window.isAllowPartial(), isDistinct, ignoreNulls);
return rexAgg.accept(visitor);
} finally {
bb.window = null;
}
}
protected void convertFrom(
Blackboard bb,
@Nullable SqlNode from) {
convertFrom(bb, from, Collections.emptyList());
}
/**
* Converts a FROM clause into a relational expression.
*
* @param bb Scope within which to resolve identifiers
* @param from FROM clause of a query. Examples include:
*
* <ul>
* <li>a single table ("SALES.EMP"),
* <li>an aliased table ("EMP AS E"),
* <li>a list of tables ("EMP, DEPT"),
* <li>an ANSI Join expression ("EMP JOIN DEPT ON EMP.DEPTNO =
* DEPT.DEPTNO"),
* <li>a VALUES clause ("VALUES ('Fred', 20)"),
* <li>a query ("(SELECT * FROM EMP WHERE GENDER = 'F')"),
* <li>or any combination of the above.
* </ul>
* @param fieldNames Field aliases, usually come from AS clause, or null
*/
protected void convertFrom(
Blackboard bb,
@Nullable SqlNode from,
@Nullable List<String> fieldNames) {
if (from == null) {
bb.setRoot(LogicalValues.createOneRow(cluster), false);
return;
}
final SqlCall call;
final @Nullable SqlNode[] operands;
switch (from.getKind()) {
case AS:
call = (SqlCall) from;
SqlNode firstOperand = call.operand(0);
final List<String> fieldNameList = call.operandCount() > 2
? SqlIdentifier.simpleNames(Util.skip(call.getOperandList(), 2))
: null;
convertFrom(bb, firstOperand, fieldNameList);
return;
case MATCH_RECOGNIZE:
convertMatchRecognize(bb, (SqlMatchRecognize) from);
return;
case PIVOT:
convertPivot(bb, (SqlPivot) from);
return;
case UNPIVOT:
convertUnpivot(bb, (SqlUnpivot) from);
return;
case WITH_ITEM:
convertFrom(bb, ((SqlWithItem) from).query);
return;
case WITH:
convertFrom(bb, ((SqlWith) from).body);
return;
case TABLESAMPLE:
operands = ((SqlBasicCall) from).getOperands();
SqlSampleSpec sampleSpec = SqlLiteral.sampleValue(
requireNonNull(operands[1], () -> "operand[1] of " + from));
if (sampleSpec instanceof SqlSampleSpec.SqlSubstitutionSampleSpec) {
String sampleName =
((SqlSampleSpec.SqlSubstitutionSampleSpec) sampleSpec)
.getName();
datasetStack.push(sampleName);
convertFrom(bb, operands[0]);
datasetStack.pop();
} else if (sampleSpec instanceof SqlSampleSpec.SqlTableSampleSpec) {
SqlSampleSpec.SqlTableSampleSpec tableSampleSpec =
(SqlSampleSpec.SqlTableSampleSpec) sampleSpec;
convertFrom(bb, operands[0]);
RelOptSamplingParameters params =
new RelOptSamplingParameters(
tableSampleSpec.isBernoulli(),
tableSampleSpec.getSamplePercentage(),
tableSampleSpec.isRepeatable(),
tableSampleSpec.getRepeatableSeed());
bb.setRoot(new Sample(cluster, bb.root(), params), false);
} else {
throw new AssertionError("unknown TABLESAMPLE type: " + sampleSpec);
}
return;
case TABLE_REF:
call = (SqlCall) from;
convertIdentifier(bb, call.operand(0), null, call.operand(1));
return;
case IDENTIFIER:
convertIdentifier(bb, (SqlIdentifier) from, null, null);
return;
case EXTEND:
call = (SqlCall) from;
final SqlNode operand0 = call.getOperandList().get(0);
final SqlIdentifier id = operand0.getKind() == SqlKind.TABLE_REF
? ((SqlCall) operand0).operand(0)
: (SqlIdentifier) operand0;
SqlNodeList extendedColumns = (SqlNodeList) call.getOperandList().get(1);
convertIdentifier(bb, id, extendedColumns, null);
return;
case SNAPSHOT:
convertTemporalTable(bb, (SqlCall) from);
return;
case JOIN:
convertJoin(bb, (SqlJoin) from);
return;
case SELECT:
case INTERSECT:
case EXCEPT:
case UNION:
final RelNode rel = convertQueryRecursive(from, false, null).project();
bb.setRoot(rel, true);
return;
case VALUES:
convertValuesImpl(bb, (SqlCall) from, null);
if (fieldNames != null) {
bb.setRoot(relBuilder.push(bb.root()).rename(fieldNames).build(), true);
}
return;
case UNNEST:
convertUnnest(bb, (SqlCall) from, fieldNames);
return;
case COLLECTION_TABLE:
call = (SqlCall) from;
// Dig out real call; TABLE() wrapper is just syntactic.
assert call.getOperandList().size() == 1;
final SqlCall call2 = call.operand(0);
convertCollectionTable(bb, call2);
return;
default:
throw new AssertionError("not a join operator " + from);
}
}
private void convertUnnest(Blackboard bb, SqlCall call, @Nullable List<String> fieldNames) {
final List<SqlNode> nodes = call.getOperandList();
final SqlUnnestOperator operator = (SqlUnnestOperator) call.getOperator();
for (SqlNode node : nodes) {
replaceSubQueries(bb, node, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
}
final List<RexNode> exprs = new ArrayList<>();
for (Ord<SqlNode> node : Ord.zip(nodes)) {
exprs.add(
relBuilder.alias(bb.convertExpression(node.e), validator().deriveAlias(node.e, node.i)));
}
RelNode child =
(null != bb.root) ? bb.root : LogicalValues.createOneRow(cluster);
RelNode uncollect;
if (validator().config().sqlConformance().allowAliasUnnestItems()) {
uncollect = relBuilder
.push(child)
.project(exprs)
.uncollect(requireNonNull(fieldNames, "fieldNames"), operator.withOrdinality)
.build();
} else {
// REVIEW danny 2020-04-26: should we unify the normal field aliases and
// the item aliases?
uncollect = relBuilder
.push(child)
.project(exprs)
.uncollect(Collections.emptyList(), operator.withOrdinality)
.let(r -> fieldNames == null ? r : r.rename(fieldNames))
.build();
}
bb.setRoot(uncollect, true);
}
protected void convertMatchRecognize(Blackboard bb,
SqlMatchRecognize matchRecognize) {
final SqlValidatorNamespace ns = getNamespace(matchRecognize);
final SqlValidatorScope scope = validator().getMatchRecognizeScope(matchRecognize);
final Blackboard matchBb = createBlackboard(scope, null, false);
final RelDataType rowType = ns.getRowType();
// convert inner query, could be a table name or a derived table
SqlNode expr = matchRecognize.getTableRef();
convertFrom(matchBb, expr);
final RelNode input = matchBb.root();
// PARTITION BY
final SqlNodeList partitionList = matchRecognize.getPartitionList();
final ImmutableBitSet.Builder partitionKeys = ImmutableBitSet.builder();
for (SqlNode partition : partitionList) {
RexNode e = matchBb.convertExpression(partition);
partitionKeys.set(((RexInputRef) e).getIndex());
}
// ORDER BY
final SqlNodeList orderList = matchRecognize.getOrderList();
final List<RelFieldCollation> orderKeys = new ArrayList<>();
for (SqlNode order : orderList) {
final RelFieldCollation.Direction direction;
switch (order.getKind()) {
case DESCENDING:
direction = RelFieldCollation.Direction.DESCENDING;
order = ((SqlCall) order).operand(0);
break;
case NULLS_FIRST:
case NULLS_LAST:
throw new AssertionError();
default:
direction = RelFieldCollation.Direction.ASCENDING;
break;
}
final RelFieldCollation.NullDirection nullDirection =
validator().config().defaultNullCollation().last(desc(direction))
? RelFieldCollation.NullDirection.LAST
: RelFieldCollation.NullDirection.FIRST;
RexNode e = matchBb.convertExpression(order);
orderKeys.add(
new RelFieldCollation(((RexInputRef) e).getIndex(), direction,
nullDirection));
}
final RelCollation orders = cluster.traitSet().canonize(RelCollations.of(orderKeys));
// convert pattern
final Set<String> patternVarsSet = new HashSet<>();
SqlNode pattern = matchRecognize.getPattern();
final SqlBasicVisitor<@Nullable RexNode> patternVarVisitor =
new SqlBasicVisitor<@Nullable RexNode>() {
@Override public RexNode visit(SqlCall call) {
List<SqlNode> operands = call.getOperandList();
List<RexNode> newOperands = new ArrayList<>();
for (SqlNode node : operands) {
RexNode arg = requireNonNull(node.accept(this), node::toString);
newOperands.add(arg);
}
return rexBuilder.makeCall(
validator().getUnknownType(), call.getOperator(), newOperands);
}
@Override public RexNode visit(SqlIdentifier id) {
assert id.isSimple();
patternVarsSet.add(id.getSimple());
return rexBuilder.makeLiteral(id.getSimple());
}
@Override public RexNode visit(SqlLiteral literal) {
if (literal instanceof SqlNumericLiteral) {
return rexBuilder.makeExactLiteral(BigDecimal.valueOf(literal.intValue(true)));
} else {
return rexBuilder.makeLiteral(literal.booleanValue());
}
}
};
final RexNode patternNode = pattern.accept(patternVarVisitor);
assert patternNode != null : "pattern is not found in " + pattern;
SqlLiteral interval = matchRecognize.getInterval();
RexNode intervalNode = null;
if (interval != null) {
intervalNode = matchBb.convertLiteral(interval);
}
// convert subset
final SqlNodeList subsets = matchRecognize.getSubsetList();
final Map<String, TreeSet<String>> subsetMap = new HashMap<>();
for (SqlNode node : subsets) {
List<SqlNode> operands = ((SqlCall) node).getOperandList();
SqlIdentifier left = (SqlIdentifier) operands.get(0);
patternVarsSet.add(left.getSimple());
final SqlNodeList rights = (SqlNodeList) operands.get(1);
final TreeSet<String> list =
new TreeSet<>(SqlIdentifier.simpleNames(rights));
subsetMap.put(left.getSimple(), list);
}
SqlNode afterMatch = matchRecognize.getAfter();
if (afterMatch == null) {
afterMatch =
SqlMatchRecognize.AfterOption.SKIP_TO_NEXT_ROW.symbol(SqlParserPos.ZERO);
}
final RexNode after;
if (afterMatch instanceof SqlCall) {
List<SqlNode> operands = ((SqlCall) afterMatch).getOperandList();
SqlOperator operator = ((SqlCall) afterMatch).getOperator();
assert operands.size() == 1;
SqlIdentifier id = (SqlIdentifier) operands.get(0);
assert patternVarsSet.contains(id.getSimple())
: id.getSimple() + " not defined in pattern";
RexNode rex = rexBuilder.makeLiteral(id.getSimple());
after =
rexBuilder.makeCall(validator().getUnknownType(), operator,
ImmutableList.of(rex));
} else {
after = matchBb.convertExpression(afterMatch);
}
matchBb.setPatternVarRef(true);
// convert measures
final ImmutableMap.Builder<String, RexNode> measureNodes =
ImmutableMap.builder();
for (SqlNode measure : matchRecognize.getMeasureList()) {
List<SqlNode> operands = ((SqlCall) measure).getOperandList();
String alias = ((SqlIdentifier) operands.get(1)).getSimple();
RexNode rex = matchBb.convertExpression(operands.get(0));
measureNodes.put(alias, rex);
}
// convert definitions
final ImmutableMap.Builder<String, RexNode> definitionNodes =
ImmutableMap.builder();
for (SqlNode def : matchRecognize.getPatternDefList()) {
replaceSubQueries(matchBb, def, RelOptUtil.Logic.UNKNOWN_AS_FALSE);
List<SqlNode> operands = ((SqlCall) def).getOperandList();
String alias = ((SqlIdentifier) operands.get(1)).getSimple();
RexNode rex = matchBb.convertExpression(operands.get(0));
definitionNodes.put(alias, rex);
}
final SqlLiteral rowsPerMatch = matchRecognize.getRowsPerMatch();
final boolean allRows = rowsPerMatch != null
&& rowsPerMatch.getValue() == SqlMatchRecognize.RowsPerMatchOption.ALL_ROWS;
matchBb.setPatternVarRef(false);
final RelFactories.MatchFactory factory =
RelFactories.DEFAULT_MATCH_FACTORY;
final RelNode rel =
factory.createMatch(input, patternNode,
rowType, matchRecognize.getStrictStart().booleanValue(),
matchRecognize.getStrictEnd().booleanValue(),
definitionNodes.build(), measureNodes.build(), after, subsetMap,
allRows, partitionKeys.build(), orders, intervalNode);
bb.setRoot(rel, false);
}
protected void convertPivot(Blackboard bb, SqlPivot pivot) {
final SqlValidatorScope scope = validator().getJoinScope(pivot);
final Blackboard pivotBb = createBlackboard(scope, null, false);
// Convert input
convertFrom(pivotBb, pivot.query);
final RelNode input = pivotBb.root();
final RelDataType inputRowType = input.getRowType();
relBuilder.push(input);
// Gather fields.
final AggConverter aggConverter =
new AggConverter(pivotBb, (AggregatingSelectScope) null);
final Set<String> usedColumnNames = pivot.usedColumnNames();
// 1. Gather group keys.
inputRowType.getFieldList().stream()
.filter(field -> !usedColumnNames.contains(field.getName()))
.forEach(field ->
aggConverter.addGroupExpr(
new SqlIdentifier(field.getName(), SqlParserPos.ZERO)));
// 2. Gather axes.
pivot.axisList.forEach(aggConverter::addGroupExpr);
// 3. Gather columns used as arguments to aggregate functions.
pivotBb.agg = aggConverter;
final List<@Nullable String> aggAliasList = new ArrayList<>();
assert aggConverter.aggCalls.size() == 0;
pivot.forEachAgg((alias, call) -> {
call.accept(aggConverter);
aggAliasList.add(alias);
assert aggConverter.aggCalls.size() == aggAliasList.size();
});
pivotBb.agg = null;
// Project the fields that we will need.
relBuilder
.project(Pair.left(aggConverter.getPreExprs()),
Pair.right(aggConverter.getPreExprs()));
// Build expressions.
// 1. Build group key
final RelBuilder.GroupKey groupKey =
relBuilder.groupKey(
inputRowType.getFieldList().stream()
.filter(field -> !usedColumnNames.contains(field.getName()))
.map(field ->
aggConverter.addGroupExpr(
new SqlIdentifier(field.getName(), SqlParserPos.ZERO)))
.collect(ImmutableBitSet.toImmutableBitSet()));
// 2. Build axes, for example
// FOR (axis1, axis2 ...) IN ...
final List<RexNode> axes = new ArrayList<>();
for (SqlNode axis : pivot.axisList) {
axes.add(relBuilder.field(aggConverter.addGroupExpr(axis)));
}
// 3. Build aggregate expressions, for example
// PIVOT (sum(a) AS alias1, min(b) AS alias2, ... FOR ... IN ...)
final List<RelBuilder.AggCall> aggCalls = new ArrayList<>();
Pair.forEach(aggAliasList, aggConverter.aggCalls, (alias, aggregateCall) ->
aggCalls.add(relBuilder.aggregateCall(aggregateCall).as(alias)));
// 4. Build values, for example
// IN ((v11, v12, ...) AS label1, (v21, v22, ...) AS label2, ...)
final ImmutableList.Builder<Pair<String, List<RexNode>>> valueList =
ImmutableList.builder();
pivot.forEachNameValues((alias, nodeList) ->
valueList.add(
Pair.of(alias,
nodeList.stream().map(bb::convertExpression)
.collect(Util.toImmutableList()))));
final RelNode rel =
relBuilder.pivot(groupKey, aggCalls, axes, valueList.build())
.build();
bb.setRoot(rel, true);
}
protected void convertUnpivot(Blackboard bb, SqlUnpivot unpivot) {
final SqlValidatorScope scope = validator().getJoinScope(unpivot);
final Blackboard unpivotBb = createBlackboard(scope, null, false);
// Convert input
convertFrom(unpivotBb, unpivot.query);
final RelNode input = unpivotBb.root();
relBuilder.push(input);
final List<String> measureNames = unpivot.measureList.stream()
.map(node -> ((SqlIdentifier) node).getSimple())
.collect(Util.toImmutableList());
final List<String> axisNames = unpivot.axisList.stream()
.map(node -> ((SqlIdentifier) node).getSimple())
.collect(Util.toImmutableList());
final ImmutableList.Builder<Pair<List<RexLiteral>, List<RexNode>>> axisMap =
ImmutableList.builder();
unpivot.forEachNameValues((nodeList, valueList) -> {
if (valueList == null) {
valueList = new SqlNodeList(
Collections.nCopies(axisNames.size(),
SqlLiteral.createCharString(SqlUnpivot.aliasValue(nodeList),
SqlParserPos.ZERO)),
SqlParserPos.ZERO);
}
final List<RexLiteral> literals = new ArrayList<>();
Pair.forEach(valueList, unpivot.axisList, (value, axis) -> {
final RelDataType type = validator().getValidatedNodeType(axis);
literals.add(convertLiteral((SqlLiteral) value, bb, type));
});
final List<RexNode> nodes = nodeList.stream()
.map(unpivotBb::convertExpression)
.collect(Util.toImmutableList());
axisMap.add(Pair.of(literals, nodes));
});
relBuilder.unpivot(unpivot.includeNulls, measureNames, axisNames,
axisMap.build());
relBuilder.convert(getNamespace(unpivot).getRowType(), false);
bb.setRoot(relBuilder.build(), true);
}
private void convertIdentifier(Blackboard bb, SqlIdentifier id,
@Nullable SqlNodeList extendedColumns, @Nullable SqlNodeList tableHints) {
final SqlValidatorNamespace fromNamespace = getNamespace(id).resolve();
if (fromNamespace.getNode() != null) {
convertFrom(bb, fromNamespace.getNode());
return;
}
final String datasetName =
datasetStack.isEmpty() ? null : datasetStack.peek();
final boolean[] usedDataset = {false};
RelOptTable table =
SqlValidatorUtil.getRelOptTable(fromNamespace, catalogReader,
datasetName, usedDataset);
assert table != null : "getRelOptTable returned null for " + fromNamespace;
if (extendedColumns != null && extendedColumns.size() > 0) {
final SqlValidatorTable validatorTable =
table.unwrapOrThrow(SqlValidatorTable.class);
final List<RelDataTypeField> extendedFields =
SqlValidatorUtil.getExtendedColumns(validator, validatorTable,
extendedColumns);
table = table.extend(extendedFields);
}
final RelNode tableRel;
// Review Danny 2020-01-13: hacky to construct a new table scan
// in order to apply the hint strategies.
