| // 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.impala.planner; |
| |
| import org.apache.impala.analysis.Analyzer; |
| import org.apache.impala.common.ImpalaException; |
| import org.apache.impala.thrift.TExplainLevel; |
| import org.apache.impala.thrift.TPlanNode; |
| import org.apache.impala.thrift.TPlanNodeType; |
| import org.apache.impala.thrift.TQueryOptions; |
| |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * A SingularRowSrcNode returns the current row that is being processed by its |
| * containing SubplanNode. A SingularRowSrcNode can only appear in the plan tree |
| * of a SubplanNode. A SingularRowSrcNode returns its parent's smap such that |
| * substitutions are appropriately applied within the SubplanNode's second child. |
| */ |
| public class SingularRowSrcNode extends PlanNode { |
| private final SubplanNode containingSubplanNode_; |
| |
| protected SingularRowSrcNode(PlanNodeId id, SubplanNode containingSubplanNode) { |
| super(id, "SINGULAR ROW SRC"); |
| containingSubplanNode_ = containingSubplanNode; |
| computeTupleIds(); |
| } |
| |
| @Override |
| public void computeTupleIds() { |
| clearTupleIds(); |
| tupleIds_.addAll(containingSubplanNode_.getChild(0).getTupleIds()); |
| tblRefIds_.addAll(containingSubplanNode_.getChild(0).getTblRefIds()); |
| nullableTupleIds_.addAll(containingSubplanNode_.getChild(0).getNullableTupleIds()); |
| } |
| |
| @Override |
| public void init(Analyzer analyzer) throws ImpalaException { |
| super.init(analyzer); |
| outputSmap_ = containingSubplanNode_.getChild(0).getOutputSmap(); |
| Preconditions.checkState(conjuncts_.isEmpty()); |
| } |
| |
| @Override |
| public void computeStats(Analyzer analyzer) { |
| super.computeStats(analyzer); |
| cardinality_ = 1; |
| // The containing SubplanNode has not yet been initialized, so get the number |
| // of nodes from the SubplanNode's input. |
| numNodes_ = containingSubplanNode_.getChild(0).getNumNodes(); |
| } |
| |
| @Override |
| public void computeNodeResourceProfile(TQueryOptions queryOptions) { |
| // TODO: add an estimate |
| nodeResourceProfile_ = ResourceProfile.noReservation(0); |
| } |
| |
| @Override |
| protected String getNodeExplainString(String prefix, String detailPrefix, |
| TExplainLevel detailLevel) { |
| StringBuilder output = new StringBuilder(); |
| output.append(String.format("%s%s\n", prefix, getDisplayLabel())); |
| if (detailLevel.ordinal() >= TExplainLevel.EXTENDED.ordinal()) { |
| output.append(String.format( |
| "%sparent-subplan=%s\n", detailPrefix, containingSubplanNode_.getId())); |
| } |
| return output.toString(); |
| } |
| |
| @Override |
| protected void toThrift(TPlanNode msg) { |
| msg.node_type = TPlanNodeType.SINGULAR_ROW_SRC_NODE; |
| } |
| } |