| /** |
| * 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.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| import javax.annotation.Nullable; |
| import org.apache.pinot.core.operator.DocIdSetOperator; |
| import org.apache.pinot.core.operator.ProjectionOperator; |
| import org.apache.pinot.core.operator.filter.BaseFilterOperator; |
| import org.apache.pinot.core.query.request.context.QueryContext; |
| import org.apache.pinot.segment.spi.IndexSegment; |
| import org.apache.pinot.segment.spi.datasource.DataSource; |
| |
| |
| /** |
| * The <code>ProjectionPlanNode</code> class provides the execution plan for fetching projection columns' data source |
| * on a single segment. |
| */ |
| public class ProjectionPlanNode implements PlanNode { |
| private final IndexSegment _indexSegment; |
| private final QueryContext _queryContext; |
| private final Set<String> _projectionColumns; |
| private final int _maxDocsPerCall; |
| private final BaseFilterOperator _filterOperator; |
| |
| public ProjectionPlanNode(IndexSegment indexSegment, QueryContext queryContext, Set<String> projectionColumns, |
| int maxDocsPerCall, @Nullable BaseFilterOperator filterOperator) { |
| _indexSegment = indexSegment; |
| _queryContext = queryContext; |
| _projectionColumns = projectionColumns; |
| _maxDocsPerCall = maxDocsPerCall; |
| _filterOperator = filterOperator; |
| } |
| |
| @Override |
| public ProjectionOperator run() { |
| Map<String, DataSource> dataSourceMap = new HashMap<>(_projectionColumns.size()); |
| for (String column : _projectionColumns) { |
| dataSourceMap.put(column, _indexSegment.getDataSource(column)); |
| } |
| // NOTE: Skip creating DocIdSetOperator when maxDocsPerCall is 0 (for selection query with LIMIT 0) |
| DocIdSetOperator docIdSetOperator = |
| _maxDocsPerCall > 0 ? new DocIdSetPlanNode(_indexSegment, _queryContext, _maxDocsPerCall, _filterOperator).run() |
| : null; |
| return new ProjectionOperator(dataSourceMap, docIdSetOperator); |
| } |
| } |