final List<RelHint> hints = hintStrategies.apply(
SqlUtil.getRelHint(hintStrategies, tableHints),
LogicalTableScan.create(cluster, table, ImmutableList.of()));
tableRel = toRel(table, hints);
bb.setRoot(tableRel, true);
if (usedDataset[0]) {
bb.setDataset(datasetName);
}
}
protected void convertCollectionTable(
Blackboard bb,
SqlCall call) {
final SqlOperator operator = call.getOperator();
if (operator == SqlStdOperatorTable.TABLESAMPLE) {
final String sampleName =
SqlLiteral.unchain(call.operand(0)).getValueAs(String.class);
datasetStack.push(sampleName);
SqlCall cursorCall = call.operand(1);
SqlNode query = cursorCall.operand(0);
RelNode converted = convertQuery(query, false, false).rel;
bb.setRoot(converted, false);
datasetStack.pop();
return;
}
replaceSubQueries(bb, call, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
// Expand table macro if possible. It's more efficient than
// LogicalTableFunctionScan.
final SqlCallBinding callBinding =
new SqlCallBinding(bb.scope().getValidator(), bb.scope, call);
if (operator instanceof SqlUserDefinedTableMacro) {
final SqlUserDefinedTableMacro udf =
(SqlUserDefinedTableMacro) operator;
final TranslatableTable table = udf.getTable(callBinding);
final RelDataType rowType = table.getRowType(typeFactory);
RelOptTable relOptTable = RelOptTableImpl.create(null, rowType, table,
udf.getNameAsId().names);
RelNode converted = toRel(relOptTable, ImmutableList.of());
bb.setRoot(converted, true);
return;
}
Type elementType;
if (operator instanceof SqlUserDefinedTableFunction) {
SqlUserDefinedTableFunction udtf = (SqlUserDefinedTableFunction) operator;
elementType = udtf.getElementType(callBinding);
} else {
elementType = null;
}
RexNode rexCall = bb.convertExpression(call);
final List<RelNode> inputs = bb.retrieveCursors();
Set<RelColumnMapping> columnMappings =
getColumnMappings(operator);
LogicalTableFunctionScan callRel =
LogicalTableFunctionScan.create(
cluster,
inputs,
rexCall,
elementType,
validator().getValidatedNodeType(call),
columnMappings);
final SqlValidatorScope selectScope =
((DelegatingScope) bb.scope()).getParent();
final Blackboard seekBb = createBlackboard(selectScope, null, false);
final CorrelationUse p = getCorrelationUse(seekBb, callRel);
if (p != null) {
assert p.r instanceof LogicalTableFunctionScan;
callRel = (LogicalTableFunctionScan) p.r;
}
bb.setRoot(callRel, true);
afterTableFunction(bb, call, callRel);
}
protected void afterTableFunction(
SqlToRelConverter.Blackboard bb,
SqlCall call,
LogicalTableFunctionScan callRel) {
}
private void convertTemporalTable(Blackboard bb, SqlCall call) {
final SqlSnapshot snapshot = (SqlSnapshot) call;
final RexNode period = bb.convertExpression(snapshot.getPeriod());
// convert inner query, could be a table name or a derived table
SqlNode expr = snapshot.getTableRef();
convertFrom(bb, expr);
final RelNode snapshotRel = relBuilder.push(bb.root()).snapshot(period).build();
bb.setRoot(snapshotRel, false);
}
private static @Nullable Set<RelColumnMapping> getColumnMappings(SqlOperator op) {
SqlReturnTypeInference rti = op.getReturnTypeInference();
if (rti == null) {
return null;
}
if (rti instanceof TableFunctionReturnTypeInference) {
TableFunctionReturnTypeInference tfrti =
(TableFunctionReturnTypeInference) rti;
return tfrti.getColumnMappings();
} else {
return null;
}
}
/** Shuttle that replace outer {@link RexInputRef} with
* {@link RexFieldAccess}, and adjust {@code offset} to
* each inner {@link RexInputRef} in the lateral join
* condition. */
private static class RexAccessShuttle extends RexShuttle {
private final RexBuilder builder;
private final RexCorrelVariable rexCorrel;
private final BitSet varCols = new BitSet();
RexAccessShuttle(RexBuilder builder, RexCorrelVariable rexCorrel) {
this.builder = builder;
this.rexCorrel = rexCorrel;
}
@Override public RexNode visitInputRef(RexInputRef input) {
int i = input.getIndex() - rexCorrel.getType().getFieldCount();
if (i < 0) {
varCols.set(input.getIndex());
return builder.makeFieldAccess(rexCorrel, input.getIndex());
}
return builder.makeInputRef(input.getType(), i);
}
}
protected RelNode createJoin(
Blackboard bb,
RelNode leftRel,
RelNode rightRel,
RexNode joinCond,
JoinRelType joinType) {
assert joinCond != null;
final CorrelationUse p = getCorrelationUse(bb, rightRel);
if (p != null) {
RelNode innerRel = p.r;
ImmutableBitSet requiredCols = p.requiredColumns;
if (!joinCond.isAlwaysTrue()) {
final RelFactories.FilterFactory factory =
RelFactories.DEFAULT_FILTER_FACTORY;
final RexCorrelVariable rexCorrel =
(RexCorrelVariable) rexBuilder.makeCorrel(
leftRel.getRowType(), p.id);
final RexAccessShuttle shuttle =
new RexAccessShuttle(rexBuilder, rexCorrel);
// Replace outer RexInputRef with RexFieldAccess,
// and push lateral join predicate into inner child
final RexNode newCond = joinCond.accept(shuttle);
innerRel = factory.createFilter(p.r, newCond, ImmutableSet.of());
requiredCols = ImmutableBitSet
.fromBitSet(shuttle.varCols)
.union(p.requiredColumns);
}
return LogicalCorrelate.create(leftRel, innerRel,
p.id, requiredCols, joinType);
}
final RelNode node =
relBuilder.push(leftRel)
.push(rightRel)
.join(joinType, joinCond)
.build();
// If join conditions are pushed down, update the leaves.
if (node instanceof Project) {
final Join newJoin = (Join) node.getInputs().get(0);
if (leaves.containsKey(leftRel)) {
leaves.put(newJoin.getLeft(), leaves.get(leftRel));
}
if (leaves.containsKey(rightRel)) {
leaves.put(newJoin.getRight(), leaves.get(rightRel));
}
}
return node;
}
private @Nullable CorrelationUse getCorrelationUse(Blackboard bb, final RelNode r0) {
final Set<CorrelationId> correlatedVariables =
RelOptUtil.getVariablesUsed(r0);
if (correlatedVariables.isEmpty()) {
return null;
}
final ImmutableBitSet.Builder requiredColumns = ImmutableBitSet.builder();
final List<CorrelationId> correlNames = new ArrayList<>();
// All correlations must refer the same namespace since correlation
// produces exactly one correlation source.
// The same source might be referenced by different variables since
// DeferredLookups are not de-duplicated at create time.
SqlValidatorNamespace prevNs = null;
for (CorrelationId correlName : correlatedVariables) {
DeferredLookup lookup = requireNonNull(
mapCorrelToDeferred.get(correlName),
() -> "correlation variable is not found: " + correlName);
RexFieldAccess fieldAccess = lookup.getFieldAccess(correlName);
String originalRelName = lookup.getOriginalRelName();
String originalFieldName = fieldAccess.getField().getName();
final SqlNameMatcher nameMatcher =
bb.getValidator().getCatalogReader().nameMatcher();
final SqlValidatorScope.ResolvedImpl resolved =
new SqlValidatorScope.ResolvedImpl();
lookup.bb.scope().resolve(ImmutableList.of(originalRelName),
nameMatcher, false, resolved);
assert resolved.count() == 1;
final SqlValidatorScope.Resolve resolve = resolved.only();
final SqlValidatorNamespace foundNs = resolve.namespace;
final RelDataType rowType = resolve.rowType();
final int childNamespaceIndex = resolve.path.steps().get(0).i;
final SqlValidatorScope ancestorScope = resolve.scope;
boolean correlInCurrentScope = bb.scope().isWithin(ancestorScope);
if (!correlInCurrentScope) {
continue;
}
if (prevNs == null) {
prevNs = foundNs;
} else {
assert prevNs == foundNs : "All correlation variables should resolve"
+ " to the same namespace."
+ " Prev ns=" + prevNs
+ ", new ns=" + foundNs;
}
int namespaceOffset = 0;
if (childNamespaceIndex > 0) {
// If not the first child, need to figure out the width
// of output types from all the preceding namespaces
assert ancestorScope instanceof ListScope;
List<SqlValidatorNamespace> children =
((ListScope) ancestorScope).getChildren();
for (int i = 0; i < childNamespaceIndex; i++) {
SqlValidatorNamespace child = children.get(i);
namespaceOffset +=
child.getRowType().getFieldCount();
}
}
RexFieldAccess topLevelFieldAccess = fieldAccess;
while (topLevelFieldAccess.getReferenceExpr() instanceof RexFieldAccess) {
topLevelFieldAccess = (RexFieldAccess) topLevelFieldAccess.getReferenceExpr();
}
final RelDataTypeField field = rowType.getFieldList()
.get(topLevelFieldAccess.getField().getIndex() - namespaceOffset);
int pos = namespaceOffset + field.getIndex();
assert field.getType()
== topLevelFieldAccess.getField().getType();
assert pos != -1;
// bb.root is an aggregate and only projects group by
// keys.
Map<Integer, Integer> exprProjection =
bb.mapRootRelToFieldProjection.get(bb.root);
if (exprProjection != null) {
// sub-query can reference group by keys projected from
// the root of the outer relation.
Integer projection = exprProjection.get(pos);
if (projection != null) {
pos = projection;
} else {
// correl not grouped
throw new AssertionError("Identifier '" + originalRelName + "."
+ originalFieldName + "' is not a group expr");
}
}
requiredColumns.set(pos);
correlNames.add(correlName);
}
if (correlNames.isEmpty()) {
// None of the correlating variables originated in this scope.
return null;
}
RelNode r = r0;
if (correlNames.size() > 1) {
// The same table was referenced more than once.
// So we deduplicate.
r = DeduplicateCorrelateVariables.go(rexBuilder, correlNames.get(0),
Util.skip(correlNames), r0);
// Add new node to leaves.
leaves.put(r, r.getRowType().getFieldCount());
}
return new CorrelationUse(correlNames.get(0), requiredColumns.build(), r);
}
/**
* Determines whether a sub-query is non-correlated. Note that a
* non-correlated sub-query can contain correlated references, provided those
* references do not reference select statements that are parents of the
* sub-query.
*
* @param subq the sub-query
* @param bb blackboard used while converting the sub-query, i.e., the
* blackboard of the parent query of this sub-query
* @return true if the sub-query is non-correlated
*/
private boolean isSubQueryNonCorrelated(RelNode subq, Blackboard bb) {
Set<CorrelationId> correlatedVariables = RelOptUtil.getVariablesUsed(subq);
for (CorrelationId correlName : correlatedVariables) {
DeferredLookup lookup = requireNonNull(
mapCorrelToDeferred.get(correlName),
() -> "correlation variable is not found: " + correlName);
String originalRelName = lookup.getOriginalRelName();
final SqlNameMatcher nameMatcher =
lookup.bb.scope().getValidator().getCatalogReader().nameMatcher();
final SqlValidatorScope.ResolvedImpl resolved =
new SqlValidatorScope.ResolvedImpl();
lookup.bb.scope().resolve(ImmutableList.of(originalRelName), nameMatcher,
false, resolved);
SqlValidatorScope ancestorScope = resolved.only().scope;
// If the correlated reference is in a scope that's "above" the
// sub-query, then this is a correlated sub-query.
SqlValidatorScope parentScope = bb.scope;
do {
if (ancestorScope == parentScope) {
return false;
}
if (parentScope instanceof DelegatingScope) {
parentScope = ((DelegatingScope) parentScope).getParent();
} else {
break;
}
} while (parentScope != null);
}
return true;
}
/**
* Returns a list of fields to be prefixed to each relational expression.
*
* @return List of system fields
*/
protected List<RelDataTypeField> getSystemFields() {
return Collections.emptyList();
}
private void convertJoin(Blackboard bb, SqlJoin join) {
SqlValidator validator = validator();
final SqlValidatorScope scope = validator.getJoinScope(join);
final Blackboard fromBlackboard = createBlackboard(scope, null, false);
SqlNode left = join.getLeft();
SqlNode right = join.getRight();
final SqlValidatorScope leftScope =
Util.first(validator.getJoinScope(left),
((DelegatingScope) bb.scope()).getParent());
final Blackboard leftBlackboard =
createBlackboard(leftScope, null, false);
final SqlValidatorScope rightScope =
Util.first(validator.getJoinScope(right),
((DelegatingScope) bb.scope()).getParent());
final Blackboard rightBlackboard =
createBlackboard(rightScope, null, false);
convertFrom(leftBlackboard, left);
final RelNode leftRel = requireNonNull(leftBlackboard.root, "leftBlackboard.root");
convertFrom(rightBlackboard, right);
final RelNode tempRightRel = requireNonNull(rightBlackboard.root, "rightBlackboard.root");
final JoinConditionType conditionType = join.getConditionType();
final RexNode condition;
final RelNode rightRel;
if (join.isNatural()) {
condition = convertNaturalCondition(getNamespace(left),
getNamespace(right));
rightRel = tempRightRel;
} else {
switch (conditionType) {
case NONE:
condition = rexBuilder.makeLiteral(true);
rightRel = tempRightRel;
break;
case USING:
condition = convertUsingCondition(join,
getNamespace(left),
getNamespace(right));
rightRel = tempRightRel;
break;
case ON:
Pair<RexNode, RelNode> conditionAndRightNode = convertOnCondition(fromBlackboard,
join,
leftRel,
tempRightRel);
condition = conditionAndRightNode.left;
rightRel = conditionAndRightNode.right;
break;
default:
throw Util.unexpected(conditionType);
}
}
final RelNode joinRel = createJoin(
fromBlackboard,
leftRel,
rightRel,
condition,
convertJoinType(join.getJoinType()));
bb.setRoot(joinRel, false);
}
private RexNode convertNaturalCondition(
SqlValidatorNamespace leftNamespace,
SqlValidatorNamespace rightNamespace) {
final List<String> columnList =
SqlValidatorUtil.deriveNaturalJoinColumnList(
catalogReader.nameMatcher(),
leftNamespace.getRowType(),
rightNamespace.getRowType());
return convertUsing(leftNamespace, rightNamespace, columnList);
}
private RexNode convertUsingCondition(
SqlJoin join,
SqlValidatorNamespace leftNamespace,
SqlValidatorNamespace rightNamespace) {
final SqlNodeList list = (SqlNodeList) requireNonNull(join.getCondition(),
() -> "getCondition for join " + join);
return convertUsing(leftNamespace, rightNamespace,
ImmutableList.copyOf(SqlIdentifier.simpleNames(list)));
}
/**
* This currently does not expand correlated full outer joins correctly. Replaying on the right
* side to correctly support left joins multiplicities.
*
* <blockquote><pre>
* SELECT *
* FROM t1
* LEFT JOIN t2 ON
* EXIST(SELECT t3.c3 WHERE t1.c1 = t3.c1 AND t2.c2 = t3.c2)
* AND NOT (t2.t2 = 2)
* </pre></blockquote>
*
* <p>Given the de-correlated query produces:
*
* <blockquote><pre>
* t1.c1 | t2.c2
* ------+------
* 1 | 1
* 1 | 2
* </pre></blockquote>
*
* <p>If correlated query was replayed on the left side, then an extra rows would be emitted for
* every {code t1.c1 = 1}, where it failed to join to right side due to {code NOT(t2.t2 = 2)}.
* However, if the query is joined on the right, side multiplicity is maintained.
*/
private Pair<RexNode, RelNode> convertOnCondition(
Blackboard bb,
SqlJoin join,
RelNode leftRel,
RelNode rightRel) {
SqlNode condition = requireNonNull(join.getCondition(),
() -> "getCondition for join " + join);
bb.setRoot(ImmutableList.of(leftRel, rightRel));
replaceSubQueries(bb, condition, RelOptUtil.Logic.UNKNOWN_AS_FALSE);
final RelNode newRightRel = bb.root == null || bb.registered.size() == 0
? rightRel
: bb.reRegister(rightRel);
bb.setRoot(ImmutableList.of(leftRel, newRightRel));
RexNode conditionExp = bb.convertExpression(condition);
return Pair.of(conditionExp, newRightRel);
}
/**
* Returns an expression for matching columns of a USING clause or inferred
* from NATURAL JOIN. "a JOIN b USING (x, y)" becomes "a.x = b.x AND a.y =
* b.y". Returns null if the column list is empty.
*
* @param leftNamespace Namespace of left input to join
* @param rightNamespace Namespace of right input to join
* @param nameList List of column names to join on
* @return Expression to match columns from name list, or true if name list
* is empty
*/
private RexNode convertUsing(SqlValidatorNamespace leftNamespace,
SqlValidatorNamespace rightNamespace,
List<String> nameList) {
final SqlNameMatcher nameMatcher = catalogReader.nameMatcher();
final List<RexNode> list = new ArrayList<>();
for (String name : nameList) {
List<RexNode> operands = new ArrayList<>();
int offset = 0;
for (SqlValidatorNamespace n : ImmutableList.of(leftNamespace,
rightNamespace)) {
final RelDataType rowType = n.getRowType();
final RelDataTypeField field = nameMatcher.field(rowType, name);
assert field != null : "field " + name + " is not found in " + rowType
+ " with " + nameMatcher;
operands.add(
rexBuilder.makeInputRef(field.getType(),
offset + field.getIndex()));
offset += rowType.getFieldList().size();
}
list.add(rexBuilder.makeCall(SqlStdOperatorTable.EQUALS, operands));
}
return RexUtil.composeConjunction(rexBuilder, list);
}
private static JoinRelType convertJoinType(JoinType joinType) {
switch (joinType) {
case COMMA:
case INNER:
case CROSS:
return JoinRelType.INNER;
case FULL:
return JoinRelType.FULL;
case LEFT:
return JoinRelType.LEFT;
case RIGHT:
return JoinRelType.RIGHT;
default:
throw Util.unexpected(joinType);
}
}
/**
* Converts the SELECT, GROUP BY and HAVING clauses of an aggregate query.
*
* <p>This method extracts SELECT, GROUP BY and HAVING clauses, and creates
* an {@link AggConverter}, then delegates to {@link #createAggImpl}.
* Derived class may override this method to change any of those clauses or
* specify a different {@link AggConverter}.
*
* @param bb Scope within which to resolve identifiers
* @param select Query
* @param orderExprList Additional expressions needed to implement ORDER BY
*/
protected void convertAgg(
Blackboard bb,
SqlSelect select,
List<SqlNode> orderExprList) {
assert bb.root != null : "precondition: child != null";
SqlNodeList groupList = select.getGroup();
SqlNodeList selectList = select.getSelectList();
SqlNode having = select.getHaving();
final AggConverter aggConverter = new AggConverter(bb, select);
createAggImpl(
bb,
aggConverter,
selectList,
groupList,
having,
orderExprList);
}
protected final void createAggImpl(
Blackboard bb,
final AggConverter aggConverter,
SqlNodeList selectList,
@Nullable SqlNodeList groupList,
@Nullable SqlNode having,
List<SqlNode> orderExprList) {
// Find aggregate functions in SELECT and HAVING clause
final AggregateFinder aggregateFinder = new AggregateFinder();
selectList.accept(aggregateFinder);
if (having != null) {
having.accept(aggregateFinder);
}
// first replace the sub-queries inside the aggregates
// because they will provide input rows to the aggregates.
replaceSubQueries(bb, aggregateFinder.list,
RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
// also replace sub-queries inside filters in the aggregates
replaceSubQueries(bb, aggregateFinder.filterList,
RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
// also replace sub-queries inside ordering spec in the aggregates
replaceSubQueries(bb, aggregateFinder.orderList,
RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
// If group-by clause is missing, pretend that it has zero elements.
if (groupList == null) {
groupList = SqlNodeList.EMPTY;
}
replaceSubQueries(bb, groupList, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
// register the group exprs
// build a map to remember the projections from the top scope to the
// output of the current root.
//
// Calcite allows expressions, not just column references in
// group by list. This is not SQL 2003 compliant, but hey.
final AggregatingSelectScope scope = requireNonNull(
aggConverter.aggregatingSelectScope,
"aggregatingSelectScope");
final AggregatingSelectScope.Resolved r = scope.resolved.get();
for (SqlNode groupExpr : r.groupExprList) {
aggConverter.addGroupExpr(groupExpr);
}
final RexNode havingExpr;
final List<Pair<RexNode, String>> projects = new ArrayList<>();
try {
Preconditions.checkArgument(bb.agg == null, "already in agg mode");
bb.agg = aggConverter;
// convert the select and having expressions, so that the
// agg converter knows which aggregations are required
selectList.accept(aggConverter);
// Assert we don't have dangling items left in the stack
assert !aggConverter.inOver;
for (SqlNode expr : orderExprList) {
expr.accept(aggConverter);
assert !aggConverter.inOver;
}
if (having != null) {
having.accept(aggConverter);
assert !aggConverter.inOver;
}
// compute inputs to the aggregator
List<Pair<RexNode, @Nullable String>> preExprs = aggConverter.getPreExprs();
if (preExprs.size() == 0) {
// Special case for COUNT(*), where we can end up with no inputs
// at all. The rest of the system doesn't like 0-tuples, so we
// select a dummy constant here.
final RexNode zero = rexBuilder.makeExactLiteral(BigDecimal.ZERO);
preExprs = ImmutableList.of(Pair.of(zero, null));
}
final RelNode inputRel = bb.root();
// Project the expressions required by agg and having.
bb.setRoot(
relBuilder.push(inputRel)
.projectNamed(Pair.left(preExprs), Pair.right(preExprs), false)
.build(),
false);
bb.mapRootRelToFieldProjection.put(bb.root(), r.groupExprProjection);
// REVIEW jvs 31-Oct-2007: doesn't the declaration of
// monotonicity here assume sort-based aggregation at
// the physical level?
// Tell bb which of group columns are sorted.
bb.columnMonotonicities.clear();
for (SqlNode groupItem : groupList) {
bb.columnMonotonicities.add(
bb.scope().getMonotonicity(groupItem));
}
// Add the aggregator
bb.setRoot(
createAggregate(bb, r.groupSet, r.groupSets.asList(),
aggConverter.getAggCalls()), false);
bb.mapRootRelToFieldProjection.put(bb.root(), r.groupExprProjection);
// Replace sub-queries in having here and modify having to use
// the replaced expressions
if (having != null) {
SqlNode newHaving = pushDownNotForIn(bb.scope(), having);
replaceSubQueries(bb, newHaving, RelOptUtil.Logic.UNKNOWN_AS_FALSE);
havingExpr = bb.convertExpression(newHaving);
} else {
havingExpr = relBuilder.literal(true);
}
// Now convert the other sub-queries in the select list.
// This needs to be done separately from the sub-query inside
// any aggregate in the select list, and after the aggregate rel
// is allocated.
replaceSubQueries(bb, selectList, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
// Now sub-queries in the entire select list have been converted.
// Convert the select expressions to get the final list to be
// projected.
int k = 0;
// For select expressions, use the field names previously assigned
// by the validator. If we derive afresh, we might generate names
// like "EXPR$2" that don't match the names generated by the
// validator. This is especially the case when there are system
// fields; system fields appear in the relnode's rowtype but do not
// (yet) appear in the validator type.
final SelectScope selectScope =
SqlValidatorUtil.getEnclosingSelectScope(bb.scope);
assert selectScope != null;
final SqlValidatorNamespace selectNamespace = getNamespaceOrNull(selectScope.getNode());
assert selectNamespace != null : "selectNamespace must not be null for " + selectScope;
final List<String> names =
selectNamespace.getRowType().getFieldNames();
int sysFieldCount = selectList.size() - names.size();
for (SqlNode expr : selectList) {
projects.add(
Pair.of(bb.convertExpression(expr),
k < sysFieldCount
? castNonNull(validator().deriveAlias(expr, k++))
: names.get(k++ - sysFieldCount)));
}
for (SqlNode expr : orderExprList) {
projects.add(
Pair.of(bb.convertExpression(expr),
castNonNull(validator().deriveAlias(expr, k++))));
}
} finally {
bb.agg = null;
}
// implement HAVING (we have already checked that it is non-trivial)
relBuilder.push(bb.root());
if (havingExpr != null) {
relBuilder.filter(havingExpr);
}
// implement the SELECT list
relBuilder.project(Pair.left(projects), Pair.right(projects))
.rename(Pair.right(projects));
bb.setRoot(relBuilder.build(), false);
// Tell bb which of group columns are sorted.
bb.columnMonotonicities.clear();
for (SqlNode selectItem : selectList) {
bb.columnMonotonicities.add(
bb.scope().getMonotonicity(selectItem));
}
}
/**
* Creates an Aggregate.
*
* <p>In case the aggregate rel changes the order in which it projects
* fields, the <code>groupExprProjection</code> parameter is provided, and
* the implementation of this method may modify it.
*
* <p>The <code>sortedCount</code> parameter is the number of expressions
* known to be monotonic. These expressions must be on the leading edge of
* the grouping keys. The default implementation of this method ignores this
* parameter.
*
* @param bb Blackboard
* @param groupSet Bit set of ordinals of grouping columns
* @param groupSets Grouping sets
* @param aggCalls Array of calls to aggregate functions
* @return LogicalAggregate
*/
protected RelNode createAggregate(Blackboard bb, ImmutableBitSet groupSet,
ImmutableList<ImmutableBitSet> groupSets, List<AggregateCall> aggCalls) {
relBuilder.push(bb.root());
final RelBuilder.GroupKey groupKey =
relBuilder.groupKey(groupSet, (Iterable<ImmutableBitSet>) groupSets);
return relBuilder.aggregate(groupKey, aggCalls)
.build();
}
public RexDynamicParam convertDynamicParam(
final SqlDynamicParam dynamicParam) {
// REVIEW jvs 8-Jan-2005: dynamic params may be encountered out of
// order. Should probably cross-check with the count from the parser
// at the end and make sure they all got filled in. Why doesn't List
// have a resize() method?!? Make this a utility.
while (dynamicParam.getIndex() >= dynamicParamSqlNodes.size()) {
dynamicParamSqlNodes.add(null);
}
dynamicParamSqlNodes.set(
dynamicParam.getIndex(),
dynamicParam);
return rexBuilder.makeDynamicParam(
getDynamicParamType(dynamicParam.getIndex()),
dynamicParam.getIndex());
}
/**
* Creates a list of collations required to implement the ORDER BY clause,
* if there is one. Populates <code>extraOrderExprs</code> with any sort
* expressions which are not in the select clause.
*
* @param bb Scope within which to resolve identifiers
* @param select Select clause. Never null, because we invent a
* dummy SELECT if ORDER BY is applied to a set
* operation (UNION etc.)
* @param orderList Order by clause, may be null
* @param extraOrderExprs Sort expressions which are not in the select
* clause (output)
* @param collationList List of collations (output)
*/
protected void gatherOrderExprs(
Blackboard bb,
SqlSelect select,
@Nullable SqlNodeList orderList,
List<SqlNode> extraOrderExprs,
List<RelFieldCollation> collationList) {
// TODO: add validation rules to SqlValidator also
assert bb.root != null : "precondition: child != null";
assert select != null;
if (orderList == null) {
return;
}
if (removeSortInSubQuery(bb.top)) {
SqlNode offset = select.getOffset();
if ((offset == null
|| (offset instanceof SqlLiteral
&& Objects.equals(((SqlLiteral) offset).bigDecimalValue(), BigDecimal.ZERO)))
&& select.getFetch() == null) {
return;
}
}
for (SqlNode orderItem : orderList) {
collationList.add(
convertOrderItem(select, orderItem, extraOrderExprs,
RelFieldCollation.Direction.ASCENDING,
RelFieldCollation.NullDirection.UNSPECIFIED));
}
}
protected RelFieldCollation convertOrderItem(
SqlSelect select,
SqlNode orderItem, List<SqlNode> extraExprs,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection) {
assert select != null;
// Handle DESC keyword, e.g. 'select a, b from t order by a desc'.
switch (orderItem.getKind()) {
case DESCENDING:
return convertOrderItem(
select,
((SqlCall) orderItem).operand(0),
extraExprs,
RelFieldCollation.Direction.DESCENDING,
nullDirection);
case NULLS_FIRST:
return convertOrderItem(
select,
((SqlCall) orderItem).operand(0),
extraExprs,
direction,
RelFieldCollation.NullDirection.FIRST);
case NULLS_LAST:
return convertOrderItem(
select,
((SqlCall) orderItem).operand(0),
extraExprs,
direction,
RelFieldCollation.NullDirection.LAST);
default:
break;
}
SqlNode converted = validator().expandOrderExpr(select, orderItem);
switch (nullDirection) {
case UNSPECIFIED:
nullDirection = validator().config().defaultNullCollation().last(desc(direction))
? RelFieldCollation.NullDirection.LAST
: RelFieldCollation.NullDirection.FIRST;
break;
default:
break;
}
// Scan the select list and order exprs for an identical expression.
final SelectScope selectScope = requireNonNull(
validator().getRawSelectScope(select),
() -> "getRawSelectScope is not found for " + select);
int ordinal = -1;
List<SqlNode> expandedSelectList = selectScope.getExpandedSelectList();
for (SqlNode selectItem : requireNonNull(expandedSelectList, "expandedSelectList")) {
++ordinal;
if (converted.equalsDeep(stripAs(selectItem), Litmus.IGNORE)) {
return new RelFieldCollation(ordinal, direction, nullDirection);
}
}
for (SqlNode extraExpr : extraExprs) {
++ordinal;
if (converted.equalsDeep(extraExpr, Litmus.IGNORE)) {
return new RelFieldCollation(ordinal, direction, nullDirection);
}
}
// TODO: handle collation sequence
// TODO: flag expressions as non-standard
extraExprs.add(converted);
return new RelFieldCollation(ordinal + 1, direction, nullDirection);
}
private static boolean desc(RelFieldCollation.Direction direction) {
switch (direction) {
case DESCENDING:
case STRICTLY_DESCENDING:
return true;
default:
return false;
}
}
@Deprecated // to be removed before 2.0
protected boolean enableDecorrelation() {
// disable sub-query decorrelation when needed.
// e.g. if outer joins are not supported.
return config.isDecorrelationEnabled();
}
protected RelNode decorrelateQuery(RelNode rootRel) {
return RelDecorrelator.decorrelateQuery(rootRel, relBuilder);
}
/**
* Returns whether to trim unused fields as part of the conversion process.
*
* @return Whether to trim unused fields
*/
@Deprecated // to be removed before 2.0
public boolean isTrimUnusedFields() {
return config.isTrimUnusedFields();
}
/**
* Recursively converts a query to a relational expression.
*
* @param query Query
* @param top Whether this query is the top-level query of the
* statement
* @param targetRowType Target row type, or null
* @return Relational expression
*/
protected RelRoot convertQueryRecursive(SqlNode query, boolean top,
@Nullable RelDataType targetRowType) {
final SqlKind kind = query.getKind();
switch (kind) {
case SELECT:
return RelRoot.of(convertSelect((SqlSelect) query, top), kind);
case INSERT:
return RelRoot.of(convertInsert((SqlInsert) query), kind);
case DELETE:
return RelRoot.of(convertDelete((SqlDelete) query), kind);
case UPDATE:
return RelRoot.of(convertUpdate((SqlUpdate) query), kind);
case MERGE:
return RelRoot.of(convertMerge((SqlMerge) query), kind);
case UNION:
case INTERSECT:
case EXCEPT:
return RelRoot.of(convertSetOp((SqlCall) query), kind);
case WITH:
return convertWith((SqlWith) query, top);
case VALUES:
return RelRoot.of(convertValues((SqlCall) query, targetRowType), kind);
default:
throw new AssertionError("not a query: " + query);
}
}
/**
* Converts a set operation (UNION, INTERSECT, MINUS) into relational
* expressions.
*
* @param call Call to set operator
* @return Relational expression
*/
protected RelNode convertSetOp(SqlCall call) {
final RelNode left =
convertQueryRecursive(call.operand(0), false, null).project();
final RelNode right =
convertQueryRecursive(call.operand(1), false, null).project();
switch (call.getKind()) {
case UNION:
return LogicalUnion.create(ImmutableList.of(left, right), all(call));
case INTERSECT:
return LogicalIntersect.create(ImmutableList.of(left, right), all(call));
case EXCEPT:
return LogicalMinus.create(ImmutableList.of(left, right), all(call));
default:
throw Util.unexpected(call.getKind());
}
}
private static boolean all(SqlCall call) {
return ((SqlSetOperator) call.getOperator()).isAll();
}
protected RelNode convertInsert(SqlInsert call) {
RelOptTable targetTable = getTargetTable(call);
final RelDataType targetRowType =
validator().getValidatedNodeType(call);
assert targetRowType != null;
RelNode sourceRel =
convertQueryRecursive(call.getSource(), true, targetRowType).project();
RelNode massagedRel = convertColumnList(call, sourceRel);
return createModify(targetTable, massagedRel);
}
/** Creates a relational expression to modify a table or modifiable view. */
private RelNode createModify(RelOptTable targetTable, RelNode source) {
final ModifiableTable modifiableTable =
targetTable.unwrap(ModifiableTable.class);
if (modifiableTable != null
&& modifiableTable == targetTable.unwrap(Table.class)) {
return modifiableTable.toModificationRel(cluster, targetTable,
catalogReader, source, LogicalTableModify.Operation.INSERT, null,
null, false);
}
final ModifiableView modifiableView =
targetTable.unwrap(ModifiableView.class);
if (modifiableView != null) {
final Table delegateTable = modifiableView.getTable();
final RelDataType delegateRowType = delegateTable.getRowType(typeFactory);
final RelOptTable delegateRelOptTable =
RelOptTableImpl.create(null, delegateRowType, delegateTable,
modifiableView.getTablePath());
final RelNode newSource =
createSource(targetTable, source, modifiableView, delegateRowType);
return createModify(delegateRelOptTable, newSource);
}
return LogicalTableModify.create(targetTable, catalogReader, source,
LogicalTableModify.Operation.INSERT, null, null, false);
}
/** Wraps a relational expression in the projects and filters implied by
* a {@link ModifiableView}.
