| /* |
| * 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.drill.exec.planner.logical; |
| |
| import org.apache.drill.shaded.guava.com.google.common.collect.Lists; |
| import org.apache.calcite.linq4j.Ord; |
| import org.apache.calcite.util.BitSets; |
| import org.apache.drill.common.expression.ExpressionPosition; |
| import org.apache.drill.common.expression.FieldReference; |
| import org.apache.drill.common.expression.FunctionCall; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.expression.ValueExpressions; |
| import org.apache.drill.common.logical.data.LogicalOperator; |
| import org.apache.drill.common.logical.data.Order; |
| import org.apache.drill.exec.planner.common.DrillWindowRelBase; |
| import org.apache.calcite.rel.core.AggregateCall; |
| import org.apache.calcite.rel.RelFieldCollation; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.plan.RelOptCluster; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rex.RexLiteral; |
| |
| import java.util.List; |
| |
| public class DrillWindowRel extends DrillWindowRelBase implements DrillRel { |
| /** |
| * Creates a window relational expression. |
| * |
| * @param cluster Cluster |
| * @param traits |
| * @param child Input relational expression |
| * @param rowType Output row type |
| * @param groups Windows |
| */ |
| public DrillWindowRel( |
| RelOptCluster cluster, |
| RelTraitSet traits, |
| RelNode child, |
| List<RexLiteral> constants, |
| RelDataType rowType, |
| List<Group> groups) { |
| super(cluster, traits, child, constants, rowType, groups); |
| } |
| |
| @Override |
| public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) { |
| return new DrillWindowRel(getCluster(), traitSet, sole(inputs), constants, getRowType(), groups); |
| } |
| |
| @Override |
| public LogicalOperator implement(DrillImplementor implementor) { |
| final LogicalOperator inputOp = implementor.visitChild(this, 0, getInput()); |
| org.apache.drill.common.logical.data.Window.Builder builder = new org.apache.drill.common.logical.data.Window.Builder(); |
| final List<String> fields = getRowType().getFieldNames(); |
| final List<String> childFields = getInput().getRowType().getFieldNames(); |
| for (Group window : groups) { |
| |
| for(RelFieldCollation orderKey : window.orderKeys.getFieldCollations()) { |
| builder.addOrdering(new Order.Ordering(orderKey.getDirection(), new FieldReference(fields.get(orderKey.getFieldIndex())))); |
| } |
| |
| for (int group : BitSets.toIter(window.keys)) { |
| FieldReference fr = new FieldReference(childFields.get(group), ExpressionPosition.UNKNOWN); |
| builder.addWithin(fr, fr); |
| } |
| |
| int groupCardinality = window.keys.cardinality(); |
| for (Ord<AggregateCall> aggCall : Ord.zip(window.getAggregateCalls(this))) { |
| FieldReference ref = new FieldReference(fields.get(groupCardinality + aggCall.i)); |
| LogicalExpression expr = toDrill(aggCall.e, childFields); |
| builder.addAggregation(ref, expr); |
| } |
| } |
| builder.setInput(inputOp); |
| org.apache.drill.common.logical.data.Window frame = builder.build(); |
| return frame; |
| } |
| |
| protected LogicalExpression toDrill(AggregateCall call, List<String> fn) { |
| List<LogicalExpression> args = Lists.newArrayList(); |
| for (Integer i : call.getArgList()) { |
| args.add(new FieldReference(fn.get(i))); |
| } |
| |
| // for count(1). |
| if (args.isEmpty()) { |
| args.add(new ValueExpressions.LongExpression(1l)); |
| } |
| LogicalExpression expr = new FunctionCall(call.getAggregation().getName().toLowerCase(), args, ExpressionPosition.UNKNOWN); |
| return expr; |
| } |
| } |
| |
| |