Package io.deephaven.api.agg

Class AggregationOptimizer

java.lang.Object

io.deephaven.api.agg.AggregationOptimizer

All Implemented Interfaces:

Aggregation.Visitor

public final class AggregationOptimizer
extends Object
implements Aggregation.Visitor

Optimizes a collection of aggregations by grouping like-specced aggregations together.

Constructor Summary

Constructors

Constructor	Description
AggregationOptimizer()

Method Summary

Modifier and Type	Method	Description
List<Aggregation>	build()
static List<Aggregation>	of(Collection<? extends Aggregation> aggregations)	Optimizes a collection of aggregations by grouping like-specced aggregations together.
void	visit(Aggregations aggregations)	Visit a compound aggregation.
void	visit(ColumnAggregation columnAgg)	Visit a column aggregation.
void	visit(ColumnAggregations columnAggs)	Visit a compound column aggregation.
void	visit(Count count)	Visit a count aggregation.
void	visit(FirstRowKey firstRowKey)	Visit a first row key aggregation.
void	visit(LastRowKey lastRowKey)	Visit a last row key aggregation.
void	visit(Partition partition)	Visit a partition aggregation.

Methods inherited from class java.lang.Object

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

Constructor Details

AggregationOptimizer

public AggregationOptimizer()

Method Details

of

public static List<Aggregation> of(Collection<? extends Aggregation> aggregations)

Optimizes a collection of aggregations by grouping like-specced aggregations together. The input order will be preserved based on the spec-encountered order.

Parameters:

aggregations - the aggregations

Returns:

the optimized aggregations

build

public List<Aggregation> build()

visit

public void visit(Aggregations aggregations)

Description copied from interface: Aggregation.Visitor

Visit a compound aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

aggregations - The compound aggregation to visit

visit

public void visit(ColumnAggregation columnAgg)

Description copied from interface: Aggregation.Visitor

Visit a column aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

columnAgg - The column aggregation to visit

visit

public void visit(ColumnAggregations columnAggs)

Description copied from interface: Aggregation.Visitor

Visit a compound column aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

columnAggs - The compound column aggregation to visit

visit

public void visit(Count count)

Description copied from interface: Aggregation.Visitor

Visit a count aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

count - The count aggregation

visit

public void visit(FirstRowKey firstRowKey)

Description copied from interface: Aggregation.Visitor

Visit a first row key aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

firstRowKey - The first row key aggregation

visit

public void visit(LastRowKey lastRowKey)

Description copied from interface: Aggregation.Visitor

Visit a last row key aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

lastRowKey - The last row key aggregation

visit

public void visit(Partition partition)

Description copied from interface: Aggregation.Visitor

Visit a partition aggregation.

Specified by:

visit in interface Aggregation.Visitor

Parameters:

partition - The partition aggregation