org.apache.hadoop.hive.ql.optimizer
Class GroupByOptimizer

java.lang.Object
  extended by org.apache.hadoop.hive.ql.optimizer.GroupByOptimizer
All Implemented Interfaces:
Transform

public class GroupByOptimizer
extends Object
implements Transform

this transformation does bucket group by optimization.


Nested Class Summary
 class GroupByOptimizer.BucketGroupByProcessor
           
 class GroupByOptimizer.GroupByOptProcCtx
           
 
Constructor Summary
GroupByOptimizer()
           
 
Method Summary
 ParseContext transform(ParseContext pctx)
          All transformation steps implement this interface
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

GroupByOptimizer

public GroupByOptimizer()
Method Detail

transform

public ParseContext transform(ParseContext pctx)
                       throws SemanticException
Description copied from interface: Transform
All transformation steps implement this interface

Specified by:
transform in interface Transform
Parameters:
pctx - input parse context
Returns:
ParseContext
Throws:
SemanticException


Copyright © 2009 The Apache Software Foundation