| /** |
| * 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.pinot.core.plan; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| import javax.annotation.Nullable; |
| import org.apache.pinot.common.request.context.ExpressionContext; |
| import org.apache.pinot.core.operator.ProjectionOperator; |
| import org.apache.pinot.core.operator.filter.BaseFilterOperator; |
| import org.apache.pinot.core.operator.transform.PassThroughTransformOperator; |
| import org.apache.pinot.core.operator.transform.TransformOperator; |
| import org.apache.pinot.core.query.request.context.QueryContext; |
| import org.apache.pinot.segment.spi.IndexSegment; |
| |
| |
| /** |
| * The <code>TransformPlanNode</code> class provides the execution plan for transforms on a single segment. |
| */ |
| public class TransformPlanNode implements PlanNode { |
| private final IndexSegment _indexSegment; |
| private final QueryContext _queryContext; |
| private final Collection<ExpressionContext> _expressions; |
| private final int _maxDocsPerCall; |
| private final BaseFilterOperator _filterOperator; |
| |
| public TransformPlanNode(IndexSegment indexSegment, QueryContext queryContext, |
| Collection<ExpressionContext> expressions, int maxDocsPerCall) { |
| this(indexSegment, queryContext, expressions, maxDocsPerCall, null); |
| } |
| |
| public TransformPlanNode(IndexSegment indexSegment, QueryContext queryContext, |
| Collection<ExpressionContext> expressions, int maxDocsPerCall, @Nullable BaseFilterOperator filterOperator) { |
| _indexSegment = indexSegment; |
| _queryContext = queryContext; |
| _expressions = expressions; |
| _maxDocsPerCall = maxDocsPerCall; |
| _filterOperator = filterOperator; |
| } |
| |
| @Override |
| public TransformOperator run() { |
| Set<String> projectionColumns = new HashSet<>(); |
| boolean hasNonIdentifierExpression = false; |
| for (ExpressionContext expression : _expressions) { |
| expression.getColumns(projectionColumns); |
| if (expression.getType() != ExpressionContext.Type.IDENTIFIER) { |
| hasNonIdentifierExpression = true; |
| } |
| } |
| ProjectionOperator projectionOperator = |
| new ProjectionPlanNode(_indexSegment, _queryContext, projectionColumns, _maxDocsPerCall, _filterOperator).run(); |
| if (hasNonIdentifierExpression) { |
| return new TransformOperator(_queryContext, projectionOperator, _expressions); |
| } else { |
| return new PassThroughTransformOperator(projectionOperator, _expressions); |
| } |
| } |
| } |