org.apache.flink.table.procedures

Class ProcedureDefinition

java.lang.Object

org.apache.flink.table.procedures.ProcedureDefinition

All Implemented Interfaces:

FunctionDefinition

@Internal
public class ProcedureDefinition
extends Object
implements FunctionDefinition

Definition of a procedure. We consider procedure as a kind of function, so make it implement FunctionDefinition.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PROCEDURE_CALL the name for the methods to be involved in the procedure.

Constructor Summary

Constructors

Constructor and Description
ProcedureDefinition(Procedure procedure)

Method Summary

Modifier and Type	Method and Description
FunctionKind	getKind() Returns the kind of function this definition describes.
TypeInference	getTypeInference(DataTypeFactory typeFactory) Returns the logic for performing type inference of a call to this function definition.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.table.functions.FunctionDefinition

getRequirements, isDeterministic, supportsConstantFolding

Field Detail

PROCEDURE_CALL

public static final String PROCEDURE_CALL

the name for the methods to be involved in the procedure.

See Also:

Constant Field Values

Constructor Detail

ProcedureDefinition

public ProcedureDefinition(Procedure procedure)

Method Detail

getKind

public FunctionKind getKind()

Description copied from interface: FunctionDefinition

Returns the kind of function this definition describes.

Specified by:

getKind in interface FunctionDefinition

getTypeInference

public TypeInference getTypeInference(DataTypeFactory typeFactory)

Description copied from interface: FunctionDefinition

Returns the logic for performing type inference of a call to this function definition.

The type inference process is responsible for inferring unknown types of input arguments, validating input arguments, and producing result types. The type inference process happens independent of a function body. The output of the type inference is used to search for a corresponding runtime implementation.

Instances of type inference can be created by using TypeInference.newBuilder().

See BuiltInFunctionDefinitions for concrete usage examples.

Specified by:

getTypeInference in interface FunctionDefinition