| /* |
| * 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.other; |
| |
| import org.apache.iotdb.db.queryengine.common.NodeRef; |
| import org.apache.iotdb.db.queryengine.plan.expression.Expression; |
| import org.apache.iotdb.db.queryengine.plan.expression.ExpressionType; |
| import org.apache.iotdb.db.queryengine.plan.expression.binary.WhenThenExpression; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.NullOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.visitor.ExpressionVisitor; |
| import org.apache.iotdb.db.queryengine.plan.planner.plan.parameter.InputLocation; |
| import org.apache.iotdb.db.queryengine.transformation.dag.memory.LayerMemoryAssigner; |
| import org.apache.iotdb.db.queryengine.transformation.dag.udf.UDTFExecutor; |
| |
| import org.apache.commons.lang3.Validate; |
| import org.apache.tsfile.enums.TSDataType; |
| import org.apache.tsfile.utils.ReadWriteIOUtils; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.time.ZoneId; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class CaseWhenThenExpression extends Expression { |
| protected List<WhenThenExpression> whenThenExpressions = new ArrayList<>(); |
| protected Expression elseExpression; |
| |
| public CaseWhenThenExpression( |
| List<WhenThenExpression> whenThenExpressions, Expression elseExpression) { |
| this.whenThenExpressions = whenThenExpressions; |
| this.elseExpression = elseExpression; |
| if (this.elseExpression == null) { |
| this.elseExpression = new NullOperand(); |
| } |
| } |
| |
| public CaseWhenThenExpression(ByteBuffer byteBuffer) { |
| int len = ReadWriteIOUtils.readInt(byteBuffer); |
| Validate.isTrue( |
| len > 0, "the length of CaseWhenThenExpression's whenThenList must greater than 0"); |
| for (int i = 0; i < len; i++) { |
| Expression expression = Expression.deserialize(byteBuffer); |
| this.whenThenExpressions.add((WhenThenExpression) expression); |
| } |
| this.elseExpression = Expression.deserialize(byteBuffer); |
| } |
| |
| public void setElseExpression(Expression expression) { |
| this.elseExpression = expression; |
| } |
| |
| public List<WhenThenExpression> getWhenThenExpressions() { |
| return whenThenExpressions; |
| } |
| |
| public Expression getElseExpression() { |
| return elseExpression; |
| } |
| |
| @Override |
| public ExpressionType getExpressionType() { |
| return ExpressionType.CASE_WHEN_THEN; |
| } |
| |
| @Override |
| public boolean isMappable(Map<NodeRef<Expression>, TSDataType> expressionTypes) { |
| for (Expression expression : this.getExpressions()) { |
| if (!expression.isMappable(expressionTypes)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| protected boolean isConstantOperandInternal() { |
| for (Expression expression : this.getExpressions()) { |
| if (!expression.isConstantOperand()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public void constructUdfExecutors( |
| Map<String, UDTFExecutor> expressionName2Executor, ZoneId zoneId) { |
| for (Expression expression : this.getExpressions()) { |
| expression.constructUdfExecutors(expressionName2Executor, zoneId); |
| } |
| } |
| |
| @Override |
| public void bindInputLayerColumnIndexWithExpression( |
| Map<String, List<InputLocation>> inputLocations) { |
| this.getExpressions() |
| .forEach(expression -> expression.bindInputLayerColumnIndexWithExpression(inputLocations)); |
| final String digest = getExpressionString(); |
| |
| if (inputLocations.containsKey(digest)) { |
| inputColumnIndex = inputLocations.get(digest).get(0).getValueColumnIndex(); |
| } |
| } |
| |
| @Override |
| public void updateStatisticsForMemoryAssigner(LayerMemoryAssigner memoryAssigner) { |
| this.getExpressions() |
| .forEach(expression -> expression.updateStatisticsForMemoryAssigner(memoryAssigner)); |
| memoryAssigner.increaseExpressionReference(this); |
| } |
| |
| @Override |
| protected String getExpressionStringInternal() { |
| StringBuilder builder = new StringBuilder(); |
| builder.append("CASE "); |
| for (Expression expression : this.whenThenExpressions) { |
| builder.append(expression.getExpressionString()).append(" "); |
| } |
| if (!(this.elseExpression instanceof NullOperand)) { |
| builder.append("ELSE ").append(this.elseExpression.getExpressionString()).append(" "); |
| } |
| builder.append("END"); |
| return builder.toString(); |
| } |
| |
| @Override |
| protected void serialize(ByteBuffer byteBuffer) { |
| int len = this.whenThenExpressions.size(); |
| ReadWriteIOUtils.write(len, byteBuffer); |
| getExpressions().forEach(child -> Expression.serialize(child, byteBuffer)); |
| } |
| |
| @Override |
| protected void serialize(DataOutputStream stream) throws IOException { |
| ReadWriteIOUtils.write(this.whenThenExpressions.size(), stream); |
| for (Expression expression : this.getExpressions()) { |
| Expression.serialize(expression, stream); |
| } |
| } |
| |
| @Override |
| public List<Expression> getExpressions() { |
| List<Expression> result = new ArrayList<>(whenThenExpressions); |
| result.add(elseExpression); |
| return result; |
| } |
| |
| @Override |
| public String getOutputSymbolInternal() { |
| StringBuilder builder = new StringBuilder(); |
| builder.append("CASE "); |
| for (Expression expression : this.whenThenExpressions) { |
| builder.append(expression.getOutputSymbol()).append(" "); |
| } |
| if (!(this.elseExpression instanceof NullOperand)) { |
| builder.append("ELSE ").append(this.elseExpression.getOutputSymbol()).append(" "); |
| } |
| builder.append("END"); |
| return builder.toString(); |
| } |
| |
| @Override |
| public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) { |
| return visitor.visitCaseWhenThenExpression(this, context); |
| } |
| } |