com.apple.foundationdb.record.metadata

Class IndexAggregateFunction

java.lang.Object

com.apple.foundationdb.record.metadata.IndexAggregateFunction

All Implemented Interfaces:

PlanHashable

Direct Known Subclasses:

TimeWindowAggregateFunction

@API(value=MAINTAINED)
public class IndexAggregateFunction
extends Object
implements PlanHashable

An aggregate function implemented by scanning an appropriate index.

See Also:

FunctionNames, FDBRecordStore.evaluateAggregateFunction(java.util.List<java.lang.String>, com.apple.foundationdb.record.metadata.IndexAggregateFunction, com.apple.foundationdb.record.TupleRange, com.apple.foundationdb.record.IsolationLevel)

Constructor Summary

Constructors

Constructor and Description
IndexAggregateFunction(String name, KeyExpression operand, String index)

Method Summary

Modifier and Type	Method and Description
TupleRange	adjustRange(EvaluationContext context, TupleRange tupleRange)
IndexAggregateFunction	cloneWithIndex(String index)
IndexAggregateFunction	cloneWithOperand(KeyExpression operand)
boolean	equals(Object o)
String	getIndex()
String	getName()
KeyExpression	getOperand()
int	hashCode()
int	planHash() Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.
String	toString()
void	validate(Descriptors.Descriptor descriptor)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.apple.foundationdb.record.PlanHashable

combineHashes, iterablePlanHash, objectPlanHash, objectsPlanHash, planHash, planHash, planHashUnordered, stringHashUnordered

Constructor Detail

IndexAggregateFunction

public IndexAggregateFunction(@Nonnull
                              String name,
                              @Nonnull
                              KeyExpression operand,
                              @Nullable
                              String index)

Method Detail

getName

@Nonnull
public String getName()

getOperand

@Nonnull
public KeyExpression getOperand()

getIndex

@Nullable
public String getIndex()

cloneWithOperand

@Nonnull
public IndexAggregateFunction cloneWithOperand(@Nonnull
                                                        KeyExpression operand)

cloneWithIndex

@Nonnull
public IndexAggregateFunction cloneWithIndex(@Nonnull
                                                      String index)

validate

public void validate(@Nonnull
                     Descriptors.Descriptor descriptor)

adjustRange

@Nonnull
public TupleRange adjustRange(@Nonnull
                                       EvaluationContext context,
                                       @Nonnull
                                       TupleRange tupleRange)

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

planHash

public int planHash()

Description copied from interface: PlanHashable

Return a hash similar to hashCode, but with the additional guarantee that is is stable across JVMs.

Specified by:

planHash in interface PlanHashable

Returns:

a stable hash code