io.prestosql.sql.planner.iterative.rule

Class ImplementFilteredAggregations

java.lang.Object

io.prestosql.sql.planner.iterative.rule.ImplementFilteredAggregations

All Implemented Interfaces:

Rule<AggregationNode>

public class ImplementFilteredAggregations
extends Object
implements Rule<AggregationNode>

Implements filtered aggregations by transforming plans of the following shape:

 - Aggregation
        F1(...) FILTER (WHERE C1(...)),
        F2(...) FILTER (WHERE C2(...))
     - X
 

into

 - Aggregation
        F1(...) mask ($0)
        F2(...) mask ($1)
     - Filter(mask ($0) OR mask ($1))
     - Project
            <identity projections for existing fields>
            $0 = C1(...)
            $1 = C2(...)
         - 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
ImplementFilteredAggregations()

Method Summary

Modifier and Type	Method and 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.prestosql.sql.planner.iterative.Rule

isEnabled

Constructor Detail

ImplementFilteredAggregations

public ImplementFilteredAggregations()

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 aggregation,
                         Captures captures,
                         Rule.Context context)

Specified by:

apply in interface Rule<AggregationNode>