Package io.prestosql.sql.planner.iterative.rule

Class PushLimitThroughOuterJoin

java.lang.Object

io.prestosql.sql.planner.iterative.rule.PushLimitThroughOuterJoin

All Implemented Interfaces:

Rule<LimitNode>

public class PushLimitThroughOuterJoin
extends Object
implements Rule<LimitNode>

Transforms:

 - Limit
    - Join
       - left source
       - right source
 

Into:

 - Limit
    - Join
       - Limit (present if Join is left or outer)
          - left source
       - Limit (present if Join is right or outer)
          - right source
 

Applies to LimitNode without ties only to avoid optimizer loop.

Nested Class Summary

Nested classes/interfaces inherited from interface io.prestosql.sql.planner.iterative.Rule

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PushLimitThroughOuterJoin()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(LimitNode parent, Captures captures, Rule.Context context)
Pattern<LimitNode>	getPattern()	Returns a pattern to which plan nodes this rule applies.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.prestosql.sql.planner.iterative.Rule

isEnabled

Constructor Detail

PushLimitThroughOuterJoin

public PushLimitThroughOuterJoin()

Method Detail

getPattern

public Pattern<LimitNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<LimitNode>

apply

public Rule.Result apply(LimitNode parent,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<LimitNode>