| /* |
| * 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.multi; |
| |
| import org.apache.iotdb.db.queryengine.transformation.dag.column.ColumnTransformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.udf.UDTFExecutor; |
| |
| import org.apache.tsfile.block.column.Column; |
| import org.apache.tsfile.block.column.ColumnBuilder; |
| import org.apache.tsfile.read.common.type.Type; |
| |
| public class MappableUDFColumnTransformer extends ColumnTransformer { |
| |
| private final ColumnTransformer[] inputColumnTransformers; |
| |
| private final UDTFExecutor executor; |
| |
| public MappableUDFColumnTransformer( |
| Type returnType, ColumnTransformer[] inputColumnTransformers, UDTFExecutor executor) { |
| super(returnType); |
| this.inputColumnTransformers = inputColumnTransformers; |
| this.executor = executor; |
| } |
| |
| @Override |
| public void evaluate() { |
| // pull columns from previous transformers |
| for (ColumnTransformer inputColumnTransformer : inputColumnTransformers) { |
| inputColumnTransformer.tryEvaluate(); |
| } |
| // construct input TsBlock with columns |
| int size = inputColumnTransformers.length; |
| Column[] columns = new Column[size]; |
| for (int i = 0; i < size; i++) { |
| columns[i] = inputColumnTransformers[i].getColumn(); |
| } |
| // construct TsBlockBuilder |
| int count = inputColumnTransformers[0].getColumnCachePositionCount(); |
| ColumnBuilder builder = returnType.createColumnBuilder(count); |
| // executor UDF and cache result |
| executor.execute(columns, builder); |
| initializeColumnCache(builder.build()); |
| } |
| |
| @Override |
| protected void checkType() { |
| // do nothing |
| } |
| |
| public ColumnTransformer[] getInputColumnTransformers() { |
| return inputColumnTransformers; |
| } |
| |
| @Override |
| public void close() { |
| // finalize executor |
| executor.beforeDestroy(); |
| } |
| } |