*
* <p>The input relational expression is suitable for inserting into the view,
* and the returned relational expression is suitable for inserting into its
* delegate table.
*
* <p>In principle, the delegate table of a view might be another modifiable
* view, and if so, the process can be repeated. */
private RelNode createSource(RelOptTable targetTable, RelNode source,
ModifiableView modifiableView, RelDataType delegateRowType) {
final ImmutableIntList mapping = modifiableView.getColumnMapping();
assert mapping.size() == targetTable.getRowType().getFieldCount();
// For columns represented in the mapping, the expression is just a field
// reference.
final Map<Integer, RexNode> projectMap = new HashMap<>();
final List<RexNode> filters = new ArrayList<>();
for (int i = 0; i < mapping.size(); i++) {
int target = mapping.get(i);
if (target >= 0) {
projectMap.put(target, RexInputRef.of(i, source.getRowType()));
}
}
// For columns that are not in the mapping, and have a constraint of the
// form "column = value", the expression is the literal "value".
//
// If a column has multiple constraints, the extra ones will become a
// filter.
final RexNode constraint =
modifiableView.getConstraint(rexBuilder, delegateRowType);
RelOptUtil.inferViewPredicates(projectMap, filters, constraint);
final List<Pair<RexNode, String>> projects = new ArrayList<>();
for (RelDataTypeField field : delegateRowType.getFieldList()) {
RexNode node = projectMap.get(field.getIndex());
if (node == null) {
node = rexBuilder.makeNullLiteral(field.getType());
}
projects.add(
Pair.of(rexBuilder.ensureType(field.getType(), node, false),
field.getName()));
}
return relBuilder.push(source)
.projectNamed(Pair.left(projects), Pair.right(projects), false)
.filter(filters)
.build();
}
private RelOptTable.ToRelContext createToRelContext(List<RelHint> hints) {
return ViewExpanders.toRelContext(viewExpander, cluster, hints);
}
public RelNode toRel(final RelOptTable table, final List<RelHint> hints) {
final RelNode scan = table.toRel(createToRelContext(hints));
final InitializerExpressionFactory ief =
table.maybeUnwrap(InitializerExpressionFactory.class)
.orElse(NullInitializerExpressionFactory.INSTANCE);
boolean hasVirtualFields = table.getRowType()
.getFieldList().stream()
.anyMatch(f -> ief.generationStrategy(table, f.getIndex()) == ColumnStrategy.VIRTUAL);
if (hasVirtualFields) {
final RexNode sourceRef = rexBuilder.makeRangeReference(scan);
final Blackboard bb = createInsertBlackboard(table, sourceRef,
table.getRowType().getFieldNames());
final List<RexNode> list = new ArrayList<>();
for (RelDataTypeField f : table.getRowType().getFieldList()) {
final ColumnStrategy strategy =
ief.generationStrategy(table, f.getIndex());
switch (strategy) {
case VIRTUAL:
list.add(ief.newColumnDefaultValue(table, f.getIndex(), bb));
break;
default:
list.add(
rexBuilder.makeInputRef(scan,
RelOptTableImpl.realOrdinal(table, f.getIndex())));
}
}
relBuilder.push(scan);
relBuilder.project(list);
final RelNode project = relBuilder.build();
BiFunction<InitializerContext, RelNode, RelNode> postConversionHook =
ief.postExpressionConversionHook();
if (postConversionHook != null) {
return postConversionHook.apply(bb, project);
} else {
return project;
}
}
return scan;
}
protected RelOptTable getTargetTable(SqlNode call) {
final SqlValidatorNamespace targetNs = getNamespace(call);
SqlValidatorNamespace namespace;
if (targetNs.isWrapperFor(SqlValidatorImpl.DmlNamespace.class)) {
namespace = targetNs.unwrap(SqlValidatorImpl.DmlNamespace.class);
} else {
namespace = targetNs.resolve();
}
RelOptTable table = SqlValidatorUtil.getRelOptTable(namespace, catalogReader, null, null);
return requireNonNull(table, "no table found for " + call);
}
/**
* Creates a source for an INSERT statement.
*
* <p>If the column list is not specified, source expressions match target
* columns in order.
*
* <p>If the column list is specified, Source expressions are mapped to
* target columns by name via targetColumnList, and may not cover the entire
* target table. So, we'll make up a full row, using a combination of
* default values and the source expressions provided.
*
* @param call Insert expression
* @param source Source relational expression
* @return Converted INSERT statement
*/
protected RelNode convertColumnList(final SqlInsert call, RelNode source) {
RelDataType sourceRowType = source.getRowType();
final RexNode sourceRef =
rexBuilder.makeRangeReference(sourceRowType, 0, false);
final List<String> targetColumnNames = new ArrayList<>();
final List<RexNode> columnExprs = new ArrayList<>();
collectInsertTargets(call, sourceRef, targetColumnNames, columnExprs);
final RelOptTable targetTable = getTargetTable(call);
final RelDataType targetRowType = RelOptTableImpl.realRowType(targetTable);
final List<RelDataTypeField> targetFields = targetRowType.getFieldList();
final List<@Nullable RexNode> sourceExps =
new ArrayList<>(
Collections.nCopies(targetFields.size(), null));
final List<@Nullable String> fieldNames =
new ArrayList<>(
Collections.nCopies(targetFields.size(), null));
final InitializerExpressionFactory initializerFactory =
getInitializerFactory(getNamespace(call).getTable());
// Walk the name list and place the associated value in the
// expression list according to the ordinal value returned from
// the table construct, leaving nulls in the list for columns
// that are not referenced.
final SqlNameMatcher nameMatcher = catalogReader.nameMatcher();
for (Pair<String, RexNode> p : Pair.zip(targetColumnNames, columnExprs)) {
RelDataTypeField field = nameMatcher.field(targetRowType, p.left);
assert field != null : "column " + p.left + " not found";
sourceExps.set(field.getIndex(), p.right);
}
// Lazily create a blackboard that contains all non-generated columns.
final Supplier<Blackboard> bb = () ->
createInsertBlackboard(targetTable, sourceRef, targetColumnNames);
// Walk the expression list and get default values for any columns
// that were not supplied in the statement. Get field names too.
for (int i = 0; i < targetFields.size(); ++i) {
final RelDataTypeField field = targetFields.get(i);
final String fieldName = field.getName();
fieldNames.set(i, fieldName);
RexNode sourceExpression = sourceExps.get(i);
if (sourceExpression == null
|| sourceExpression.getKind() == SqlKind.DEFAULT) {
sourceExpression =
initializerFactory.newColumnDefaultValue(targetTable, i, bb.get());
// bare nulls are dangerous in the wrong hands
sourceExpression =
castNullLiteralIfNeeded(sourceExpression, field.getType());
sourceExps.set(i, sourceExpression);
}
}
// sourceExps should not contain nulls (see the loop above)
@SuppressWarnings("assignment.type.incompatible")
List<RexNode> nonNullExprs = sourceExps;
return relBuilder.push(source)
.projectNamed(nonNullExprs, fieldNames, false)
.build();
}
/** Creates a blackboard for translating the expressions of generated columns
* in an INSERT statement. */
private Blackboard createInsertBlackboard(RelOptTable targetTable,
RexNode sourceRef, List<String> targetColumnNames) {
final Map<String, RexNode> nameToNodeMap = new HashMap<>();
int j = 0;
// Assign expressions for non-generated columns.
final List<ColumnStrategy> strategies = targetTable.getColumnStrategies();
final List<String> targetFields = targetTable.getRowType().getFieldNames();
for (String targetColumnName : targetColumnNames) {
final int i = targetFields.indexOf(targetColumnName);
switch (strategies.get(i)) {
case STORED:
case VIRTUAL:
break;
default:
nameToNodeMap.put(targetColumnName,
rexBuilder.makeFieldAccess(sourceRef, j++));
}
}
return createBlackboard(null, nameToNodeMap, false);
}
private static InitializerExpressionFactory getInitializerFactory(
@Nullable SqlValidatorTable validatorTable) {
// We might unwrap a null instead of a InitializerExpressionFactory.
final Table table = unwrap(validatorTable, Table.class);
if (table != null) {
InitializerExpressionFactory f =
unwrap(table, InitializerExpressionFactory.class);
if (f != null) {
return f;
}
}
return NullInitializerExpressionFactory.INSTANCE;
}
private static <T extends Object> @Nullable T unwrap(@Nullable Object o, Class<T> clazz) {
if (o instanceof Wrapper) {
return ((Wrapper) o).unwrap(clazz);
}
return null;
}
private RexNode castNullLiteralIfNeeded(RexNode node, RelDataType type) {
if (!RexLiteral.isNullLiteral(node)) {
return node;
}
return rexBuilder.makeCast(type, node);
}
/**
* Given an INSERT statement, collects the list of names to be populated and
* the expressions to put in them.
*
* @param call Insert statement
* @param sourceRef Expression representing a row from the source
* relational expression
* @param targetColumnNames List of target column names, to be populated
* @param columnExprs List of expressions, to be populated
*/
protected void collectInsertTargets(
SqlInsert call,
final RexNode sourceRef,
final List<String> targetColumnNames,
List<RexNode> columnExprs) {
final RelOptTable targetTable = getTargetTable(call);
final RelDataType tableRowType = targetTable.getRowType();
SqlNodeList targetColumnList = call.getTargetColumnList();
if (targetColumnList == null) {
if (validator().config().sqlConformance().isInsertSubsetColumnsAllowed()) {
final RelDataType targetRowType =
typeFactory.createStructType(
tableRowType.getFieldList()
.subList(0, sourceRef.getType().getFieldCount()));
targetColumnNames.addAll(targetRowType.getFieldNames());
} else {
targetColumnNames.addAll(tableRowType.getFieldNames());
}
} else {
for (int i = 0; i < targetColumnList.size(); i++) {
SqlIdentifier id = (SqlIdentifier) targetColumnList.get(i);
RelDataTypeField field =
SqlValidatorUtil.getTargetField(
tableRowType, typeFactory, id, catalogReader, targetTable);
assert field != null : "column " + id.toString() + " not found";
targetColumnNames.add(field.getName());
}
}
final Blackboard bb =
createInsertBlackboard(targetTable, sourceRef, targetColumnNames);
// Next, assign expressions for generated columns.
final List<ColumnStrategy> strategies = targetTable.getColumnStrategies();
for (String columnName : targetColumnNames) {
final int i = tableRowType.getFieldNames().indexOf(columnName);
final RexNode expr;
switch (strategies.get(i)) {
case STORED:
final InitializerExpressionFactory f =
targetTable.maybeUnwrap(InitializerExpressionFactory.class)
.orElse(NullInitializerExpressionFactory.INSTANCE);
expr = f.newColumnDefaultValue(targetTable, i, bb);
break;
case VIRTUAL:
expr = null;
break;
default:
expr = requireNonNull(bb.nameToNodeMap, "nameToNodeMap")
.get(columnName);
}
// expr is nullable, however, all the nulls will be removed in the loop below
columnExprs.add(castNonNull(expr));
}
// Remove virtual columns from the list.
for (int i = 0; i < targetColumnNames.size(); i++) {
if (columnExprs.get(i) == null) {
columnExprs.remove(i);
targetColumnNames.remove(i);
--i;
}
}
}
private RelNode convertDelete(SqlDelete call) {
RelOptTable targetTable = getTargetTable(call);
RelNode sourceRel = convertSelect(
requireNonNull(call.getSourceSelect(), () -> "sourceSelect for " + call),
false);
return LogicalTableModify.create(targetTable, catalogReader, sourceRel,
LogicalTableModify.Operation.DELETE, null, null, false);
}
private RelNode convertUpdate(SqlUpdate call) {
final SqlValidatorScope scope = validator().getWhereScope(
requireNonNull(call.getSourceSelect(), () -> "sourceSelect for " + call));
Blackboard bb = createBlackboard(scope, null, false);
replaceSubQueries(bb, call, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
RelOptTable targetTable = getTargetTable(call);
// convert update column list from SqlIdentifier to String
final List<String> targetColumnNameList = new ArrayList<>();
final RelDataType targetRowType = targetTable.getRowType();
for (SqlNode node : call.getTargetColumnList()) {
SqlIdentifier id = (SqlIdentifier) node;
RelDataTypeField field =
SqlValidatorUtil.getTargetField(
targetRowType, typeFactory, id, catalogReader, targetTable);
assert field != null : "column " + id.toString() + " not found";
targetColumnNameList.add(field.getName());
}
RelNode sourceRel = convertSelect(
requireNonNull(call.getSourceSelect(), () -> "sourceSelect for " + call), false);
bb.setRoot(sourceRel, false);
ImmutableList.Builder<RexNode> rexNodeSourceExpressionListBuilder = ImmutableList.builder();
for (SqlNode n : call.getSourceExpressionList()) {
RexNode rn = bb.convertExpression(n);
rexNodeSourceExpressionListBuilder.add(rn);
}
return LogicalTableModify.create(targetTable, catalogReader, sourceRel,
LogicalTableModify.Operation.UPDATE, targetColumnNameList,
rexNodeSourceExpressionListBuilder.build(), false);
}
private RelNode convertMerge(SqlMerge call) {
RelOptTable targetTable = getTargetTable(call);
// convert update column list from SqlIdentifier to String
final List<String> targetColumnNameList = new ArrayList<>();
final RelDataType targetRowType = targetTable.getRowType();
SqlUpdate updateCall = call.getUpdateCall();
if (updateCall != null) {
for (SqlNode targetColumn : updateCall.getTargetColumnList()) {
SqlIdentifier id = (SqlIdentifier) targetColumn;
RelDataTypeField field =
SqlValidatorUtil.getTargetField(
targetRowType, typeFactory, id, catalogReader, targetTable);
assert field != null : "column " + id.toString() + " not found";
targetColumnNameList.add(field.getName());
}
}
// replace the projection of the source select with a
// projection that contains the following:
// 1) the expressions corresponding to the new insert row (if there is
// an insert)
// 2) all columns from the target table (if there is an update)
// 3) the set expressions in the update call (if there is an update)
// first, convert the merge's source select to construct the columns
// from the target table and the set expressions in the update call
RelNode mergeSourceRel = convertSelect(
requireNonNull(call.getSourceSelect(), () -> "sourceSelect for " + call), false);
// then, convert the insert statement so we can get the insert
// values expressions
SqlInsert insertCall = call.getInsertCall();
int nLevel1Exprs = 0;
List<RexNode> level1InsertExprs = null;
List<RexNode> level2InsertExprs = null;
if (insertCall != null) {
RelNode insertRel = convertInsert(insertCall);
// if there are 2 level of projections in the insert source, combine
// them into a single project; level1 refers to the topmost project;
// the level1 projection contains references to the level2
// expressions, except in the case where no target expression was
// provided, in which case, the expression is the default value for
// the column; or if the expressions directly map to the source
// table
level1InsertExprs =
((LogicalProject) insertRel.getInput(0)).getProjects();
if (insertRel.getInput(0).getInput(0) instanceof LogicalProject) {
level2InsertExprs =
((LogicalProject) insertRel.getInput(0).getInput(0))
.getProjects();
}
nLevel1Exprs = level1InsertExprs.size();
}
LogicalJoin join = (LogicalJoin) mergeSourceRel.getInput(0);
int nSourceFields = join.getLeft().getRowType().getFieldCount();
final List<RexNode> projects = new ArrayList<>();
for (int level1Idx = 0; level1Idx < nLevel1Exprs; level1Idx++) {
requireNonNull(level1InsertExprs, "level1InsertExprs");
if ((level2InsertExprs != null)
&& (level1InsertExprs.get(level1Idx) instanceof RexInputRef)) {
int level2Idx =
((RexInputRef) level1InsertExprs.get(level1Idx)).getIndex();
projects.add(level2InsertExprs.get(level2Idx));
} else {
projects.add(level1InsertExprs.get(level1Idx));
}
}
if (updateCall != null) {
final LogicalProject project = (LogicalProject) mergeSourceRel;
projects.addAll(
Util.skip(project.getProjects(), nSourceFields));
}
relBuilder.push(join)
.project(projects);
return LogicalTableModify.create(targetTable, catalogReader,
relBuilder.build(), LogicalTableModify.Operation.MERGE,
targetColumnNameList, null, false);
}
/**
* Converts an identifier into an expression in a given scope. For example,
* the "empno" in "select empno from emp join dept" becomes "emp.empno".
