Package org.apache.cassandra.cql3.functions.masking

Class NullMaskingFunction

java.lang.Object

org.apache.cassandra.cql3.functions.AbstractFunction

org.apache.cassandra.cql3.functions.NativeFunction

org.apache.cassandra.cql3.functions.NativeScalarFunction

org.apache.cassandra.cql3.functions.masking.MaskingFunction

org.apache.cassandra.cql3.functions.masking.NullMaskingFunction

All Implemented Interfaces:

AssignmentTestable, Function, ScalarFunction

public class NullMaskingFunction
extends MaskingFunction

A MaskingFunction that always returns a null column. The returned value is always an absent column, as it didn't exist, and not a not-null column representing a null value.

For example, given a text column named "username", mask_null(username) will always return null, independently of the actual value of that column.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.cql3.functions.masking.MaskingFunction

MaskingFunction.Factory

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

AssignmentTestable.TestResult

Field Summary

Fields

Modifier and Type	Field	Description
static final String	NAME

Fields inherited from class org.apache.cassandra.cql3.functions.masking.MaskingFunction

NAME_PREFIX

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

argTypes, name, returnType

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

UNRESOLVED

Method Summary

Modifier and Type	Method	Description
ByteBuffer	execute(Arguments arguments)	Applies this function to the specified arguments.
static FunctionFactory	factory()
Arguments	newArguments(ProtocolVersion version)	Creates some new input arguments for this function.

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

isAggregate, isCalledOnNullInput, isPartialApplicationMonotonic

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

isNative, isPure, 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, referencesUserType, returnType

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

isMonotonic, partialApplication

Field Details

NAME

public static final String NAME

See Also:

• Constant Field Values

Method Details

newArguments

public Arguments newArguments(ProtocolVersion version)

Description copied from interface: Function

Creates some new input arguments for this function.

Specified by:

newArguments in interface Function

Overrides:

newArguments in class NativeFunction

Parameters:

version - the protocol version

Returns:

some new input arguments for this function

execute

public ByteBuffer execute(Arguments arguments)
                   throws InvalidRequestException

Description copied from interface: ScalarFunction

Applies this function to the specified arguments.

Parameters:

arguments - the input arguments for the function

Returns:

the result of applying this function to the arguments

Throws:

InvalidRequestException - if this function cannot not be applied to the arguments

factory

public static FunctionFactory factory()

Returns:

a FunctionFactory to build new NullMaskingFunctions.