io.prestosql.sql.planner.iterative.rule

Class MultipleDistinctAggregationToMarkDistinct

java.lang.Object

io.prestosql.sql.planner.iterative.rule.MultipleDistinctAggregationToMarkDistinct

All Implemented Interfaces:

Rule<AggregationNode>

public class MultipleDistinctAggregationToMarkDistinct
extends Object
implements Rule<AggregationNode>

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

 - Aggregation
        GROUP BY (k)
        F1(DISTINCT a0, a1, ...)
        F2(DISTINCT b0, b1, ...)
        F3(c0, c1, ...)
     - X
 

into

 - Aggregation
        GROUP BY (k)
        F1(a0, a1, ...) mask ($0)
        F2(b0, b1, ...) mask ($1)
        F3(c0, c1, ...)
     - MarkDistinct (k, a0, a1, ...) -> $0
          - MarkDistinct (k, b0, b1, ...) -> $1
              - X
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor and Description
MultipleDistinctAggregationToMarkDistinct()

Method Summary

Modifier and Type	Method and Description
Rule.Result	apply(AggregationNode parent, 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.prestosql.sql.planner.iterative.Rule

isEnabled

Constructor Detail

MultipleDistinctAggregationToMarkDistinct

public MultipleDistinctAggregationToMarkDistinct()

Method Detail

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 parent,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<AggregationNode>