org.apache.flink.table.types.inference

Class TypeStrategies

java.lang.Object

org.apache.flink.table.types.inference.TypeStrategies

@Internal
public final class TypeStrategies
extends Object

Strategies for inferring an output or accumulator data type of a function call.

See Also:

TypeStrategy

Field Summary

Fields

Modifier and Type	Field and Description
static TypeStrategy	ARRAY Type strategy that returns a DataTypes.ARRAY(DataType) with element type equal to the type of the first argument.
static TypeStrategy	MAP Type strategy that returns a DataTypes.MAP(DataType, DataType) with a key type equal to type of the first argument and a value type equal to the type of second argument.
static TypeStrategy	MISSING Placeholder for a missing type strategy.
static TypeStrategy	ROW Type strategy that returns a DataTypes.ROW() with fields types equal to input types.

Method Summary

Modifier and Type	Method and Description
static TypeStrategy	argument(int pos) Type strategy that returns the n-th input argument.
static TypeStrategy	explicit(DataType dataType) Type strategy that returns a fixed DataType.
static TypeStrategy	mapping(Map<InputTypeStrategy,TypeStrategy> mappings) Type strategy that maps an InputTypeStrategy to a TypeStrategy if the input strategy infers identical types.

Methods inherited from class java.lang.Object

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

Field Detail

MISSING

public static final TypeStrategy MISSING

Placeholder for a missing type strategy.

ROW

public static final TypeStrategy ROW

Type strategy that returns a DataTypes.ROW() with fields types equal to input types.

MAP

public static final TypeStrategy MAP

Type strategy that returns a DataTypes.MAP(DataType, DataType) with a key type equal to type of the first argument and a value type equal to the type of second argument.

ARRAY

public static final TypeStrategy ARRAY

Type strategy that returns a DataTypes.ARRAY(DataType) with element type equal to the type of the first argument.

Method Detail

explicit

public static TypeStrategy explicit(DataType dataType)

Type strategy that returns a fixed DataType.

argument

public static TypeStrategy argument(int pos)

Type strategy that returns the n-th input argument.

mapping

public static TypeStrategy mapping(Map<InputTypeStrategy,TypeStrategy> mappings)

Type strategy that maps an InputTypeStrategy to a TypeStrategy if the input strategy infers identical types.