*/
private RexNode convertIdentifier(
Blackboard bb,
SqlIdentifier identifier) {
// first check for reserved identifiers like CURRENT_USER
final SqlCall call = bb.getValidator().makeNullaryCall(identifier);
if (call != null) {
return bb.convertExpression(call);
}
String pv = null;
if (bb.isPatternVarRef && identifier.names.size() > 1) {
pv = identifier.names.get(0);
}
final SqlQualified qualified;
if (bb.scope != null) {
qualified = bb.scope.fullyQualify(identifier);
} else {
qualified = SqlQualified.create(null, 1, null, identifier);
}
final Pair<RexNode, @Nullable Map<String, Integer>> e0 = requireNonNull(
bb.lookupExp(qualified),
() -> "no expression found for " + qualified);
RexNode e = e0.left;
for (String name : qualified.suffix()) {
if (e == e0.left && e0.right != null) {
Integer i = requireNonNull(
e0.right.get(name),
() -> "e0.right.get(name) produced null for " + name);
e = rexBuilder.makeFieldAccess(e, i);
} else {
final boolean caseSensitive = true; // name already fully-qualified
if (identifier.isStar() && bb.scope instanceof MatchRecognizeScope) {
e = rexBuilder.makeFieldAccess(e, 0);
} else {
e = rexBuilder.makeFieldAccess(e, name, caseSensitive);
}
}
}
if (e instanceof RexInputRef) {
// adjust the type to account for nulls introduced by outer joins
e = adjustInputRef(bb, (RexInputRef) e);
if (pv != null) {
e = RexPatternFieldRef.of(pv, (RexInputRef) e);
}
}
if (e0.left instanceof RexCorrelVariable) {
assert e instanceof RexFieldAccess;
final RexNode prev =
bb.mapCorrelateToRex.put(((RexCorrelVariable) e0.left).id,
(RexFieldAccess) e);
assert prev == null;
}
return e;
}
/**
* Adjusts the type of a reference to an input field to account for nulls
* introduced by outer joins; and adjusts the offset to match the physical
* implementation.
*
* @param bb Blackboard
* @param inputRef Input ref
* @return Adjusted input ref
*/
protected RexNode adjustInputRef(
Blackboard bb,
RexInputRef inputRef) {
RelDataTypeField field = bb.getRootField(inputRef);
if (field != null) {
if (!SqlTypeUtil.equalSansNullability(typeFactory,
field.getType(), inputRef.getType())) {
return inputRef;
}
return rexBuilder.makeInputRef(
field.getType(),
inputRef.getIndex());
}
return inputRef;
}
/**
* Converts a row constructor into a relational expression.
*
* @param bb Blackboard
* @param rowConstructor Row constructor expression
* @return Relational expression which returns a single row.
*/
private RelNode convertRowConstructor(
Blackboard bb,
SqlCall rowConstructor) {
Preconditions.checkArgument(isRowConstructor(rowConstructor));
final List<SqlNode> operands = rowConstructor.getOperandList();
return convertMultisets(operands, bb);
}
private RelNode convertCursor(Blackboard bb, SubQuery subQuery) {
final SqlCall cursorCall = (SqlCall) subQuery.node;
assert cursorCall.operandCount() == 1;
SqlNode query = cursorCall.operand(0);
RelNode converted = convertQuery(query, false, false).rel;
int iCursor = bb.cursors.size();
bb.cursors.add(converted);
subQuery.expr =
new RexInputRef(
iCursor,
converted.getRowType());
return converted;
}
private RelNode convertMultisets(final List<SqlNode> operands,
Blackboard bb) {
// NOTE: Wael 2/04/05: this implementation is not the most efficient in
// terms of planning since it generates XOs that can be reduced.
final List<Object> joinList = new ArrayList<>();
List<SqlNode> lastList = new ArrayList<>();
for (int i = 0; i < operands.size(); i++) {
SqlNode operand = operands.get(i);
if (!(operand instanceof SqlCall)) {
lastList.add(operand);
continue;
}
final SqlCall call = (SqlCall) operand;
final RelNode input;
switch (call.getKind()) {
case MULTISET_VALUE_CONSTRUCTOR:
case ARRAY_VALUE_CONSTRUCTOR:
final SqlNodeList list =
new SqlNodeList(call.getOperandList(), call.getParserPosition());
CollectNamespace nss = getNamespaceOrNull(call);
Blackboard usedBb;
if (null != nss) {
usedBb = createBlackboard(nss.getScope(), null, false);
} else {
usedBb =
createBlackboard(new ListScope(bb.scope()) {
@Override public SqlNode getNode() {
return call;
}
}, null, false);
}
RelDataType multisetType = validator().getValidatedNodeType(call);
validator().setValidatedNodeType(list,
requireNonNull(multisetType.getComponentType(),
() -> "componentType for multisetType " + multisetType));
input = convertQueryOrInList(usedBb, list, null);
break;
case MULTISET_QUERY_CONSTRUCTOR:
case ARRAY_QUERY_CONSTRUCTOR:
final RelRoot root = convertQuery(call.operand(0), false, true);
input = root.rel;
break;
default:
lastList.add(operand);
continue;
}
if (lastList.size() > 0) {
joinList.add(lastList);
}
lastList = new ArrayList<>();
Collect collect =
new Collect(
cluster,
cluster.traitSetOf(Convention.NONE),
requireNonNull(input, "input"),
castNonNull(validator().deriveAlias(call, i)));
joinList.add(collect);
}
if (joinList.size() == 0) {
joinList.add(lastList);
}
for (int i = 0; i < joinList.size(); i++) {
Object o = joinList.get(i);
if (o instanceof List) {
@SuppressWarnings("unchecked")
List<SqlNode> projectList = (List<SqlNode>) o;
final List<RexNode> selectList = new ArrayList<>();
final List<String> fieldNameList = new ArrayList<>();
for (int j = 0; j < projectList.size(); j++) {
SqlNode operand = projectList.get(j);
selectList.add(bb.convertExpression(operand));
// REVIEW angel 5-June-2005: Use deriveAliasFromOrdinal
// instead of deriveAlias to match field names from
// SqlRowOperator. Otherwise, get error Type
// 'RecordType(INTEGER EMPNO)' has no field 'EXPR$0' when
// doing select * from unnest( select multiset[empno]
// from sales.emps);
fieldNameList.add(SqlUtil.deriveAliasFromOrdinal(j));
}
relBuilder.push(LogicalValues.createOneRow(cluster))
.projectNamed(selectList, fieldNameList, true);
joinList.set(i, relBuilder.build());
}
}
RelNode ret = (RelNode) joinList.get(0);
for (int i = 1; i < joinList.size(); i++) {
RelNode relNode = (RelNode) joinList.get(i);
ret =
RelFactories.DEFAULT_JOIN_FACTORY.createJoin(
ret,
relNode,
ImmutableList.of(),
rexBuilder.makeLiteral(true),
ImmutableSet.of(),
JoinRelType.INNER,
false);
}
return ret;
}
private void convertSelectList(
Blackboard bb,
SqlSelect select,
List<SqlNode> orderList) {
SqlNodeList selectList = select.getSelectList();
selectList = validator().expandStar(selectList, select, false);
replaceSubQueries(bb, selectList, RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
List<String> fieldNames = new ArrayList<>();
final List<RexNode> exprs = new ArrayList<>();
final Collection<String> aliases = new TreeSet<>();
// Project any system fields. (Must be done before regular select items,
// because offsets may be affected.)
final List<SqlMonotonicity> columnMonotonicityList = new ArrayList<>();
extraSelectItems(
bb,
select,
exprs,
fieldNames,
aliases,
columnMonotonicityList);
// Project select clause.
int i = -1;
for (SqlNode expr : selectList) {
++i;
exprs.add(bb.convertExpression(expr));
fieldNames.add(deriveAlias(expr, aliases, i));
}
// Project extra fields for sorting.
for (SqlNode expr : orderList) {
++i;
SqlNode expr2 = validator().expandOrderExpr(select, expr);
exprs.add(bb.convertExpression(expr2));
fieldNames.add(deriveAlias(expr, aliases, i));
}
fieldNames = SqlValidatorUtil.uniquify(fieldNames,
catalogReader.nameMatcher().isCaseSensitive());
relBuilder.push(bb.root())
.projectNamed(exprs, fieldNames, true);
bb.setRoot(relBuilder.build(), false);
assert bb.columnMonotonicities.isEmpty();
bb.columnMonotonicities.addAll(columnMonotonicityList);
for (SqlNode selectItem : selectList) {
bb.columnMonotonicities.add(
selectItem.getMonotonicity(bb.scope));
}
}
/**
* Adds extra select items. The default implementation adds nothing; derived
* classes may add columns to exprList, nameList, aliasList and
* columnMonotonicityList.
*
* @param bb Blackboard
* @param select Select statement being translated
* @param exprList List of expressions in select clause
* @param nameList List of names, one per column
* @param aliasList Collection of aliases that have been used
* already
* @param columnMonotonicityList List of monotonicity, one per column
*/
protected void extraSelectItems(
Blackboard bb,
SqlSelect select,
List<RexNode> exprList,
List<String> nameList,
Collection<String> aliasList,
List<SqlMonotonicity> columnMonotonicityList) {
}
private String deriveAlias(
final SqlNode node,
Collection<String> aliases,
final int ordinal) {
String alias = validator().deriveAlias(node, ordinal);
if ((alias == null) || aliases.contains(alias)) {
String aliasBase = (alias == null) ? "EXPR$" : alias;
for (int j = 0;; j++) {
alias = aliasBase + j;
if (!aliases.contains(alias)) {
break;
}
}
}
aliases.add(alias);
return alias;
}
/**
* Converts a WITH sub-query into a relational expression.
*/
public RelRoot convertWith(SqlWith with, boolean top) {
return convertQuery(with.body, false, top);
}
/**
* Converts a SELECT statement's parse tree into a relational expression.
*/
public RelNode convertValues(
SqlCall values,
@Nullable RelDataType targetRowType) {
final SqlValidatorScope scope = validator().getOverScope(values);
assert scope != null;
final Blackboard bb = createBlackboard(scope, null, false);
convertValuesImpl(bb, values, targetRowType);
return bb.root();
}
/**
* Converts a values clause (as in "INSERT INTO T(x,y) VALUES (1,2)") into a
* relational expression.
*
* @param bb Blackboard
* @param values Call to SQL VALUES operator
* @param targetRowType Target row type
*/
private void convertValuesImpl(
Blackboard bb,
SqlCall values,
@Nullable RelDataType targetRowType) {
// Attempt direct conversion to LogicalValues; if that fails, deal with
// fancy stuff like sub-queries below.
RelNode valuesRel =
convertRowValues(
bb,
values,
values.getOperandList(),
true,
targetRowType);
if (valuesRel != null) {
bb.setRoot(valuesRel, true);
return;
}
for (SqlNode rowConstructor1 : values.getOperandList()) {
SqlCall rowConstructor = (SqlCall) rowConstructor1;
Blackboard tmpBb = createBlackboard(bb.scope, null, false);
replaceSubQueries(tmpBb, rowConstructor,
RelOptUtil.Logic.TRUE_FALSE_UNKNOWN);
final List<Pair<RexNode, String>> exps = new ArrayList<>();
for (Ord<SqlNode> operand : Ord.zip(rowConstructor.getOperandList())) {
exps.add(
Pair.of(
tmpBb.convertExpression(operand.e),
castNonNull(validator().deriveAlias(operand.e, operand.i))));
}
RelNode in =
(null == tmpBb.root)
? LogicalValues.createOneRow(cluster)
: tmpBb.root;
relBuilder.push(in)
.project(Pair.left(exps), Pair.right(exps));
}
bb.setRoot(
relBuilder.union(true, values.getOperandList().size())
.build(),
true);
}
//~ Inner Classes ----------------------------------------------------------
/**
* A Tuple to remember all calls to Blackboard.register
*/
private static class RegisterArgs {
final RelNode rel;
final JoinRelType joinType;
final @Nullable List<RexNode> leftKeys;
RegisterArgs(RelNode rel, JoinRelType joinType, @Nullable List<RexNode> leftKeys) {
this.rel = rel;
this.joinType = joinType;
this.leftKeys = leftKeys;
}
}
/** Function that can convert a sort specification (expression, direction
* and null direction) to a target format.
*
* @param <R> Target format, such as {@link RexFieldCollation} or
* {@link RexNode}
*/
@FunctionalInterface
interface SortExpressionConverter<R> {
R convert(SqlNode node, RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection);
}
/**
* Workspace for translating an individual SELECT statement (or sub-SELECT).
*/
protected class Blackboard implements SqlRexContext, SqlVisitor<RexNode>,
InitializerContext {
/**
* Collection of {@link RelNode} objects which correspond to a SELECT
* statement.
*/
public final @Nullable SqlValidatorScope scope;
private final @Nullable Map<String, RexNode> nameToNodeMap;
public @Nullable RelNode root;
private @Nullable List<RelNode> inputs;
private final Map<CorrelationId, RexFieldAccess> mapCorrelateToRex =
new HashMap<>();
private List<RegisterArgs> registered = new ArrayList<>();
private boolean isPatternVarRef = false;
final List<RelNode> cursors = new ArrayList<>();
/**
* List of <code>IN</code> and <code>EXISTS</code> nodes inside this
* <code>SELECT</code> statement (but not inside sub-queries).
*/
private final List<SubQuery> subQueryList = new ArrayList<>();
/**
* Workspace for building aggregates.
*/
@Nullable AggConverter agg;
/**
* When converting window aggregate, we need to know if the window is
* guaranteed to be non-empty.
*/
@Nullable SqlWindow window;
/**
* Project the groupby expressions out of the root of this sub-select.
* Sub-queries can reference group by expressions projected from the
* "right" to the sub-query.
*/
private final Map<RelNode, Map<Integer, Integer>> mapRootRelToFieldProjection =
new HashMap<>();
private final List<SqlMonotonicity> columnMonotonicities =
new ArrayList<>();
private final List<RelDataTypeField> systemFieldList = new ArrayList<>();
final boolean top;
private final InitializerExpressionFactory initializerExpressionFactory =
new NullInitializerExpressionFactory();
/**
* Creates a Blackboard.
*
* @param scope Name-resolution scope for expressions validated
* within this query. Can be null if this Blackboard is
* for a leaf node, say
* @param nameToNodeMap Map which translates the expression to map a
* given parameter into, if translating expressions;
* null otherwise
* @param top Whether this is the root of the query
*/
protected Blackboard(@Nullable SqlValidatorScope scope,
@Nullable Map<String, RexNode> nameToNodeMap, boolean top) {
this.scope = scope;
this.nameToNodeMap = nameToNodeMap;
this.top = top;
}
public RelNode root() {
return requireNonNull(root, "root");
}
public SqlValidatorScope scope() {
return requireNonNull(scope, "scope");
}
public void setPatternVarRef(boolean isVarRef) {
this.isPatternVarRef = isVarRef;
}
public RexNode register(
RelNode rel,
JoinRelType joinType) {
return register(rel, joinType, null);
}
/**
* Registers a relational expression.
*
* @param rel Relational expression
* @param joinType Join type
* @param leftKeys LHS of IN clause, or null for expressions
* other than IN
* @return Expression with which to refer to the row (or partial row)
* coming from this relational expression's side of the join
*/
public RexNode register(
RelNode rel,
JoinRelType joinType,
@Nullable List<RexNode> leftKeys) {
requireNonNull(joinType, "joinType");
registered.add(new RegisterArgs(rel, joinType, leftKeys));
if (root == null) {
assert leftKeys == null : "leftKeys must be null";
setRoot(rel, false);
return rexBuilder.makeRangeReference(
root().getRowType(),
0,
false);
}
final RexNode joinCond;
final int origLeftInputCount = root.getRowType().getFieldCount();
if (leftKeys != null) {
List<RexNode> newLeftInputExprs = new ArrayList<>();
for (int i = 0; i < origLeftInputCount; i++) {
newLeftInputExprs.add(rexBuilder.makeInputRef(root(), i));
}
final List<Integer> leftJoinKeys = new ArrayList<>();
for (RexNode leftKey : leftKeys) {
int index = newLeftInputExprs.indexOf(leftKey);
if (index < 0 || joinType == JoinRelType.LEFT) {
index = newLeftInputExprs.size();
newLeftInputExprs.add(leftKey);
}
leftJoinKeys.add(index);
}
RelNode newLeftInput =
relBuilder.push(root())
.project(newLeftInputExprs)
.build();
// maintain the group by mapping in the new LogicalProject
Map<Integer, Integer> currentProjection = mapRootRelToFieldProjection.get(root());
if (currentProjection != null) {
mapRootRelToFieldProjection.put(
newLeftInput,
currentProjection);
}
setRoot(newLeftInput, false);
// right fields appear after the LHS fields.
final int rightOffset = root().getRowType().getFieldCount()
- newLeftInput.getRowType().getFieldCount();
final List<Integer> rightKeys =
Util.range(rightOffset, rightOffset + leftKeys.size());
joinCond =
RelOptUtil.createEquiJoinCondition(newLeftInput, leftJoinKeys,
rel, rightKeys, rexBuilder);
} else {
joinCond = rexBuilder.makeLiteral(true);
}
int leftFieldCount = root().getRowType().getFieldCount();
final RelNode join =
createJoin(
this,
root(),
rel,
joinCond,
joinType);
setRoot(join, false);
if (leftKeys != null
&& joinType == JoinRelType.LEFT) {
final int leftKeyCount = leftKeys.size();
int rightFieldLength = rel.getRowType().getFieldCount();
assert leftKeyCount == rightFieldLength - 1;
final int rexRangeRefLength = leftKeyCount + rightFieldLength;
RelDataType returnType =
typeFactory.createStructType(
new AbstractList<Map.Entry<String, RelDataType>>() {
@Override public Map.Entry<String, RelDataType> get(
int index) {
return join.getRowType().getFieldList()
.get(origLeftInputCount + index);
}
@Override public int size() {
return rexRangeRefLength;
}
});
return rexBuilder.makeRangeReference(
returnType,
origLeftInputCount,
false);
} else {
return rexBuilder.makeRangeReference(
rel.getRowType(),
leftFieldCount,
joinType.generatesNullsOnRight());
}
}
/**
* Re-register the {@code registered} with given root node and
* return the new root node.
