Package org.apache.cassandra.cql3.functions

Class NativeScalarFunction

java.lang.Object

org.apache.cassandra.cql3.functions.AbstractFunction

org.apache.cassandra.cql3.functions.NativeFunction

org.apache.cassandra.cql3.functions.NativeScalarFunction

All Implemented Interfaces:

AssignmentTestable, Function, ScalarFunction

Direct Known Subclasses:

BytesConversionFcts.FromBlobFunction, BytesConversionFcts.ToBlobFunction, FromJsonFct, MaskingFunction, TimeFcts.FloorDateFunction, TimeFcts.FloorTimestampFunction, TimeFcts.FloorTimeUuidFunction, TimeFcts.TemporalConversionFunction, ToJsonFct, TokenFct

public abstract class NativeScalarFunction
extends NativeFunction
implements ScalarFunction

Base class for the ScalarFunction native classes.

Nested Class Summary

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

AssignmentTestable.TestResult

Field Summary

Fields inherited from class org.apache.cassandra.cql3.functions.AbstractFunction

argTypes, name, returnType

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

UNRESOLVED

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	NativeScalarFunction(String name, AbstractType<?> returnType, AbstractType<?>... argsType)

Method Summary

Modifier and Type	Method	Description
final boolean	isAggregate()	Checks whether the function is an aggregate function or not.
boolean	isCalledOnNullInput()
protected boolean	isPartialApplicationMonotonic(List<ByteBuffer> partialParameters)	Checks if a partial application of the function is monotonic.

Methods inherited from class org.apache.cassandra.cql3.functions.NativeFunction

isNative, isPure, newArguments, withLegacyName

Methods inherited from class org.apache.cassandra.cql3.functions.AbstractFunction

addFunctionsTo, argTypes, argumentsList, columnName, elementKeyspace, elementName, equals, getCompatibleTypeIfKnown, hashCode, name, referencesUserType, returnType, testAssignment, toCqlString, toString, typesMatch

Methods inherited from class java.lang.Object

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

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, isNative, isPure, name, newArguments, referencesUserType, returnType

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

execute, isMonotonic, partialApplication

Constructor Details

NativeScalarFunction

protected NativeScalarFunction(String name,
 AbstractType<?> returnType,
 AbstractType<?>... argsType)

Method Details

isCalledOnNullInput

public boolean isCalledOnNullInput()

Specified by:

isCalledOnNullInput in interface ScalarFunction

isAggregate

public final boolean isAggregate()

Description copied from interface: Function

Checks whether the function is an aggregate function or not.

Specified by:

isAggregate in interface Function

Returns:

true if the function is an aggregate function, false otherwise.

isPartialApplicationMonotonic

protected boolean isPartialApplicationMonotonic(List<ByteBuffer> partialParameters)

Checks if a partial application of the function is monotonic.

A function is monotonic if it is either entirely nonincreasing or nondecreasing.

Parameters:

partialParameters - the input parameters used to create the partial application of the function

Returns:

true if the partial application of the function is monotonic false otherwise.