org.apache.cassandra.cql3.functions

Interface AggregateFunction

All Superinterfaces:

AssignmentTestable, Function

All Known Implementing Classes:

NativeAggregateFunction, UDAggregate

public interface AggregateFunction
extends Function

Performs a calculation on a set of values and return a single value.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	AggregateFunction.Aggregate An aggregation operation.

Nested classes/interfaces inherited from interface org.apache.cassandra.cql3.AssignmentTestable

AssignmentTestable.TestResult

Method Summary

Modifier and Type	Method and Description
AggregateFunction.Aggregate	newAggregate() Creates a new Aggregate instance.

Methods inherited from interface org.apache.cassandra.cql3.functions.Function

addFunctionsTo, argTypes, columnName, hasReferenceTo, isAggregate, isNative, name, returnType

Methods inherited from interface org.apache.cassandra.cql3.AssignmentTestable

testAssignment

Method Detail

newAggregate

AggregateFunction.Aggregate newAggregate()
                                  throws InvalidRequestException

Creates a new Aggregate instance.

Returns:

a new Aggregate instance.

Throws:

InvalidRequestException