*
* @param root The given root, never leaf
*
* @return new root after the registration
*/
public RelNode reRegister(RelNode root) {
setRoot(root, false);
List<RegisterArgs> registerCopy = registered;
registered = new ArrayList<>();
for (RegisterArgs reg: registerCopy) {
register(reg.rel, reg.joinType, reg.leftKeys);
}
return requireNonNull(this.root, "root");
}
/**
* Sets a new root relational expression, as the translation process
* backs its way further up the tree.
*
* @param root New root relational expression
* @param leaf Whether the relational expression is a leaf, that is,
* derived from an atomic relational expression such as a table
* name in the from clause, or the projection on top of a
* select-sub-query. In particular, relational expressions
* derived from JOIN operators are not leaves, but set
* expressions are.
*/
public void setRoot(RelNode root, boolean leaf) {
setRoot(
Collections.singletonList(root), root, root instanceof LogicalJoin);
if (leaf) {
leaves.put(root, root.getRowType().getFieldCount());
}
this.columnMonotonicities.clear();
}
private void setRoot(
List<RelNode> inputs,
@Nullable RelNode root,
boolean hasSystemFields) {
this.inputs = inputs;
this.root = root;
this.systemFieldList.clear();
if (hasSystemFields) {
this.systemFieldList.addAll(getSystemFields());
}
}
/**
* Notifies this Blackboard that the root just set using
* {@link #setRoot(RelNode, boolean)} was derived using dataset
* substitution.
*
* <p>The default implementation is not interested in such
* notifications, and does nothing.
*
* @param datasetName Dataset name
*/
public void setDataset(@Nullable String datasetName) {
}
void setRoot(List<RelNode> inputs) {
setRoot(inputs, null, false);
}
/**
* Returns an expression with which to reference a from-list item.
*
* @param qualified the alias of the from item
* @return a {@link RexFieldAccess} or {@link RexRangeRef}, or null if
* not found
*/
@Nullable Pair<RexNode, @Nullable Map<String, Integer>> lookupExp(SqlQualified qualified) {
if (nameToNodeMap != null && qualified.prefixLength == 1) {
RexNode node = nameToNodeMap.get(qualified.identifier.names.get(0));
if (node == null) {
throw new AssertionError("Unknown identifier '" + qualified.identifier
+ "' encountered while expanding expression");
}
return Pair.of(node, null);
}
final SqlNameMatcher nameMatcher =
scope().getValidator().getCatalogReader().nameMatcher();
final SqlValidatorScope.ResolvedImpl resolved =
new SqlValidatorScope.ResolvedImpl();
scope().resolve(qualified.prefix(), nameMatcher, false, resolved);
if (!(resolved.count() == 1)) {
return null;
}
final SqlValidatorScope.Resolve resolve = resolved.only();
final RelDataType rowType = resolve.rowType();
// Found in current query's from list. Find which from item.
// We assume that the order of the from clause items has been
// preserved.
final SqlValidatorScope ancestorScope = resolve.scope;
boolean isParent = ancestorScope != scope;
if ((inputs != null) && !isParent) {
final LookupContext rels =
new LookupContext(this, inputs, systemFieldList.size());
final RexNode node = lookup(resolve.path.steps().get(0).i, rels);
if (node == null) {
return null;
} else {
final Map<String, Integer> fieldOffsets = new HashMap<>();
for (RelDataTypeField f : resolve.rowType().getFieldList()) {
if (!fieldOffsets.containsKey(f.getName())) {
fieldOffsets.put(f.getName(), f.getIndex());
}
}
final Map<String, Integer> map = ImmutableMap.copyOf(fieldOffsets);
return Pair.of(node, map);
}
} else {
// We're referencing a relational expression which has not been
// converted yet. This occurs when from items are correlated,
// e.g. "select from emp as emp join emp.getDepts() as dept".
// Create a temporary expression.
DeferredLookup lookup =
new DeferredLookup(this, qualified.identifier.names.get(0));
final CorrelationId correlId = cluster.createCorrel();
mapCorrelToDeferred.put(correlId, lookup);
if (resolve.path.steps().get(0).i < 0) {
return Pair.of(rexBuilder.makeCorrel(rowType, correlId), null);
} else {
final RelDataTypeFactory.Builder builder = typeFactory.builder();
final ListScope ancestorScope1 = (ListScope)
requireNonNull(resolve.scope, "resolve.scope");
final ImmutableMap.Builder<String, Integer> fields =
ImmutableMap.builder();
int i = 0;
int offset = 0;
for (SqlValidatorNamespace c : ancestorScope1.getChildren()) {
builder.addAll(c.getRowType().getFieldList());
if (i == resolve.path.steps().get(0).i) {
for (RelDataTypeField field : c.getRowType().getFieldList()) {
fields.put(field.getName(), field.getIndex() + offset);
}
}
++i;
offset += c.getRowType().getFieldCount();
}
final RexNode c =
rexBuilder.makeCorrel(builder.uniquify().build(), correlId);
return Pair.of(c, fields.build());
}
}
}
/**
* Creates an expression with which to reference the expression whose
* offset in its from-list is {@code offset}.
*/
RexNode lookup(
int offset,
LookupContext lookupContext) {
Pair<RelNode, Integer> pair = lookupContext.findRel(offset);
return rexBuilder.makeRangeReference(
pair.left.getRowType(),
pair.right,
false);
}
@Nullable RelDataTypeField getRootField(RexInputRef inputRef) {
List<RelNode> inputs = this.inputs;
if (inputs == null) {
return null;
}
int fieldOffset = inputRef.getIndex();
for (RelNode input : inputs) {
RelDataType rowType = input.getRowType();
if (fieldOffset < rowType.getFieldCount()) {
return rowType.getFieldList().get(fieldOffset);
}
fieldOffset -= rowType.getFieldCount();
}
return null;
}
public void flatten(
List<RelNode> rels,
int systemFieldCount,
int[] start,
List<Pair<RelNode, Integer>> relOffsetList) {
for (RelNode rel : rels) {
if (leaves.containsKey(rel)) {
relOffsetList.add(
Pair.of(rel, start[0]));
start[0] += leaves.get(rel);
} else if (rel instanceof LogicalMatch) {
relOffsetList.add(
Pair.of(rel, start[0]));
start[0] += rel.getRowType().getFieldCount();
} else {
if (rel instanceof LogicalJoin
|| rel instanceof LogicalAggregate) {
start[0] += systemFieldCount;
}
flatten(
rel.getInputs(),
systemFieldCount,
start,
relOffsetList);
}
}
}
void registerSubQuery(SqlNode node, RelOptUtil.Logic logic) {
for (SubQuery subQuery : subQueryList) {
// Compare the reference to make sure the matched node has
// exact scope where it belongs.
if (node == subQuery.node) {
return;
}
}
subQueryList.add(new SubQuery(node, logic));
}
@Nullable SubQuery getSubQuery(SqlNode expr) {
for (SubQuery subQuery : subQueryList) {
// Compare the reference to make sure the matched node has
// exact scope where it belongs.
if (expr == subQuery.node) {
return subQuery;
}
}
return null;
}
ImmutableList<RelNode> retrieveCursors() {
try {
return ImmutableList.copyOf(cursors);
} finally {
cursors.clear();
}
}
@Override public RexNode convertExpression(SqlNode expr) {
// If we're in aggregation mode and this is an expression in the
// GROUP BY clause, return a reference to the field.
AggConverter agg = this.agg;
if (agg != null) {
final SqlNode expandedGroupExpr = validator().expand(expr, scope());
final int ref = agg.lookupGroupExpr(expandedGroupExpr);
if (ref >= 0) {
return rexBuilder.makeInputRef(root(), ref);
}
if (expr instanceof SqlCall) {
final RexNode rex = agg.lookupAggregates((SqlCall) expr);
if (rex != null) {
return rex;
}
}
}
// Allow the derived class chance to override the standard
// behavior for special kinds of expressions.
RexNode rex = convertExtendedExpression(expr, this);
if (rex != null) {
return rex;
}
// Sub-queries and OVER expressions are not like ordinary
// expressions.
final SqlKind kind = expr.getKind();
final SubQuery subQuery;
if (!config.isExpand()) {
final SqlCall call;
final SqlNode query;
final RelRoot root;
switch (kind) {
case IN:
case NOT_IN:
case SOME:
case ALL:
call = (SqlCall) expr;
query = call.operand(1);
if (!(query instanceof SqlNodeList)) {
root = convertQueryRecursive(query, false, null);
final SqlNode operand = call.operand(0);
List<SqlNode> nodes;
switch (operand.getKind()) {
case ROW:
nodes = ((SqlCall) operand).getOperandList();
break;
default:
nodes = ImmutableList.of(operand);
}
final ImmutableList.Builder<RexNode> builder =
ImmutableList.builder();
for (SqlNode node : nodes) {
builder.add(convertExpression(node));
}
final ImmutableList<RexNode> list = builder.build();
switch (kind) {
case IN:
return RexSubQuery.in(root.rel, list);
case NOT_IN:
return rexBuilder.makeCall(SqlStdOperatorTable.NOT,
RexSubQuery.in(root.rel, list));
case SOME:
return RexSubQuery.some(root.rel, list,
(SqlQuantifyOperator) call.getOperator());
case ALL:
return rexBuilder.makeCall(SqlStdOperatorTable.NOT,
RexSubQuery.some(root.rel, list,
negate((SqlQuantifyOperator) call.getOperator())));
default:
throw new AssertionError(kind);
}
}
break;
case EXISTS:
call = (SqlCall) expr;
query = Iterables.getOnlyElement(call.getOperandList());
root = convertQueryRecursive(query, false, null);
RelNode rel = root.rel;
while (rel instanceof Project
|| rel instanceof Sort
&& ((Sort) rel).fetch == null
&& ((Sort) rel).offset == null) {
rel = ((SingleRel) rel).getInput();
}
return RexSubQuery.exists(rel);
case UNIQUE:
call = (SqlCall) expr;
query = Iterables.getOnlyElement(call.getOperandList());
root = convertQueryRecursive(query, false, null);
return RexSubQuery.unique(root.rel);
case SCALAR_QUERY:
call = (SqlCall) expr;
query = Iterables.getOnlyElement(call.getOperandList());
root = convertQueryRecursive(query, false, null);
return RexSubQuery.scalar(root.rel);
default:
break;
}
}
switch (kind) {
case SOME:
case ALL:
case UNIQUE:
if (config.isExpand()) {
throw new RuntimeException(kind
+ " is only supported if expand = false");
}
// fall through
case CURSOR:
case IN:
case NOT_IN:
subQuery = requireNonNull(getSubQuery(expr));
rex = requireNonNull(subQuery.expr);
return StandardConvertletTable.castToValidatedType(expr, rex,
validator(), rexBuilder);
case SELECT:
case EXISTS:
case SCALAR_QUERY:
subQuery = getSubQuery(expr);
assert subQuery != null;
rex = subQuery.expr;
assert rex != null : "rex != null";
if (((kind == SqlKind.SCALAR_QUERY)
|| (kind == SqlKind.EXISTS))
&& isConvertedSubq(rex)) {
// scalar sub-query or EXISTS has been converted to a
// constant
return rex;
}
// The indicator column is the last field of the sub-query.
RexNode fieldAccess =
rexBuilder.makeFieldAccess(
rex,
rex.getType().getFieldCount() - 1);
// The indicator column will be nullable if it comes from
// the null-generating side of the join. For EXISTS, add an
// "IS TRUE" check so that the result is "BOOLEAN NOT NULL".
if (fieldAccess.getType().isNullable()
&& kind == SqlKind.EXISTS) {
fieldAccess =
rexBuilder.makeCall(
SqlStdOperatorTable.IS_NOT_NULL,
fieldAccess);
}
return fieldAccess;
case OVER:
return convertOver(this, expr);
default:
// fall through
}
// Apply standard conversions.
rex = expr.accept(this);
return requireNonNull(rex, "rex");
}
/**
* Converts an item in an ORDER BY clause inside a window (OVER) clause,
* extracting DESC, NULLS LAST and NULLS FIRST flags first.
*/
public RexFieldCollation convertSortExpression(SqlNode expr,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection) {
return convertSortExpression(expr, direction, nullDirection,
this::sortToRexFieldCollation);
}
/** Handles an item in an ORDER BY clause, passing using a converter
* function to produce the final result. */
<R> R convertSortExpression(SqlNode expr,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection,
SortExpressionConverter<R> converter) {
switch (expr.getKind()) {
case DESCENDING:
return convertSortExpression(((SqlCall) expr).operand(0),
RelFieldCollation.Direction.DESCENDING, nullDirection, converter);
case NULLS_LAST:
return convertSortExpression(((SqlCall) expr).operand(0),
direction, RelFieldCollation.NullDirection.LAST, converter);
case NULLS_FIRST:
return convertSortExpression(((SqlCall) expr).operand(0),
direction, RelFieldCollation.NullDirection.FIRST, converter);
default:
return converter.convert(expr, direction, nullDirection);
}
}
private RexFieldCollation sortToRexFieldCollation(SqlNode expr,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection) {
final Set<SqlKind> flags = EnumSet.noneOf(SqlKind.class);
if (direction == RelFieldCollation.Direction.DESCENDING) {
flags.add(SqlKind.DESCENDING);
}
switch (nullDirection) {
case UNSPECIFIED:
final RelFieldCollation.NullDirection nullDefaultDirection =
validator().config().defaultNullCollation().last(desc(direction))
? RelFieldCollation.NullDirection.LAST
: RelFieldCollation.NullDirection.FIRST;
if (nullDefaultDirection != direction.defaultNullDirection()) {
SqlKind nullDirectionSqlKind =
validator().config().defaultNullCollation().last(desc(direction))
? SqlKind.NULLS_LAST
: SqlKind.NULLS_FIRST;
flags.add(nullDirectionSqlKind);
}
break;
case FIRST:
flags.add(SqlKind.NULLS_FIRST);
break;
case LAST:
flags.add(SqlKind.NULLS_LAST);
break;
default:
break;
}
return new RexFieldCollation(convertExpression(expr), flags);
}
private RexNode sortToRex(SqlNode expr,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection) {
RexNode node = convertExpression(expr);
if (direction == RelFieldCollation.Direction.DESCENDING) {
node = relBuilder.desc(node);
}
if (nullDirection == RelFieldCollation.NullDirection.FIRST) {
node = relBuilder.nullsFirst(node);
}
if (nullDirection == RelFieldCollation.NullDirection.LAST) {
node = relBuilder.nullsLast(node);
}
return node;
}
/**
* Determines whether a RexNode corresponds to a sub-query that's been
* converted to a constant.
*
* @param rex the expression to be examined
* @return true if the expression is a dynamic parameter, a literal, or
* a literal that is being cast
*/
private boolean isConvertedSubq(RexNode rex) {
if ((rex instanceof RexLiteral)
|| (rex instanceof RexDynamicParam)) {
return true;
}
if (rex instanceof RexCall) {
RexCall call = (RexCall) rex;
if (call.getOperator() == SqlStdOperatorTable.CAST) {
RexNode operand = call.getOperands().get(0);
if (operand instanceof RexLiteral) {
return true;
}
}
}
return false;
}
@Override public int getGroupCount() {
if (agg != null) {
return agg.groupExprs.size();
}
if (window != null) {
return window.isAlwaysNonEmpty() ? 1 : 0;
}
return -1;
}
@Override public RexBuilder getRexBuilder() {
return rexBuilder;
}
@Override public SqlNode validateExpression(RelDataType rowType, SqlNode expr) {
return SqlValidatorUtil.validateExprWithRowType(
catalogReader.nameMatcher().isCaseSensitive(), opTab,
typeFactory, rowType, expr).left;
}
@Override public RexRangeRef getSubQueryExpr(SqlCall call) {
final SubQuery subQuery = getSubQuery(call);
assert subQuery != null;
return (RexRangeRef) requireNonNull(subQuery.expr, () -> "subQuery.expr for " + call);
}
@Override public RelDataTypeFactory getTypeFactory() {
return typeFactory;
}
@Override public InitializerExpressionFactory getInitializerExpressionFactory() {
return initializerExpressionFactory;
}
@Override public SqlValidator getValidator() {
return validator();
}
@Override public RexNode convertLiteral(SqlLiteral literal) {
return exprConverter.convertLiteral(this, literal);
}
public RexNode convertInterval(SqlIntervalQualifier intervalQualifier) {
return exprConverter.convertInterval(this, intervalQualifier);
}
@Override public RexNode visit(SqlLiteral literal) {
return exprConverter.convertLiteral(this, literal);
}
@Override public RexNode visit(SqlCall call) {
if (agg != null) {
final SqlOperator op = call.getOperator();
if (window == null
&& (op.isAggregator()
|| op.getKind() == SqlKind.FILTER
|| op.getKind() == SqlKind.WITHIN_DISTINCT
|| op.getKind() == SqlKind.WITHIN_GROUP)) {
return requireNonNull(agg.lookupAggregates(call),
() -> "agg.lookupAggregates for call " + call);
}
}
return exprConverter.convertCall(this,
new SqlCallBinding(validator(), scope, call).permutedCall());
}
@Override public RexNode visit(SqlNodeList nodeList) {
throw new UnsupportedOperationException();
}
@Override public RexNode visit(SqlIdentifier id) {
return convertIdentifier(this, id);
}
@Override public RexNode visit(SqlDataTypeSpec type) {
throw new UnsupportedOperationException();
}
@Override public RexNode visit(SqlDynamicParam param) {
return convertDynamicParam(param);
}
@Override public RexNode visit(SqlIntervalQualifier intervalQualifier) {
return convertInterval(intervalQualifier);
}
public List<SqlMonotonicity> getColumnMonotonicities() {
return columnMonotonicities;
}
}
private static SqlQuantifyOperator negate(SqlQuantifyOperator operator) {
assert operator.kind == SqlKind.ALL;
return SqlStdOperatorTable.some(operator.comparisonKind.negateNullSafe());
}
/** Deferred lookup. */
private static class DeferredLookup {
Blackboard bb;
String originalRelName;
DeferredLookup(
Blackboard bb,
String originalRelName) {
this.bb = bb;
this.originalRelName = originalRelName;
}
public RexFieldAccess getFieldAccess(CorrelationId name) {
return (RexFieldAccess) requireNonNull(
bb.mapCorrelateToRex.get(name),
() -> "Correlation " + name + " is not found");
}
public String getOriginalRelName() {
return originalRelName;
}
}
/**
* A default implementation of SubQueryConverter that does no conversion.
