Package io.trino.sql.planner.iterative.rule

Class PushLimitThroughUnion

java.lang.Object

io.trino.sql.planner.iterative.rule.PushLimitThroughUnion

All Implemented Interfaces:

Rule<LimitNode>

public class PushLimitThroughUnion
extends Object
implements Rule<LimitNode>

Transforms:

 - Limit
    - Union
       - relation1
       - relation2
       ..
 

Into:

 - Limit
    - Union
       - Limit
          - relation1
       - Limit
          - relation2
       ..
 

Applies to LimitNode without ties only to avoid optimizer loop.

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PushLimitThroughUnion()

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.trino.sql.planner.iterative.Rule

isEnabled

Constructor Details

PushLimitThroughUnion

public PushLimitThroughUnion()

Method Details

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>