org.apache.hadoop.hive.ql.optimizer

Class GenMRRedSink1

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.GenMRRedSink1

All Implemented Interfaces:

NodeProcessor

public class GenMRRedSink1
extends Object
implements NodeProcessor

Processor for the rule - table scan followed by reduce sink.

Constructor Summary

Constructors

Constructor and Description
GenMRRedSink1()

Method Summary

Methods

Modifier and Type	Method and Description
Object	process(Node nd, Stack<Node> stack, NodeProcessorCtx opProcCtx, Object... nodeOutputs) Reduce Sink encountered.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GenMRRedSink1

public GenMRRedSink1()

Method Detail

process

public Object process(Node nd,
             Stack<Node> stack,
             NodeProcessorCtx opProcCtx,
             Object... nodeOutputs)
               throws SemanticException

Reduce Sink encountered. a) If we are seeing this RS for first time, we initialize plan corresponding to this RS. b) If we are seeing this RS for second or later time then either query had a join in which case we will merge this plan with earlier plan involving this RS or plan for this RS needs to be split in two branches.

Specified by:

process in interface NodeProcessor

Parameters:

nd - the reduce sink operator encountered

opProcCtx - context

nodeOutputs - A variable argument list of outputs from other nodes in the walk

Returns:

Object to be returned by the process call

Throws:

SemanticException