*/
private static class NoOpSubQueryConverter implements SubQueryConverter {
@Override public boolean canConvertSubQuery() {
return false;
}
@Override public RexNode convertSubQuery(
SqlCall subQuery,
SqlToRelConverter parentConverter,
boolean isExists,
boolean isExplain) {
throw new IllegalArgumentException();
}
}
/**
* Converts expressions to aggregates.
*
* <p>Consider the expression
*
* <blockquote>
* {@code SELECT deptno, SUM(2 * sal) FROM emp GROUP BY deptno}
* </blockquote>
*
* <p>Then:
*
* <ul>
* <li>groupExprs = {SqlIdentifier(deptno)}</li>
* <li>convertedInputExprs = {RexInputRef(deptno), 2 *
* RefInputRef(sal)}</li>
* <li>inputRefs = {RefInputRef(#0), RexInputRef(#1)}</li>
* <li>aggCalls = {AggCall(SUM, {1})}</li>
* </ul>
*/
protected class AggConverter implements SqlVisitor<Void> {
private final Blackboard bb;
public final @Nullable AggregatingSelectScope aggregatingSelectScope;
private final Map<String, String> nameMap = new HashMap<>();
/**
* The group-by expressions, in {@link SqlNode} format.
*/
private final SqlNodeList groupExprs =
new SqlNodeList(SqlParserPos.ZERO);
/**
* The auxiliary group-by expressions.
*/
private final Map<SqlNode, Ord<AuxiliaryConverter>> auxiliaryGroupExprs =
new HashMap<>();
/**
* Input expressions for the group columns and aggregates, in
* {@link RexNode} format. The first elements of the list correspond to the
* elements in {@link #groupExprs}; the remaining elements are for
* aggregates. The right field of each pair is the name of the expression,
* where the expressions are simple mappings to input fields.
*/
private final List<Pair<RexNode, @Nullable String>> convertedInputExprs =
new ArrayList<>();
/** Expressions to be evaluated as rows are being placed into the
* aggregate's hash table. This is when group functions such as TUMBLE
* cause rows to be expanded. */
private final List<AggregateCall> aggCalls = new ArrayList<>();
private final Map<SqlNode, RexNode> aggMapping = new HashMap<>();
private final Map<AggregateCall, RexNode> aggCallMapping =
new HashMap<>();
/** Whether we are directly inside a windowed aggregate. */
private boolean inOver = false;
AggConverter(Blackboard bb, @Nullable AggregatingSelectScope aggregatingSelectScope) {
this.bb = bb;
this.aggregatingSelectScope = aggregatingSelectScope;
}
/**
* Creates an AggConverter.
*
* <p>The <code>select</code> parameter provides enough context to name
* aggregate calls which are top-level select list items.
*
* @param bb Blackboard
* @param select Query being translated; provides context to give
*/
public AggConverter(Blackboard bb, SqlSelect select) {
this(bb,
(AggregatingSelectScope) bb.getValidator().getSelectScope(select));
// Collect all expressions used in the select list so that aggregate
// calls can be named correctly.
final SqlNodeList selectList = select.getSelectList();
for (int i = 0; i < selectList.size(); i++) {
SqlNode selectItem = selectList.get(i);
String name = null;
if (SqlUtil.isCallTo(
selectItem,
SqlStdOperatorTable.AS)) {
final SqlCall call = (SqlCall) selectItem;
selectItem = call.operand(0);
name = call.operand(1).toString();
}
if (name == null) {
name = validator().deriveAlias(selectItem, i);
assert name != null : "alias must not be null for " + selectItem + ", i=" + i;
}
nameMap.put(selectItem.toString(), name);
}
}
public int addGroupExpr(SqlNode expr) {
int ref = lookupGroupExpr(expr);
if (ref >= 0) {
return ref;
}
final int index = groupExprs.size();
groupExprs.add(expr);
String name = nameMap.get(expr.toString());
RexNode convExpr = bb.convertExpression(expr);
addExpr(convExpr, name);
if (expr instanceof SqlCall) {
SqlCall call = (SqlCall) expr;
for (Pair<SqlNode, AuxiliaryConverter> p
: SqlStdOperatorTable.convertGroupToAuxiliaryCalls(call)) {
addAuxiliaryGroupExpr(p.left, index, p.right);
}
}
return index;
}
void addAuxiliaryGroupExpr(SqlNode node, int index,
AuxiliaryConverter converter) {
for (SqlNode node2 : auxiliaryGroupExprs.keySet()) {
if (node2.equalsDeep(node, Litmus.IGNORE)) {
return;
}
}
auxiliaryGroupExprs.put(node, Ord.of(index, converter));
}
/**
* Adds an expression, deducing an appropriate name if possible.
*
* @param expr Expression
* @param name Suggested name
*/
private void addExpr(RexNode expr, @Nullable String name) {
if ((name == null) && (expr instanceof RexInputRef)) {
final int i = ((RexInputRef) expr).getIndex();
name = bb.root().getRowType().getFieldList().get(i).getName();
}
if (Pair.right(convertedInputExprs).contains(name)) {
// In case like 'SELECT ... GROUP BY x, y, x', don't add
// name 'x' twice.
name = null;
}
convertedInputExprs.add(Pair.of(expr, name));
}
@Override public Void visit(SqlIdentifier id) {
return null;
}
@Override public Void visit(SqlNodeList nodeList) {
for (int i = 0; i < nodeList.size(); i++) {
nodeList.get(i).accept(this);
}
return null;
}
@Override public Void visit(SqlLiteral lit) {
return null;
}
@Override public Void visit(SqlDataTypeSpec type) {
return null;
}
@Override public Void visit(SqlDynamicParam param) {
return null;
}
@Override public Void visit(SqlIntervalQualifier intervalQualifier) {
return null;
}
@Override public Void visit(SqlCall call) {
switch (call.getKind()) {
case FILTER:
case IGNORE_NULLS:
case RESPECT_NULLS:
case WITHIN_DISTINCT:
case WITHIN_GROUP:
translateAgg(call);
return null;
case SELECT:
// rchen 2006-10-17:
// for now do not detect aggregates in sub-queries.
return null;
default:
break;
}
final boolean prevInOver = inOver;
// Ignore window aggregates and ranking functions (associated with OVER
// operator). However, do not ignore nested window aggregates.
if (call.getOperator().getKind() == SqlKind.OVER) {
// Track aggregate nesting levels only within an OVER operator.
List<SqlNode> operandList = call.getOperandList();
assert operandList.size() == 2;
// Ignore the top level window aggregates and ranking functions
// positioned as the first operand of a OVER operator
inOver = true;
operandList.get(0).accept(this);
// Normal translation for the second operand of a OVER operator
inOver = false;
operandList.get(1).accept(this);
return null;
}
// Do not translate the top level window aggregate. Only do so for
// nested aggregates, if present
if (call.getOperator().isAggregator()) {
if (inOver) {
// Add the parent aggregate level before visiting its children
inOver = false;
} else {
// We're beyond the one ignored level
translateAgg(call);
return null;
}
}
for (SqlNode operand : call.getOperandList()) {
// Operands are occasionally null, e.g. switched CASE arg 0.
if (operand != null) {
operand.accept(this);
}
}
// Remove the parent aggregate level after visiting its children
inOver = prevInOver;
return null;
}
private void translateAgg(SqlCall call) {
translateAgg(call, null, null, null, false, call);
}
private void translateAgg(SqlCall call, @Nullable SqlNode filter,
@Nullable SqlNodeList distinctList, @Nullable SqlNodeList orderList,
boolean ignoreNulls, SqlCall outerCall) {
assert bb.agg == this;
assert outerCall != null;
final List<SqlNode> operands = call.getOperandList();
final SqlParserPos pos = call.getParserPosition();
final SqlCall call2;
switch (call.getKind()) {
case FILTER:
assert filter == null;
translateAgg(call.operand(0), call.operand(1), distinctList, orderList,
ignoreNulls, outerCall);
return;
case WITHIN_DISTINCT:
assert orderList == null;
translateAgg(call.operand(0), filter, call.operand(1), orderList,
ignoreNulls, outerCall);
return;
case WITHIN_GROUP:
assert orderList == null;
translateAgg(call.operand(0), filter, distinctList, call.operand(1),
ignoreNulls, outerCall);
return;
case IGNORE_NULLS:
ignoreNulls = true;
// fall through
case RESPECT_NULLS:
translateAgg(call.operand(0), filter, distinctList, orderList,
ignoreNulls, outerCall);
return;
case COUNTIF:
// COUNTIF(b) ==> COUNT(*) FILTER (WHERE b)
// COUNTIF(b) FILTER (WHERE b2) ==> COUNT(*) FILTER (WHERE b2 AND b)
call2 =
SqlStdOperatorTable.COUNT.createCall(pos, SqlIdentifier.star(pos));
final SqlNode filter2 = SqlUtil.andExpressions(filter, call.operand(0));
translateAgg(call2, filter2, distinctList, orderList, ignoreNulls,
outerCall);
return;
case STRING_AGG:
// Translate "STRING_AGG(s, sep ORDER BY x, y)"
// as if it were "LISTAGG(s, sep) WITHIN GROUP (ORDER BY x, y)";
// and "STRING_AGG(s, sep)" as "LISTAGG(s, sep)".
final List<SqlNode> operands2;
if (!operands.isEmpty()
&& Util.last(operands) instanceof SqlNodeList) {
orderList = (SqlNodeList) Util.last(operands);
operands2 = Util.skipLast(operands);
} else {
operands2 = operands;
}
call2 =
SqlStdOperatorTable.LISTAGG.createCall(
call.getFunctionQuantifier(), pos, operands2);
translateAgg(call2, filter, distinctList, orderList, ignoreNulls,
outerCall);
return;
case GROUP_CONCAT:
// Translate "GROUP_CONCAT(s ORDER BY x, y SEPARATOR ',')"
// as if it were "LISTAGG(s, ',') WITHIN GROUP (ORDER BY x, y)".
// To do this, build a list of operands without ORDER BY with with sep.
operands2 = new ArrayList<>(operands);
final SqlNode separator;
if (!operands2.isEmpty()
&& Util.last(operands2).getKind() == SqlKind.SEPARATOR) {
final SqlCall sepCall =
(SqlCall) operands2.remove(operands.size() - 1);
separator = sepCall.operand(0);
} else {
separator = null;
}
if (!operands2.isEmpty()
&& Util.last(operands2) instanceof SqlNodeList) {
orderList = (SqlNodeList) operands2.remove(operands2.size() - 1);
}
if (separator != null) {
operands2.add(separator);
}
call2 =
SqlStdOperatorTable.LISTAGG.createCall(
call.getFunctionQuantifier(), pos, operands2);
translateAgg(call2, filter, distinctList, orderList, ignoreNulls,
outerCall);
return;
case ARRAY_AGG:
case ARRAY_CONCAT_AGG:
// Translate "ARRAY_AGG(s ORDER BY x, y)"
// as if it were "ARRAY_AGG(s) WITHIN GROUP (ORDER BY x, y)";
// similarly "ARRAY_CONCAT_AGG".
if (!operands.isEmpty()
&& Util.last(operands) instanceof SqlNodeList) {
orderList = (SqlNodeList) Util.last(operands);
call2 =
call.getOperator().createCall(
call.getFunctionQuantifier(), pos, Util.skipLast(operands));
translateAgg(call2, filter, distinctList, orderList, ignoreNulls,
outerCall);
return;
}
// "ARRAY_AGG" and "ARRAY_CONCAT_AGG" without "ORDER BY"
// are handled normally; fall through.
default:
break;
}
final List<Integer> args = new ArrayList<>();
int filterArg = -1;
final ImmutableBitSet distinctKeys;
try {
// switch out of agg mode
bb.agg = null;
for (SqlNode operand : call.getOperandList()) {
// special case for COUNT(*): delete the *
if (operand instanceof SqlIdentifier) {
SqlIdentifier id = (SqlIdentifier) operand;
if (id.isStar()) {
assert call.operandCount() == 1;
assert args.isEmpty();
break;
}
}
RexNode convertedExpr = bb.convertExpression(operand);
args.add(lookupOrCreateGroupExpr(convertedExpr));
}
if (filter != null) {
RexNode convertedExpr = bb.convertExpression(filter);
if (convertedExpr.getType().isNullable()) {
convertedExpr =
rexBuilder.makeCall(SqlStdOperatorTable.IS_TRUE, convertedExpr);
}
filterArg = lookupOrCreateGroupExpr(convertedExpr);
}
if (distinctList == null) {
distinctKeys = null;
} else {
final ImmutableBitSet.Builder distinctBuilder =
ImmutableBitSet.builder();
for (SqlNode distinct : distinctList) {
RexNode e = bb.convertExpression(distinct);
assert e != null;
distinctBuilder.set(lookupOrCreateGroupExpr(e));
}
distinctKeys = distinctBuilder.build();
}
} finally {
// switch back into agg mode
bb.agg = this;
}
SqlAggFunction aggFunction =
(SqlAggFunction) call.getOperator();
final RelDataType type = validator().deriveType(bb.scope(), call);
boolean distinct = false;
SqlLiteral quantifier = call.getFunctionQuantifier();
if ((null != quantifier)
&& (quantifier.getValue() == SqlSelectKeyword.DISTINCT)) {
distinct = true;
}
boolean approximate = false;
if (aggFunction == SqlStdOperatorTable.APPROX_COUNT_DISTINCT) {
aggFunction = SqlStdOperatorTable.COUNT;
distinct = true;
approximate = true;
}
final RelCollation collation;
if (orderList == null || orderList.size() == 0) {
collation = RelCollations.EMPTY;
} else {
try {
// switch out of agg mode
bb.agg = null;
collation = RelCollations.of(
orderList.stream()
.map(order ->
bb.convertSortExpression(order,
RelFieldCollation.Direction.ASCENDING,
RelFieldCollation.NullDirection.UNSPECIFIED,
this::sortToFieldCollation))
.collect(Collectors.toList()));
} finally {
// switch back into agg mode
bb.agg = this;
}
}
final AggregateCall aggCall =
AggregateCall.create(
aggFunction,
distinct,
approximate,
ignoreNulls,
args,
filterArg,
distinctKeys,
collation,
type,
nameMap.get(outerCall.toString()));
RexNode rex =
rexBuilder.addAggCall(
aggCall,
groupExprs.size(),
aggCalls,
aggCallMapping,
i -> convertedInputExprs.get(i).left.getType().isNullable());
aggMapping.put(outerCall, rex);
}
private RelFieldCollation sortToFieldCollation(SqlNode expr,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection) {
final RexNode node = bb.convertExpression(expr);
final int fieldIndex = lookupOrCreateGroupExpr(node);
if (nullDirection == RelFieldCollation.NullDirection.UNSPECIFIED) {
nullDirection = direction.defaultNullDirection();
}
return new RelFieldCollation(fieldIndex, direction, nullDirection);
}
private int lookupOrCreateGroupExpr(RexNode expr) {
int index = 0;
for (RexNode convertedInputExpr : Pair.left(convertedInputExprs)) {
if (expr.equals(convertedInputExpr)) {
return index;
}
++index;
}
// not found -- add it
addExpr(expr, null);
return index;
}
/**
* If an expression is structurally identical to one of the group-by
* expressions, returns a reference to the expression, otherwise returns
* null.
