org.apache.hadoop.hive.ql.optimizer
Class MapJoinFactory.MapJoin
java.lang.Object
org.apache.hadoop.hive.ql.optimizer.MapJoinFactory.MapJoin
- All Implemented Interfaces:
- NodeProcessor
- Enclosing class:
- MapJoinFactory
public static class MapJoinFactory.MapJoin
- extends Object
- implements NodeProcessor
MapJoin followed by Select.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
MapJoinFactory.MapJoin
public MapJoinFactory.MapJoin()
process
public Object process(Node nd,
Stack<Node> stack,
NodeProcessorCtx procCtx,
Object... nodeOutputs)
throws SemanticException
- Create a task by splitting the plan below the join. The reason, we have
to do so in the processing of Select and not MapJoin is due to the
walker. While processing a node, it is not safe to alter its children
because that will decide the course of the walk. It is perfectly fine to
muck around with its parents though, since those nodes have already been
visited.
- Specified by:
process
in interface NodeProcessor
- Parameters:
nd
- operator to processprocCtx
- operator processor contextnodeOutputs
- A variable argument list of outputs from other nodes in the walk
- Returns:
- Object to be returned by the process call
- Throws:
SemanticException
Copyright © 2011 The Apache Software Foundation