Package org.apache.cassandra.cql3.functions

Interface AggregateFunction

All Superinterfaces:

AssignmentTestable, Function

All Known Implementing Classes:

AggregateFcts.CountRowsFunction, 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	Description
static interface	AggregateFunction.Aggregate	An aggregation operation.

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

AssignmentTestable.TestResult

Field Summary

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

UNRESOLVED

Method Summary

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

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

getCompatibleTypeIfKnown, testAssignment

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

addFunctionsTo, argTypes, columnName, compare, isAggregate, isNative, isPure, name, newArguments, referencesUserType, returnType

Method Details

newAggregate

AggregateFunction.Aggregate newAggregate()
                                  throws InvalidRequestException

Creates a new Aggregate instance.

Returns:

a new Aggregate instance.

Throws:

InvalidRequestException