org.apache.hadoop.hive.ql.optimizer.SortedMergeJoinProc Maven / Gradle / Ivy
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/**
* 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.hadoop.hive.ql.optimizer;
import java.util.Stack;
import org.apache.hadoop.hive.ql.exec.JoinOperator;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.lib.NodeProcessor;
import org.apache.hadoop.hive.ql.lib.NodeProcessorCtx;
import org.apache.hadoop.hive.ql.parse.ParseContext;
import org.apache.hadoop.hive.ql.parse.SemanticException;
public class SortedMergeJoinProc extends AbstractSMBJoinProc implements NodeProcessor {
public SortedMergeJoinProc(ParseContext pctx) {
super(pctx);
}
public SortedMergeJoinProc() {
}
@Override
public Object process(Node nd, Stack stack, NodeProcessorCtx procCtx,
Object... nodeOutputs) throws SemanticException {
JoinOperator joinOp = (JoinOperator) nd;
SortBucketJoinProcCtx smbJoinContext = (SortBucketJoinProcCtx) procCtx;
boolean convert =
canConvertJoinToSMBJoin(
joinOp, smbJoinContext);
if (convert) {
convertJoinToSMBJoin(joinOp, smbJoinContext);
}
return null;
}
}