*/
public int lookupGroupExpr(SqlNode expr) {
for (int i = 0; i < groupExprs.size(); i++) {
SqlNode groupExpr = groupExprs.get(i);
if (expr.equalsDeep(groupExpr, Litmus.IGNORE)) {
return i;
}
}
return -1;
}
public @Nullable RexNode lookupAggregates(SqlCall call) {
// assert call.getOperator().isAggregator();
assert bb.agg == this;
for (Map.Entry<SqlNode, Ord<AuxiliaryConverter>> e
: auxiliaryGroupExprs.entrySet()) {
if (call.equalsDeep(e.getKey(), Litmus.IGNORE)) {
AuxiliaryConverter converter = e.getValue().e;
final int groupOrdinal = e.getValue().i;
return converter.convert(rexBuilder,
convertedInputExprs.get(groupOrdinal).left,
rexBuilder.makeInputRef(castNonNull(bb.root), groupOrdinal));
}
}
return aggMapping.get(call);
}
public List<Pair<RexNode, @Nullable String>> getPreExprs() {
return convertedInputExprs;
}
public List<AggregateCall> getAggCalls() {
return aggCalls;
}
public RelDataTypeFactory getTypeFactory() {
return typeFactory;
}
}
/**
* Context to find a relational expression to a field offset.
*/
private static class LookupContext {
private final List<Pair<RelNode, Integer>> relOffsetList =
new ArrayList<>();
/**
* Creates a LookupContext with multiple input relational expressions.
*
* @param bb Context for translating this sub-query
* @param rels Relational expressions
* @param systemFieldCount Number of system fields
*/
LookupContext(Blackboard bb, List<RelNode> rels, int systemFieldCount) {
bb.flatten(rels, systemFieldCount, new int[]{0}, relOffsetList);
}
/**
* Returns the relational expression with a given offset, and the
* ordinal in the combined row of its first field.
*
* <p>For example, in {@code Emp JOIN Dept}, findRel(1) returns the
* relational expression for {@code Dept} and offset 6 (because
* {@code Emp} has 6 fields, therefore the first field of {@code Dept}
* is field 6.
*
* @param offset Offset of relational expression in FROM clause
* @return Relational expression and the ordinal of its first field
*/
Pair<RelNode, Integer> findRel(int offset) {
return relOffsetList.get(offset);
}
}
/**
* Shuttle which walks over a tree of {@link RexNode}s and applies 'over' to
* all agg functions.
*
* <p>This is necessary because the returned expression is not necessarily a
* call to an agg function. For example,
*
* <blockquote><code>AVG(x)</code></blockquote>
*
* <p>becomes
*
* <blockquote><code>SUM(x) / COUNT(x)</code></blockquote>
*
* <p>Any aggregate functions are converted to calls to the internal <code>
* $Histogram</code> aggregation function and accessors such as <code>
* $HistogramMin</code>; for example,
*
* <blockquote><code>MIN(x), MAX(x)</code></blockquote>
*
* <p>are converted to
*
* <blockquote><code>$HistogramMin($Histogram(x)),
* $HistogramMax($Histogram(x))</code></blockquote>
*
* <p>Common sub-expression elimination will ensure that only one histogram is
* computed.
*/
private class HistogramShuttle extends RexShuttle {
/**
* Whether to convert calls to MIN(x) to HISTOGRAM_MIN(HISTOGRAM(x)).
* Histograms allow rolling computation, but require more space.
*/
static final boolean ENABLE_HISTOGRAM_AGG = false;
private final ImmutableList<RexNode> partitionKeys;
private final ImmutableList<RexNode> orderKeys;
private final RexWindowBound lowerBound;
private final RexWindowBound upperBound;
private final boolean rows;
private final boolean allowPartial;
private final boolean distinct;
private final boolean ignoreNulls;
HistogramShuttle(ImmutableList<RexNode> partitionKeys,
ImmutableList<RexNode> orderKeys, boolean rows,
RexWindowBound lowerBound, RexWindowBound upperBound,
boolean allowPartial, boolean distinct, boolean ignoreNulls) {
this.partitionKeys = partitionKeys;
this.orderKeys = orderKeys;
this.lowerBound = lowerBound;
this.upperBound = upperBound;
this.rows = rows;
this.allowPartial = allowPartial;
this.distinct = distinct;
this.ignoreNulls = ignoreNulls;
}
@Override public RexNode visitCall(RexCall call) {
final SqlOperator op = call.getOperator();
if (!(op instanceof SqlAggFunction)) {
return super.visitCall(call);
}
final SqlAggFunction aggOp = (SqlAggFunction) op;
final RelDataType type = call.getType();
List<RexNode> exprs = call.getOperands();
SqlFunction histogramOp = !ENABLE_HISTOGRAM_AGG
? null
: getHistogramOp(aggOp);
if (histogramOp != null) {
final RelDataType histogramType = computeHistogramType(type);
// For DECIMAL, since it's already represented as a bigint we
// want to do a reinterpretCast instead of a cast to avoid
// losing any precision.
boolean reinterpretCast =
type.getSqlTypeName() == SqlTypeName.DECIMAL;
// Replace original expression with CAST of not one
// of the supported types
if (histogramType != type) {
exprs = new ArrayList<>(exprs);
exprs.set(
0,
reinterpretCast
? rexBuilder.makeReinterpretCast(histogramType, exprs.get(0),
rexBuilder.makeLiteral(false))
: rexBuilder.makeCast(histogramType, exprs.get(0)));
}
RexNode over =
relBuilder.aggregateCall(SqlStdOperatorTable.HISTOGRAM_AGG, exprs)
.distinct(distinct)
.ignoreNulls(ignoreNulls)
.over()
.partitionBy(partitionKeys)
.orderBy(orderKeys)
.let(c ->
rows ? c.rowsBetween(lowerBound, upperBound)
: c.rangeBetween(lowerBound, upperBound))
.allowPartial(allowPartial)
.toRex();
RexNode histogramCall =
rexBuilder.makeCall(
histogramType,
histogramOp,
ImmutableList.of(over));
// If needed, post Cast result back to original
// type.
if (histogramType != type) {
if (reinterpretCast) {
histogramCall =
rexBuilder.makeReinterpretCast(
type,
histogramCall,
rexBuilder.makeLiteral(false));
} else {
histogramCall =
rexBuilder.makeCast(type, histogramCall);
}
}
return histogramCall;
} else {
boolean needSum0 = aggOp == SqlStdOperatorTable.SUM
&& type.isNullable();
SqlAggFunction aggOpToUse =
needSum0 ? SqlStdOperatorTable.SUM0
: aggOp;
return relBuilder.aggregateCall(aggOpToUse, exprs)
.distinct(distinct)
.ignoreNulls(ignoreNulls)
.over()
.partitionBy(partitionKeys)
.orderBy(orderKeys)
.let(c ->
rows ? c.rowsBetween(lowerBound, upperBound)
: c.rangeBetween(lowerBound, upperBound))
.allowPartial(allowPartial)
.nullWhenCountZero(needSum0)
.toRex();
}
}
/**
* Returns the histogram operator corresponding to a given aggregate
* function.
*
* <p>For example, <code>getHistogramOp
*({@link SqlStdOperatorTable#MIN}}</code> returns
* {@link SqlStdOperatorTable#HISTOGRAM_MIN}.
*
* @param aggFunction An aggregate function
* @return Its histogram function, or null
*/
@Nullable SqlFunction getHistogramOp(SqlAggFunction aggFunction) {
if (aggFunction == SqlStdOperatorTable.MIN) {
return SqlStdOperatorTable.HISTOGRAM_MIN;
} else if (aggFunction == SqlStdOperatorTable.MAX) {
return SqlStdOperatorTable.HISTOGRAM_MAX;
} else if (aggFunction == SqlStdOperatorTable.FIRST_VALUE) {
return SqlStdOperatorTable.HISTOGRAM_FIRST_VALUE;
} else if (aggFunction == SqlStdOperatorTable.LAST_VALUE) {
return SqlStdOperatorTable.HISTOGRAM_LAST_VALUE;
} else {
return null;
}
}
/**
* Returns the type for a histogram function. It is either the actual
* type or an an approximation to it.
*/
private RelDataType computeHistogramType(RelDataType type) {
if (SqlTypeUtil.isExactNumeric(type)
&& type.getSqlTypeName() != SqlTypeName.BIGINT) {
return typeFactory.createSqlType(SqlTypeName.BIGINT);
} else if (SqlTypeUtil.isApproximateNumeric(type)
&& type.getSqlTypeName() != SqlTypeName.DOUBLE) {
return typeFactory.createSqlType(SqlTypeName.DOUBLE);
} else {
return type;
}
}
}
/** A sub-query, whether it needs to be translated using 2- or 3-valued
* logic. */
private static class SubQuery {
final SqlNode node;
final RelOptUtil.Logic logic;
@Nullable RexNode expr;
private SubQuery(SqlNode node, RelOptUtil.Logic logic) {
this.node = node;
this.logic = logic;
}
}
/**
* Visitor that collects all aggregate functions in a {@link SqlNode} tree.
*/
private static class AggregateFinder extends SqlBasicVisitor<Void> {
final SqlNodeList list = new SqlNodeList(SqlParserPos.ZERO);
final SqlNodeList filterList = new SqlNodeList(SqlParserPos.ZERO);
final SqlNodeList distinctList = new SqlNodeList(SqlParserPos.ZERO);
final SqlNodeList orderList = new SqlNodeList(SqlParserPos.ZERO);
@Override public Void visit(SqlCall call) {
// ignore window aggregates and ranking functions (associated with OVER operator)
if (call.getOperator().getKind() == SqlKind.OVER) {
return null;
}
if (call.getOperator().getKind() == SqlKind.FILTER) {
// the WHERE in a FILTER must be tracked too so we can call replaceSubQueries on it.
// see https://issues.apache.org/jira/browse/CALCITE-1910
final SqlNode aggCall = call.getOperandList().get(0);
final SqlNode whereCall = call.getOperandList().get(1);
list.add(aggCall);
filterList.add(whereCall);
return null;
}
if (call.getOperator().getKind() == SqlKind.WITHIN_DISTINCT) {
final SqlNode aggCall = call.getOperandList().get(0);
final SqlNodeList distinctList =
(SqlNodeList) call.getOperandList().get(1);
list.add(aggCall);
distinctList.getList().forEach(this.distinctList::add);
return null;
}
if (call.getOperator().getKind() == SqlKind.WITHIN_GROUP) {
final SqlNode aggCall = call.getOperandList().get(0);
final SqlNodeList orderList = (SqlNodeList) call.getOperandList().get(1);
list.add(aggCall);
this.orderList.addAll(orderList);
return null;
}
if (call.getOperator().isAggregator()) {
list.add(call);
return null;
}
// Don't traverse into sub-queries, even if they contain aggregate
// functions.
if (call instanceof SqlSelect) {
return null;
}
return call.getOperator().acceptCall(this, call);
}
}
/** Use of a row as a correlating variable by a given relational
* expression. */
private static class CorrelationUse {
private final CorrelationId id;
private final ImmutableBitSet requiredColumns;
/** The relational expression that uses the variable. */
private final RelNode r;
CorrelationUse(CorrelationId id, ImmutableBitSet requiredColumns,
RelNode r) {
this.id = id;
this.requiredColumns = requiredColumns;
this.r = r;
}
}
/** Creates a builder for a {@link Config}. */
@Deprecated // to be removed before 2.0
public static ConfigBuilder configBuilder() {
return new ConfigBuilder();
}
/** Returns a default {@link Config}. */
public static Config config() {
return CONFIG;
}
/**
* Interface to define the configuration for a SqlToRelConverter.
* Provides methods to set each configuration option.
*
* @see SqlToRelConverter#CONFIG
*/
public interface Config {
/** Returns the {@code decorrelationEnabled} option. Controls whether to
* disable sub-query decorrelation when needed. e.g. if outer joins are not
* supported. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean isDecorrelationEnabled();
/** Sets {@link #isDecorrelationEnabled()}. */
Config withDecorrelationEnabled(boolean decorrelationEnabled);
/** Returns the {@code trimUnusedFields} option. Controls whether to trim
* unused fields as part of the conversion process. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(false)
boolean isTrimUnusedFields();
/** Sets {@link #isTrimUnusedFields()}. */
Config withTrimUnusedFields(boolean trimUnusedFields);
/** Returns the {@code createValuesRel} option. Controls whether instances
* of {@link org.apache.calcite.rel.logical.LogicalValues} are generated.
* These may not be supported by all physical implementations. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean isCreateValuesRel();
/** Sets {@link #isCreateValuesRel()}. */
Config withCreateValuesRel(boolean createValuesRel);
/** Returns the {@code explain} option. Describes whether the current
* statement is part of an EXPLAIN PLAN statement. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(false)
boolean isExplain();
/** Sets {@link #isExplain()}. */
Config withExplain(boolean explain);
/** Returns the {@code expand} option. Controls whether to expand
* sub-queries. If false, each sub-query becomes a
* {@link org.apache.calcite.rex.RexSubQuery}. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean isExpand();
/** Sets {@link #isExpand()}. */
Config withExpand(boolean expand);
/** Returns the {@code inSubQueryThreshold} option,
* default {@link #DEFAULT_IN_SUB_QUERY_THRESHOLD}. Controls the list size
* threshold under which {@link #convertInToOr} is used. Lists of this size
* or greater will instead be converted to use a join against an inline
* table ({@link org.apache.calcite.rel.logical.LogicalValues}) rather than
* a predicate. A threshold of 0 forces usage of an inline table in all
* cases; a threshold of {@link Integer#MAX_VALUE} forces usage of OR in all
* cases. */
@ImmutableBeans.Property
@ImmutableBeans.IntDefault(DEFAULT_IN_SUB_QUERY_THRESHOLD)
int getInSubQueryThreshold();
/** Sets {@link #getInSubQueryThreshold()}. */
Config withInSubQueryThreshold(int threshold);
/** Returns whether to remove Sort operator for a sub-query
* if the Sort has no offset and fetch limit attributes.
* Because the remove does not change the semantics,
* in many cases this is a promotion.
* Default is true. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean isRemoveSortInSubQuery();
/** Sets {@link #isRemoveSortInSubQuery()}. */
Config withRemoveSortInSubQuery(boolean removeSortInSubQuery);
/** Returns the factory to create {@link RelBuilder}, never null. Default is
* {@link RelFactories#LOGICAL_BUILDER}. */
@ImmutableBeans.Property
RelBuilderFactory getRelBuilderFactory();
/** Sets {@link #getRelBuilderFactory()}. */
Config withRelBuilderFactory(RelBuilderFactory factory);
/** Returns a function that takes a {@link RelBuilder.Config} and returns
* another. Default is the identity function. */
@ImmutableBeans.Property
UnaryOperator<RelBuilder.Config> getRelBuilderConfigTransform();
/** Sets {@link #getRelBuilderConfigTransform()}.
*
* @see #addRelBuilderConfigTransform */
Config withRelBuilderConfigTransform(
UnaryOperator<RelBuilder.Config> transform);
/** Adds a transform to {@link #getRelBuilderConfigTransform()}. */
default Config addRelBuilderConfigTransform(
UnaryOperator<RelBuilder.Config> transform) {
return withRelBuilderConfigTransform(
getRelBuilderConfigTransform().andThen(transform)::apply);
}
/** Returns the hint strategies used to decide how the hints are propagated to
* the relational expressions. Default is
* {@link HintStrategyTable#EMPTY}. */
@ImmutableBeans.Property
HintStrategyTable getHintStrategyTable();
/** Sets {@link #getHintStrategyTable()}. */
Config withHintStrategyTable(HintStrategyTable hintStrategyTable);
}
/** Builder for a {@link Config}. */
@Deprecated // to be removed before 2.0
public static class ConfigBuilder {
private Config config;
private ConfigBuilder() {
config = CONFIG;
}
/** Sets configuration identical to a given {@link Config}. */
public ConfigBuilder withConfig(Config config) {
this.config = config;
return this;
}
public ConfigBuilder withDecorrelationEnabled(boolean enabled) {
return withConfig(config.withDecorrelationEnabled(enabled));
}
public ConfigBuilder withTrimUnusedFields(boolean trimUnusedFields) {
return withConfig(config.withTrimUnusedFields(trimUnusedFields));
}
public ConfigBuilder withCreateValuesRel(boolean createValuesRel) {
return withConfig(config.withCreateValuesRel(createValuesRel));
}
public ConfigBuilder withExplain(boolean explain) {
return withConfig(config.withExplain(explain));
}
public ConfigBuilder withExpand(boolean expand) {
return withConfig(config.withExpand(expand));
}
public ConfigBuilder withRemoveSortInSubQuery(boolean removeSortInSubQuery) {
return withConfig(config.withRemoveSortInSubQuery(removeSortInSubQuery));
}
/** Whether to push down join conditions; default true. */
public ConfigBuilder withPushJoinCondition(boolean pushJoinCondition) {
return withRelBuilderConfigTransform(c ->
c.withPushJoinCondition(pushJoinCondition));
}
public ConfigBuilder withInSubqueryThreshold(int inSubQueryThreshold) {
return withInSubQueryThreshold(inSubQueryThreshold);
}
public ConfigBuilder withInSubQueryThreshold(int inSubQueryThreshold) {
return withConfig(config.withInSubQueryThreshold(inSubQueryThreshold));
}
public ConfigBuilder withRelBuilderConfigTransform(
UnaryOperator<RelBuilder.Config> configTransform) {
return withConfig(config.addRelBuilderConfigTransform(configTransform));
}
public ConfigBuilder withRelBuilderFactory(
RelBuilderFactory relBuilderFactory) {
return withConfig(config.withRelBuilderFactory(relBuilderFactory));
}
public ConfigBuilder withHintStrategyTable(
HintStrategyTable hintStrategyTable) {
return withConfig(config.withHintStrategyTable(hintStrategyTable));
}
/** Builds a {@link Config}. */
public Config build() {
return config;
}
}
}