| /** |
| * 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 com.google.common.base.Preconditions; |
| import java.util.List; |
| import org.apache.pinot.common.request.context.ExpressionContext; |
| import org.apache.pinot.core.operator.streaming.StreamingSelectionOnlyOperator; |
| import org.apache.pinot.core.operator.transform.TransformOperator; |
| import org.apache.pinot.core.query.request.context.QueryContext; |
| import org.apache.pinot.core.query.selection.SelectionOperatorUtils; |
| import org.apache.pinot.segment.spi.IndexSegment; |
| |
| |
| /** |
| * The {@code StreamingSelectionPlanNode} class provides the execution plan for streaming selection query on a single |
| * segment. |
| * <p>NOTE: ORDER-BY is ignored for streaming selection query. |
| */ |
| public class StreamingSelectionPlanNode implements PlanNode { |
| private final IndexSegment _indexSegment; |
| private final QueryContext _queryContext; |
| |
| public StreamingSelectionPlanNode(IndexSegment indexSegment, QueryContext queryContext) { |
| Preconditions.checkState(queryContext.getOrderByExpressions() == null, |
| "Selection order-by is not supported for streaming"); |
| _indexSegment = indexSegment; |
| _queryContext = queryContext; |
| } |
| |
| @Override |
| public StreamingSelectionOnlyOperator run() { |
| List<ExpressionContext> expressions = SelectionOperatorUtils.extractExpressions(_queryContext, _indexSegment); |
| TransformOperator transformOperator = new TransformPlanNode(_indexSegment, _queryContext, expressions, |
| Math.min(_queryContext.getLimit(), DocIdSetPlanNode.MAX_DOC_PER_CALL)).run(); |
| return new StreamingSelectionOnlyOperator(_indexSegment, _queryContext, expressions, transformOperator); |
| } |
| } |