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. the function's body) that is specialized for the given call and session.
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.
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.
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.
DeclarativeAggregateFunction	API for aggregation functions that are expressed in terms of expressions.
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.
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.
SqlLikeUtils	Utilities for converting SQL LIKE and SIMILAR operators to regular expressions.
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.
TemporalTableFunctionImpl	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.