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

Class TransformFilteringSemiJoinToInnerJoin

java.lang.Object

io.trino.sql.planner.iterative.rule.TransformFilteringSemiJoinToInnerJoin

All Implemented Interfaces:

Rule<FilterNode>

public class TransformFilteringSemiJoinToInnerJoin
extends Object
implements Rule<FilterNode>

Rewrite filtering semi-join to inner join.

Transforms:

 - Filter (semiJoinSymbol AND predicate)
    - SemiJoin (semiJoinSymbol <- (a IN b))
        source: plan A producing symbol a
        filtering source: plan B producing symbol b
 

Into:

 - Project (semiJoinSymbol <- TRUE)
    - Join INNER on (a = b), joinFilter (predicate with semiJoinSymbol replaced with TRUE)
       - source
       - Aggregation distinct(b)
          - filtering source
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
TransformFilteringSemiJoinToInnerJoin()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(FilterNode filterNode, Captures captures, Rule.Context context)
Pattern<FilterNode>	getPattern()	Returns a pattern to which plan nodes this rule applies.
boolean	isEnabled(Session session)

Methods inherited from class java.lang.Object

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

Constructor Detail

TransformFilteringSemiJoinToInnerJoin

public TransformFilteringSemiJoinToInnerJoin()

Method Detail

getPattern

public Pattern<FilterNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<FilterNode>

isEnabled

public boolean isEnabled(Session session)

Specified by:

isEnabled in interface Rule<FilterNode>

apply

public Rule.Result apply(FilterNode filterNode,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<FilterNode>