| /* |
| * 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.transformation.dag.column; |
| |
| import org.apache.iotdb.tsfile.read.common.block.column.Column; |
| import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder; |
| import org.apache.iotdb.tsfile.read.common.type.BinaryType; |
| import org.apache.iotdb.tsfile.read.common.type.BooleanType; |
| import org.apache.iotdb.tsfile.read.common.type.DoubleType; |
| import org.apache.iotdb.tsfile.read.common.type.FloatType; |
| import org.apache.iotdb.tsfile.read.common.type.IntType; |
| import org.apache.iotdb.tsfile.read.common.type.LongType; |
| import org.apache.iotdb.tsfile.read.common.type.Type; |
| import org.apache.iotdb.tsfile.utils.Pair; |
| |
| import org.apache.commons.lang3.Validate; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class CaseWhenThenColumnTransformer extends ColumnTransformer { |
| List<Pair<ColumnTransformer, ColumnTransformer>> whenThenTransformers; |
| ColumnTransformer elseTransformer; |
| |
| public CaseWhenThenColumnTransformer( |
| Type returnType, |
| List<ColumnTransformer> whenTransformers, |
| List<ColumnTransformer> thenTransformers, |
| ColumnTransformer elseTransformer) { |
| super(returnType); |
| Validate.isTrue( |
| whenTransformers.size() == thenTransformers.size(), |
| "the size between whenTransformers and thenTransformers needs to be same"); |
| this.whenThenTransformers = new ArrayList<>(); |
| for (int i = 0; i < whenTransformers.size(); i++) { |
| this.whenThenTransformers.add(new Pair<>(whenTransformers.get(i), thenTransformers.get(i))); |
| } |
| this.elseTransformer = elseTransformer; |
| } |
| |
| public List<Pair<ColumnTransformer, ColumnTransformer>> getWhenThenColumnTransformers() { |
| return whenThenTransformers; |
| } |
| |
| public ColumnTransformer getElseTransformer() { |
| return elseTransformer; |
| } |
| |
| private void writeToColumnBuilder( |
| ColumnTransformer childTransformer, Column column, int index, ColumnBuilder builder) { |
| if (returnType instanceof BooleanType) { |
| builder.writeBoolean(childTransformer.getType().getBoolean(column, index)); |
| } else if (returnType instanceof IntType) { |
| builder.writeInt(childTransformer.getType().getInt(column, index)); |
| } else if (returnType instanceof LongType) { |
| builder.writeLong(childTransformer.getType().getLong(column, index)); |
| } else if (returnType instanceof FloatType) { |
| builder.writeFloat(childTransformer.getType().getFloat(column, index)); |
| } else if (returnType instanceof DoubleType) { |
| builder.writeDouble(childTransformer.getType().getDouble(column, index)); |
| } else if (returnType instanceof BinaryType) { |
| builder.writeBinary(childTransformer.getType().getBinary(column, index)); |
| } else { |
| throw new UnsupportedOperationException("Unsupported Type"); |
| } |
| } |
| |
| @Override |
| protected void evaluate() { |
| List<Column> whenColumnList = new ArrayList<>(); |
| List<Column> thenColumnList = new ArrayList<>(); |
| for (Pair<ColumnTransformer, ColumnTransformer> whenThenTransformer : whenThenTransformers) { |
| whenThenTransformer.left.tryEvaluate(); |
| whenThenTransformer.right.tryEvaluate(); |
| } |
| elseTransformer.tryEvaluate(); |
| int positionCount = whenThenTransformers.get(0).left.getColumnCachePositionCount(); |
| for (Pair<ColumnTransformer, ColumnTransformer> whenThenTransformer : whenThenTransformers) { |
| whenColumnList.add(whenThenTransformer.left.getColumn()); |
| thenColumnList.add(whenThenTransformer.right.getColumn()); |
| } |
| ColumnBuilder builder = returnType.createColumnBuilder(positionCount); |
| Column elseColumn = elseTransformer.getColumn(); |
| for (int i = 0; i < positionCount; i++) { |
| boolean hasValue = false; |
| for (int j = 0; j < whenThenTransformers.size(); j++) { |
| Column whenColumn = whenColumnList.get(j); |
| Column thenColumn = thenColumnList.get(j); |
| if (!whenColumn.isNull(i) && whenColumn.getBoolean(i)) { |
| if (thenColumn.isNull(i)) { |
| builder.appendNull(); |
| } else { |
| writeToColumnBuilder(whenThenTransformers.get(j).right, thenColumn, i, builder); |
| } |
| hasValue = true; |
| break; |
| } |
| } |
| if (!hasValue) { |
| if (!elseColumn.isNull(i)) { |
| writeToColumnBuilder(elseTransformer, elseColumn, i, builder); |
| } else { |
| builder.appendNull(); |
| } |
| } |
| } |
| |
| initializeColumnCache(builder.build()); |
| } |
| |
| @Override |
| protected void checkType() { |
| // do nothing |
| } |
| } |