org.apache.hadoop.hive.ql.optimizer

Class PointLookupOptimizer

java.lang.Object

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

org.apache.hadoop.hive.ql.optimizer.PointLookupOptimizer

public class PointLookupOptimizer
extends Transform

This optimization will take a Filter expression, and if its predicate contains an OR operator whose children are constant equality expressions, it will try to generate an IN clause (which is more efficient). If the OR operator contains AND operator children, the optimization might generate an IN clause that uses structs.

Field Summary

Fields

Modifier and Type	Field and Description
int	minOrExpr

Constructor Summary

Constructors

Constructor and Description
PointLookupOptimizer(int min)

Method Summary

Modifier and Type	Method and Description
ParseContext	transform(ParseContext pctx) All transformation steps implement this interface.

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

Field Detail

minOrExpr

public final int minOrExpr

Constructor Detail

PointLookupOptimizer

public PointLookupOptimizer(int min)

Method Detail

transform

public ParseContext transform(ParseContext pctx)
                       throws SemanticException

Description copied from class: Transform

All transformation steps implement this interface.

Specified by:

transform in class Transform

Parameters:

pctx - input parse context

Returns:

ParseContext

Throws:

SemanticException