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

Class SingleDistinctAggregationToGroupBy

java.lang.Object

io.trino.sql.planner.iterative.rule.SingleDistinctAggregationToGroupBy

All Implemented Interfaces:

Rule<AggregationNode>

public class SingleDistinctAggregationToGroupBy
extends Object
implements Rule<AggregationNode>

Implements distinct aggregations with similar inputs by transforming plans of the following shape:

 - Aggregation
        GROUP BY (k)
        F1(DISTINCT s0, s1, ...),
        F2(DISTINCT s0, s1, ...),
     - X
 

into

 - Aggregation
          GROUP BY (k)
          F1(s0, s1, ...)
          F2(s0, s1, ...)
      - Aggregation
             GROUP BY (k, s0, s1, ...)
          - X
 

Assumes s0, s1, ... are symbol references (i.e., complex expressions have been pre-projected)

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
SingleDistinctAggregationToGroupBy()

Method Summary

Modifier and Type	Method	Description
Rule.Result	apply(AggregationNode aggregation, 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

SingleDistinctAggregationToGroupBy

public SingleDistinctAggregationToGroupBy()

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 aggregation,
 Captures captures,
 Rule.Context context)

Specified by:

apply in interface Rule<AggregationNode>