io.prestosql.sql.planner.iterative.rule

Class AddIntermediateAggregations

java.lang.Object

io.prestosql.sql.planner.iterative.rule.AddIntermediateAggregations

All Implemented Interfaces:

Rule<AggregationNode>

public class AddIntermediateAggregations
extends Object
implements Rule<AggregationNode>

Adds INTERMEDIATE aggregations between an un-grouped FINAL aggregation and its preceding PARTIAL aggregation.

From:

 - Aggregation (FINAL)
   - RemoteExchange (GATHER)
     - Aggregation (PARTIAL)
 

To:

 - Aggregation (FINAL)
   - LocalExchange (GATHER)
     - Aggregation (INTERMEDIATE)
       - LocalExchange (ARBITRARY)
         - RemoteExchange (GATHER)
           - Aggregation (INTERMEDIATE)
             - LocalExchange (GATHER)
               - Aggregation (PARTIAL)
 

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
AddIntermediateAggregations()

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.
boolean	isEnabled(Session session)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AddIntermediateAggregations

public AddIntermediateAggregations()

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>

isEnabled

public boolean isEnabled(Session session)

Specified by:

isEnabled in interface Rule<AggregationNode>

apply

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

Specified by:

apply in interface Rule<AggregationNode>