org.apache.hadoop.hive.ql.optimizer

Class Transform

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.Transform

Direct Known Subclasses:

AnnotateWithOpTraits, AnnotateWithStatistics, BucketingSortingReduceSinkOptimizer, BucketMapJoinOptimizer, ColumnPruner, ConstantPropagate, CorrelationOptimizer, CountDistinctRewriteProc, FixedBucketPruningOptimizer, Generator, GlobalLimitOptimizer, GroupByOptimizer, HiveOpConverterPostProc, IdentityProjectRemover, JoinReorder, LimitPushdownOptimizer, ListBucketingPruner, MapJoinProcessor, NonBlockingOpDeDupProc, PartitionColumnsSeparator, PartitionConditionRemover, PartitionPruner, PointLookupOptimizer, PredicatePushDown, PredicateTransitivePropagate, ReduceSinkDeDuplication, ReduceSinkJoinDeDuplication, RedundantDynamicPruningConditionsRemoval, SamplePruner, SharedWorkOptimizer, SimpleFetchAggregation, SimpleFetchOptimizer, SimplePredicatePushDown, SkewJoinOptimizer, SortedDynPartitionOptimizer, SortedDynPartitionTimeGranularityOptimizer, SortedMergeBucketMapJoinOptimizer, StatsOptimizer, SyntheticJoinPredicate, UnionProcessor

public abstract class Transform
extends Object

Optimizer interface. All the rule-based optimizations implement this interface. All the transformations are invoked sequentially. They take the current parse context (which contains the operator tree among other things), perform all the optimizations, and then return the updated parse context.

Constructor Summary

Constructors

Constructor and Description
Transform()

Method Summary

Modifier and Type	Method and Description
void	beginPerfLogging()
void	endPerfLogging()
void	endPerfLogging(String additionalInfo)
abstract 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

Transform

public Transform()

Method Detail

transform

public abstract ParseContext transform(ParseContext pctx)
                                throws SemanticException

All transformation steps implement this interface.

Parameters:

pctx - input parse context

Returns:

ParseContext

Throws:

SemanticException

beginPerfLogging

public void beginPerfLogging()

endPerfLogging

public void endPerfLogging()

endPerfLogging

public void endPerfLogging(String additionalInfo)