org.apache.hadoop.hive.ql.optimizer.physical

Class BucketingSortingOpProcFactory.GroupByInferrer

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.physical.BucketingSortingOpProcFactory.DefaultInferrer

org.apache.hadoop.hive.ql.optimizer.physical.BucketingSortingOpProcFactory.GroupByInferrer

All Implemented Interfaces:

NodeProcessor

Direct Known Subclasses:

BucketingSortingOpProcFactory.MultiGroupByInferrer

Enclosing class:

BucketingSortingOpProcFactory

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

Processor for GroupBy operator. This handles the standard use of a group by operator, the tree should look like ReduceSinkOperator --- GroupByOperator It is up to the caller to guarantee the tree matches this pattern.

Constructor Summary

Constructors

Constructor and Description
GroupByInferrer()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	process(Node nd, java.util.Stack<Node> stack, NodeProcessorCtx procCtx, java.lang.Object... nodeOutputs) Generic process for all ops that don't have specific implementations.
protected java.lang.Object	processGroupBy(Operator<? extends OperatorDesc> parent, GroupByOperator gop, BucketingSortingCtx bctx) Process a GroupByOperator to determine which if any columns the output is bucketed and sorted by, assumes the columns output by the parent which are bucketed and sorted have already been determined.
protected void	processGroupByReduceSink(ReduceSinkOperator rop, GroupByOperator gop, BucketingSortingCtx bctx) Process the ReduceSinkOperator preceding a GroupByOperator to determine which columns are bucketed and sorted.

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupByInferrer

public GroupByInferrer()

Method Detail

process

public java.lang.Object process(Node nd,
                                java.util.Stack<Node> stack,
                                NodeProcessorCtx procCtx,
                                java.lang.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.DefaultInferrer

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

processGroupByReduceSink

protected void processGroupByReduceSink(ReduceSinkOperator rop,
                                        GroupByOperator gop,
                                        BucketingSortingCtx bctx)

Process the ReduceSinkOperator preceding a GroupByOperator to determine which columns are bucketed and sorted.

Parameters:

rop -

gop -

bctx -

processGroupBy

protected java.lang.Object processGroupBy(Operator<? extends OperatorDesc> parent,
                                          GroupByOperator gop,
                                          BucketingSortingCtx bctx)

Process a GroupByOperator to determine which if any columns the output is bucketed and sorted by, assumes the columns output by the parent which are bucketed and sorted have already been determined.

Parameters:

parent -

gop -

bctx -

Returns: