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

Class PreAggregateCaseAggregations

java.lang.Object

io.trino.sql.planner.iterative.rule.PreAggregateCaseAggregations

All Implemented Interfaces:

Rule<AggregationNode>

public class PreAggregateCaseAggregations
extends Object
implements Rule<AggregationNode>

Rule that transforms selected aggregations from:

 
 - Aggregation[key]: sum(aggr1), sum(aggr2), ..., sum(aggrN)
   - Project:
       aggr1 = CASE WHEN col=1 THEN expr ELSE 0
       aggr2 = CASE WHEN col=2 THEN expr ELSE null
       ...
       aggrN = CASE WHEN col=N THEN expr
     - source
 
 

into:

 
 - Aggregation[key]: sum(aggr1), sum(aggr2), ..., sum(aggrN)
   - Project:
       aggr1 = CASE WHEN col=1 THEN pre_aggregate
       aggr2 = CASE WHEN col=2 THEN pre_aggregate
       ..
       aggrN = CASE WHEN col=N THEN pre_aggregate
     - Aggregation[key, col]: pre_aggregate = sum(expr)
       - source
 
 

Nested Class Summary

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

Rule.Context, Rule.Result

Constructor Summary

Constructors

Constructor	Description
PreAggregateCaseAggregations(PlannerContext plannerContext, IrTypeAnalyzer typeAnalyzer)

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.
boolean	isEnabled(Session session)

Methods inherited from class java.lang.Object

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

Constructor Details

PreAggregateCaseAggregations

public PreAggregateCaseAggregations(PlannerContext plannerContext,
 IrTypeAnalyzer typeAnalyzer)

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>

isEnabled

public boolean isEnabled(Session session)

Specified by:

isEnabled in interface Rule<AggregationNode>

apply

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

Specified by:

apply in interface Rule<AggregationNode>