org.apache.hadoop.hive.ql.optimizer

Class RedundantDynamicPruningConditionsRemoval

java.lang.Object

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

org.apache.hadoop.hive.ql.optimizer.RedundantDynamicPruningConditionsRemoval

public class RedundantDynamicPruningConditionsRemoval
extends Transform

Takes a Filter operator on top of a TableScan and removes dynamic pruning conditions if static partition pruning has been triggered already. This transformation is executed when CBO is on and hence we can guarantee that the filtering conditions on the partition columns will be immediately on top of the TableScan operator.

Constructor Summary

Constructors

Constructor and Description
RedundantDynamicPruningConditionsRemoval()

Method Summary

Modifier and Type	Method and Description
ParseContext	transform(ParseContext pctx) Transform the query tree.

Methods inherited from class org.apache.hadoop.hive.ql.optimizer.Transform

beginPerfLogging, endPerfLogging, endPerfLogging

Methods inherited from class java.lang.Object

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

Constructor Detail

RedundantDynamicPruningConditionsRemoval

public RedundantDynamicPruningConditionsRemoval()

Method Detail

transform

public ParseContext transform(ParseContext pctx)
                       throws SemanticException

Transform the query tree.

Specified by:

transform in class Transform

Parameters:

pctx - the current parse context

Returns:

ParseContext

Throws:

SemanticException