org.apache.hadoop.hive.ql.parse.UnionProcessor Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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* See the License for the specific language governing permissions and
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*/
package org.apache.hadoop.hive.ql.parse;
import java.util.Stack;
import com.facebook.presto.hive.$internal.org.slf4j.Logger;
import com.facebook.presto.hive.$internal.org.slf4j.LoggerFactory;
import org.apache.hadoop.hive.ql.exec.UnionOperator;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.lib.NodeProcessor;
import org.apache.hadoop.hive.ql.lib.NodeProcessorCtx;
/**
* FileSinkProcessor is a simple rule to remember seen unions for later
* processing.
*
*/
public class UnionProcessor implements NodeProcessor {
static final private Logger LOG = LoggerFactory.getLogger(UnionProcessor.class.getName());
@Override
public Object process(Node nd, Stack stack, NodeProcessorCtx procCtx, Object... nodeOutputs)
throws SemanticException {
GenTezProcContext context = (GenTezProcContext) procCtx;
UnionOperator union = (UnionOperator) nd;
// simply need to remember that we've seen a union.
context.currentUnionOperators.add(union);
return null;
}
}