Package org.apache.flink.table.functions

Interface Summary

Interface	Description
FunctionDefinition	Definition of a function.
SpecializedFunction	A FunctionDefinition that can provide a runtime implementation (i.e.
SpecializedFunction.ExpressionEvaluator	Serializable factory that can be passed into a UserDefinedFunction for evaluating previously defined expression during runtime.
SpecializedFunction.ExpressionEvaluatorFactory	Helper interface for creating SpecializedFunction.ExpressionEvaluators.
SpecializedFunction.SpecializedContext	Provides call and session information for the specialized function.
SqlCallSyntax	Provides a format for unparsing BuiltInFunctionDefinitions into a SQL string.
TableAggregateFunction.RetractableCollector<T>	Collects a record and forwards it.

Class Summary

Class	Description
AggregateFunction<T,ACC>	Base class for a user-defined aggregate function.
AggregateFunctionDefinition	Deprecated Non-legacy functions can simply omit this wrapper for declarations.
AsyncLookupFunction	A wrapper class of AsyncTableFunction for asynchronously lookup rows matching the lookup keys from external system.
AsyncScalarFunction	Base class for a user-defined scalar function which returns results asynchronously.
AsyncTableFunction<T>	Base class for a user-defined asynchronous table function.
BuiltInFunctionDefinition	Definition of a built-in function.
BuiltInFunctionDefinition.Builder	Builder for fluent definition of built-in functions.
BuiltInFunctionDefinitions	Dictionary of function definitions for all built-in functions.
FunctionContext	A FunctionContext allows to obtain global runtime information about the context in which the user-defined function is executed.
FunctionIdentifier	Identifies a system function with function name or a catalog function with a fully qualified identifier.
ImperativeAggregateFunction<T,ACC>	Base class for user-defined AggregateFunction and TableAggregateFunction.
LegacyUserDefinedFunctionInference	Deprecated
LookupFunction	A wrapper class of TableFunction for synchronously lookup rows matching the lookup keys from external system.
ScalarFunction	Base class for a user-defined scalar function.
ScalarFunctionDefinition	Deprecated Non-legacy functions can simply omit this wrapper for declarations.
TableAggregateFunction<T,ACC>	Base class for a user-defined table aggregate function.
TableAggregateFunctionDefinition	Deprecated Non-legacy functions can simply omit this wrapper for declarations.
TableFunction<T>	Base class for a user-defined table function.
TableFunctionDefinition	Deprecated Non-legacy functions can simply omit this wrapper for declarations.
TemporalTableFunction	Class representing temporal table function over some history table.
UserDefinedFunction	Base class for all user-defined functions.
UserDefinedFunctionHelper	Utility for dealing with subclasses of UserDefinedFunction.

Enum Summary

Enum	Description
FunctionKind	Categorizes the semantics of a FunctionDefinition.
FunctionRequirement	Characteristics that a FunctionDefinition requires.