Class RemoveRedundantDistinctAggregation

java.lang.Object

io.trino.sql.planner.iterative.rule.RemoveRedundantDistinctAggregation

All Implemented Interfaces:

Rule<AggregationNode>

public class RemoveRedundantDistinctAggregation
extends Object
implements Rule<AggregationNode>

Removes DISTINCT only aggregation, when the input source is already distinct over a subset of the grouping keys as a result of another aggregation. Given:

 - Aggregate[keys = [a, max]]
   - Aggregate[keys = [a]]
     max := max(b)
 

Produces:

   - Aggregate[keys = [a]]
     max := max(b)
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
RemoveRedundantDistinctAggregation()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(AggregationNode aggregationNode, Captures captures, Rule.Context context)
Pattern<AggregationNode>	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

RemoveRedundantDistinctAggregation

public RemoveRedundantDistinctAggregation()

Method Details

getPattern

public Pattern<AggregationNode> getPattern()

Description copied from interface: Rule

Returns a pattern to which plan nodes this rule applies.

Specified by:

getPattern in interface Rule<AggregationNode>

apply

public Rule.Result apply(AggregationNode aggregationNode,
 Captures captures,
 Rule.Context context)

Specified by:

apply in interface Rule<AggregationNode>