| /* |
| * 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.iotdb.db.queryengine.plan.expression.visitor.cartesian; |
| |
| import org.apache.iotdb.commons.path.MeasurementPath; |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.commons.schema.view.LogicalViewSchema; |
| import org.apache.iotdb.commons.schema.view.viewExpression.ViewExpression; |
| import org.apache.iotdb.db.queryengine.common.schematree.ISchemaTree; |
| import org.apache.iotdb.db.queryengine.plan.analyze.ExpressionUtils; |
| import org.apache.iotdb.db.queryengine.plan.expression.Expression; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.ConstantOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimeSeriesOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimestampOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.multi.FunctionExpression; |
| import org.apache.iotdb.db.queryengine.plan.expression.visitor.CompleteMeasurementSchemaVisitor; |
| import org.apache.iotdb.db.schemaengine.schemaregion.view.visitor.TransformToExpressionVisitor; |
| import org.apache.iotdb.db.utils.constant.SqlConstant; |
| |
| import org.apache.tsfile.write.schema.IMeasurementSchema; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| import static org.apache.iotdb.db.queryengine.plan.analyze.ExpressionUtils.cartesianProduct; |
| import static org.apache.iotdb.db.queryengine.plan.analyze.ExpressionUtils.reconstructFunctionExpressions; |
| import static org.apache.iotdb.db.utils.TypeInferenceUtils.bindTypeForBuiltinAggregationNonSeriesInputExpressions; |
| import static org.apache.iotdb.db.utils.constant.SqlConstant.COUNT_TIME; |
| |
| public class BindSchemaForExpressionVisitor extends CartesianProductVisitor<ISchemaTree> { |
| |
| @Override |
| public List<Expression> visitFunctionExpression( |
| FunctionExpression functionExpression, ISchemaTree schemaTree) { |
| |
| if (COUNT_TIME.equalsIgnoreCase(functionExpression.getFunctionName())) { |
| List<Expression> usedExpressions = |
| functionExpression.getExpressions().stream() |
| .flatMap(e -> process(e, schemaTree).stream()) |
| .collect(Collectors.toList()); |
| |
| Expression countTimeExpression = |
| new FunctionExpression( |
| COUNT_TIME, |
| new LinkedHashMap<>(), |
| Collections.singletonList(new TimestampOperand()), |
| usedExpressions); |
| return Collections.singletonList(countTimeExpression); |
| } |
| |
| // One by one, remove the wildcards from the input expressions. In most cases, an expression |
| // will produce multiple expressions after removing the wildcards. We use extendedExpressions |
| // to collect the produced expressions. |
| List<List<Expression>> extendedExpressions = new ArrayList<>(); |
| for (Expression originExpression : functionExpression.getExpressions()) { |
| List<Expression> actualExpressions = process(originExpression, schemaTree); |
| if (actualExpressions.isEmpty()) { |
| // Let's ignore the eval of the function which has at least one non-existence series as |
| // input. See IOTDB-1212: https://github.com/apache/iotdb/pull/3101 |
| return Collections.emptyList(); |
| } |
| extendedExpressions.add(actualExpressions); |
| |
| // We just process first input Expression of Count_IF, |
| // keep other input Expressions as origin and bind Type |
| if (SqlConstant.COUNT_IF.equalsIgnoreCase(functionExpression.getFunctionName())) { |
| List<Expression> children = functionExpression.getExpressions(); |
| bindTypeForBuiltinAggregationNonSeriesInputExpressions( |
| functionExpression.getFunctionName(), children, extendedExpressions); |
| break; |
| } |
| } |
| |
| // Calculate the Cartesian product of extendedExpressions to get the actual expressions after |
| // removing all wildcards. We use actualExpressions to collect them. |
| List<List<Expression>> childExpressionsList = new ArrayList<>(); |
| cartesianProduct(extendedExpressions, childExpressionsList, 0, new ArrayList<>()); |
| |
| return reconstructFunctionExpressions(functionExpression, childExpressionsList); |
| } |
| |
| @Override |
| public List<Expression> visitTimeSeriesOperand( |
| TimeSeriesOperand timeSeriesOperand, ISchemaTree schemaTree) { |
| PartialPath timeSeriesOperandPath = timeSeriesOperand.getPath(); |
| List<MeasurementPath> actualPaths = |
| schemaTree.searchMeasurementPaths(timeSeriesOperandPath).left; |
| // process logical view |
| List<MeasurementPath> nonViewActualPaths = new ArrayList<>(); |
| List<MeasurementPath> viewPaths = new ArrayList<>(); |
| for (MeasurementPath measurementPath : actualPaths) { |
| if (measurementPath.getMeasurementSchema().isLogicalView()) { |
| viewPaths.add(measurementPath); |
| } else { |
| nonViewActualPaths.add(measurementPath); |
| } |
| } |
| List<Expression> reconstructTimeSeriesOperands = |
| ExpressionUtils.reconstructTimeSeriesOperands(timeSeriesOperand, nonViewActualPaths); |
| // handle logical views |
| for (MeasurementPath measurementPath : viewPaths) { |
| Expression replacedExpression = transformViewPath(measurementPath, schemaTree); |
| replacedExpression.setViewPath(measurementPath); |
| reconstructTimeSeriesOperands.add(replacedExpression); |
| } |
| return reconstructTimeSeriesOperands; |
| } |
| |
| @Override |
| public List<Expression> visitTimeStampOperand( |
| TimestampOperand timestampOperand, ISchemaTree schemaTree) { |
| return Collections.singletonList(timestampOperand); |
| } |
| |
| @Override |
| public List<Expression> visitConstantOperand( |
| ConstantOperand constantOperand, ISchemaTree schemaTree) { |
| return Collections.singletonList(constantOperand); |
| } |
| |
| public static Expression transformViewPath( |
| MeasurementPath measurementPath, ISchemaTree schemaTree) { |
| IMeasurementSchema measurementSchema = measurementPath.getMeasurementSchema(); |
| if (!measurementSchema.isLogicalView()) { |
| throw new IllegalArgumentException( |
| "Can not construct expression using non view path in transformViewPath!"); |
| } |
| |
| ViewExpression viewExpression = ((LogicalViewSchema) measurementSchema).getExpression(); |
| // complete measurementPaths in expressions. |
| Expression expression = new TransformToExpressionVisitor().process(viewExpression, null); |
| expression = new CompleteMeasurementSchemaVisitor().process(expression, schemaTree); |
| return expression; |
| } |
| } |