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

Class TransformCorrelatedDistinctAggregationWithProjection

java.lang.Object

io.trino.sql.planner.iterative.rule.TransformCorrelatedDistinctAggregationWithProjection

All Implemented Interfaces:

Rule<CorrelatedJoinNode>

public class TransformCorrelatedDistinctAggregationWithProjection
extends Object
implements Rule<CorrelatedJoinNode>

This rule decorrelates a correlated subquery of LEFT correlated join with distinct operator (grouped aggregation with no aggregation assignments)

Transforms:

 - CorrelatedJoin LEFT (correlation: [c], filter: true, output: a, x)
      - Input (a, c)
      - Project (x <- b + 100)
           - Aggregation "distinct operator" group by [b]
                - Source (b) with correlated filter (b > c)
 

Into:

 - Project (a <- a, x <- b + 100)
      - Aggregation "distinct operator" group by [a, c, unique, b]
           - LEFT join (filter: b > c)
                - UniqueId (unique)
                     - Input (a, c)
                - Source (b) decorrelated
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
TransformCorrelatedDistinctAggregationWithProjection(Metadata metadata)

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(CorrelatedJoinNode correlatedJoinNode, Captures captures, Rule.Context context)
Pattern<CorrelatedJoinNode>	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 Detail

TransformCorrelatedDistinctAggregationWithProjection

public TransformCorrelatedDistinctAggregationWithProjection(Metadata metadata)

Method Detail

getPattern

public Pattern<CorrelatedJoinNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<CorrelatedJoinNode>

apply

public Rule.Result apply(CorrelatedJoinNode correlatedJoinNode,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<CorrelatedJoinNode>