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

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.AbstractBucketJoinProc

All Implemented Interfaces:

NodeProcessor

Direct Known Subclasses:

AbstractSMBJoinProc, BucketMapjoinProc

public abstract class AbstractBucketJoinProc
extends Object
implements NodeProcessor

this transformation does bucket map join optimization.

Field Summary

protected ParseContext

pGraphContext

Constructor Summary

AbstractBucketJoinProc()

AbstractBucketJoinProc(ParseContext pGraphContext)

Method Summary

protected boolean	canConvertMapJoinToBucketMapJoin(MapJoinOperator mapJoinOp, ParseContext pGraphContext, BucketJoinProcCtx context)
protected boolean	checkConvertBucketMapJoin(ParseContext pGraphContext, BucketJoinProcCtx context, QBJoinTree joinCtx, Map<Byte,List<ExprNodeDesc>> keysMap, String baseBigAlias, List<String> joinAliases)
protected void	convertMapJoinToBucketMapJoin(MapJoinOperator mapJoinOp, BucketJoinProcCtx context)
abstract Object	process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs) Generic process for all ops that don't have specific implementations.
List<String>	toColumns(List<ExprNodeDesc> keys)

Methods inherited from class java.lang.Object

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

Field Detail

pGraphContext

protected ParseContext pGraphContext

Constructor Detail

AbstractBucketJoinProc

public AbstractBucketJoinProc(ParseContext pGraphContext)

AbstractBucketJoinProc

public AbstractBucketJoinProc()

Method Detail

process

public abstract 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

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

canConvertMapJoinToBucketMapJoin

protected boolean canConvertMapJoinToBucketMapJoin(MapJoinOperator mapJoinOp,
                                                   ParseContext pGraphContext,
                                                   BucketJoinProcCtx context)
                                            throws SemanticException

Throws:

SemanticException

checkConvertBucketMapJoin

protected boolean checkConvertBucketMapJoin(ParseContext pGraphContext,
                                            BucketJoinProcCtx context,
                                            QBJoinTree joinCtx,
                                            Map<Byte,List<ExprNodeDesc>> keysMap,
                                            String baseBigAlias,
                                            List<String> joinAliases)
                                     throws SemanticException

Throws:

SemanticException

convertMapJoinToBucketMapJoin

protected void convertMapJoinToBucketMapJoin(MapJoinOperator mapJoinOp,
                                             BucketJoinProcCtx context)
                                      throws SemanticException

Throws:

SemanticException

toColumns

public List<String> toColumns(List<ExprNodeDesc> keys)