org.apache.hadoop.hive.ql.optimizer.physical
Class BucketingSortingOpProcFactory.MultiGroupByInferrer

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.physical.BucketingSortingOpProcFactory.DefaultInferrer
      org.apache.hadoop.hive.ql.optimizer.physical.BucketingSortingOpProcFactory.GroupByInferrer
          org.apache.hadoop.hive.ql.optimizer.physical.BucketingSortingOpProcFactory.MultiGroupByInferrer

All Implemented Interfaces:

NodeProcessor

Enclosing class:

BucketingSortingOpProcFactory

public static class BucketingSortingOpProcFactory.MultiGroupByInferrer
extends BucketingSortingOpProcFactory.GroupByInferrer
implements NodeProcessor

Processor for GroupByOperator, the special case where it follows a ForwardOperator There is a multi group by optimization which puts multiple group by operators in a reducer when they share the same keys and are part of a multi insert query. In this case the tree should look like Group By Operator / ReduceSinkOperator - ForwardOperator --- ... \ GroupByOperator

Constructor Summary

BucketingSortingOpProcFactory.MultiGroupByInferrer()

Method Summary

Object

process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs) Generic process for all ops that don't have specific implementations.

Methods inherited from class org.apache.hadoop.hive.ql.optimizer.physical.BucketingSortingOpProcFactory.GroupByInferrer

processGroupBy, processGroupByReduceSink

Methods inherited from class java.lang.Object

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

Constructor Detail

BucketingSortingOpProcFactory.MultiGroupByInferrer

public BucketingSortingOpProcFactory.MultiGroupByInferrer()

Method Detail

process

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

Description copied from interface: NodeProcessor

Generic process for all ops that don't have specific implementations.

Specified by:

process in interface NodeProcessor

Overrides:

process in class BucketingSortingOpProcFactory.GroupByInferrer

Parameters:

nd - operator to process

procCtx - operator processor 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