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

Class MergeLimitOverProjectWithSort

java.lang.Object

io.trino.sql.planner.iterative.rule.MergeLimitOverProjectWithSort

All Implemented Interfaces:

Rule<LimitNode>

public class MergeLimitOverProjectWithSort
extends Object
implements Rule<LimitNode>

Transforms:

 - Limit (limit = x)
    - Project (identity, narrowing)
       - Sort (order by a, b)
 

Into:

 - Project (identity, narrowing)
    - TopN (limit = x, order by a, b)
 

Applies to LimitNode without ties only.

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
MergeLimitOverProjectWithSort()

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

MergeLimitOverProjectWithSort

public MergeLimitOverProjectWithSort()

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>