/**
* 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.physical;
import java.io.Serializable;
import java.util.Stack;
import org.apache.hadoop.hive.ql.exec.JoinOperator;
import org.apache.hadoop.hive.ql.exec.Task;
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.optimizer.physical.SkewJoinResolver.SkewJoinProcCtx;
import org.apache.hadoop.hive.ql.parse.ParseContext;
import org.apache.hadoop.hive.ql.parse.SemanticException;
/**
* Node processor factory for skew join resolver.
*/
public final class SkewJoinProcFactory {
public static NodeProcessor getDefaultProc() {
return new SkewJoinDefaultProcessor();
}
public static NodeProcessor getJoinProc() {
return new SkewJoinJoinProcessor();
}
/**
* SkewJoinJoinProcessor.
*
*/
public static class SkewJoinJoinProcessor implements NodeProcessor {
public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx ctx,
Object... nodeOutputs) throws SemanticException {
SkewJoinProcCtx context = (SkewJoinProcCtx) ctx;
JoinOperator op = (JoinOperator) nd;
ParseContext parseContext = context.getParseCtx();
Task<? extends Serializable> currentTsk = context.getCurrentTask();
GenMRSkewJoinProcessor.processSkewJoin(op, currentTsk, parseContext);
return null;
}
}
/**
* SkewJoinDefaultProcessor.
*
*/
public static class SkewJoinDefaultProcessor implements NodeProcessor {
public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx ctx,
Object... nodeOutputs) throws SemanticException {
return null;
}
}
private SkewJoinProcFactory() {
// prevent instantiation
}
}