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	Description
`static TypeStrategy`	`COMMON`	Type strategy that returns a common, least restrictive type of all arguments.
`static TypeStrategy`	`MISSING`	Placeholder for a missing type strategy.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static TypeStrategy`	`aggArg0(Function<LogicalType,LogicalType> aggType, boolean nullableIfGroupingEmpty)`	Type strategy specific for aggregations that partially produce different nullability depending whether the result is grouped or not.
`static TypeStrategy`	`argument(int pos)`	Type strategy that returns the n-th input argument.
`static TypeStrategy`	`argument(int pos, Function<DataType,Optional<DataType>> mapper)`	Type strategy that returns the n-th input argument, mapping it.
`static TypeStrategy`	`commonRange(ArgumentCount argumentRange)`	Type strategy that returns a common, least restrictive type of selected arguments.
`static TypeStrategy`	`explicit(DataType dataType)`	Type strategy that returns a fixed `DataType`.
`static TypeStrategy`	`first(TypeStrategy... strategies)`	Type strategy that returns the first type that could be inferred.
`static TypeStrategy`	`forceNullable(TypeStrategy initialStrategy)`	Type strategy which forces the given {@param initialStrategy} to be nullable.
`static TypeStrategy`	`mapping(Map<InputTypeStrategy,TypeStrategy> mappings)`	Type strategy that maps an `InputTypeStrategy` to a `TypeStrategy` if the input strategy infers identical types.
`static TypeStrategy`	`matchFamily(int argumentPos, LogicalTypeFamily family)`	Type strategy that returns the given argument if it is of the same logical type family.
`static TypeStrategy`	`nullableIfAllArgs(ConstantArgumentCount includedArgs, TypeStrategy initialStrategy)`	A type strategy that can be used to make a result type nullable if all the selected input arguments are nullable.
`static TypeStrategy`	`nullableIfAllArgs(TypeStrategy initialStrategy)`	A type strategy that can be used to make a result type nullable if all the input arguments is nullable.
`static TypeStrategy`	`nullableIfArgs(ConstantArgumentCount includedArgs, TypeStrategy initialStrategy)`	A type strategy that can be used to make a result type nullable if any of the selected input arguments is nullable.
`static TypeStrategy`	`nullableIfArgs(TypeStrategy initialStrategy)`	A type strategy that can be used to make a result type nullable if any of the input arguments is nullable.
`static TypeStrategy`	`varyingString(TypeStrategy initialStrategy)`	A type strategy that ensures that the result type is either `LogicalTypeRoot.VARCHAR` or `LogicalTypeRoot.VARBINARY` from their corresponding non-varying roots.

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.
  - COMMON
```
public static final TypeStrategy COMMON
```
    Type strategy that returns a common, least restrictive type of all arguments.
- Method Detail
  - commonRange
```
public static TypeStrategy commonRange(ArgumentCount argumentRange)
```
    Type strategy that returns a common, least restrictive type of selected arguments.
  - 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.
  - argument
```
public static TypeStrategy argument(int pos,
                                    Function<DataType,Optional<DataType>> mapper)
```
    Type strategy that returns the n-th input argument, mapping it.
  - first
```
public static TypeStrategy first(TypeStrategy... strategies)
```
    Type strategy that returns the first type that could be inferred.
  - matchFamily
```
public static TypeStrategy matchFamily(int argumentPos,
                                       LogicalTypeFamily family)
```
    Type strategy that returns the given argument if it is of the same logical type family.
  - 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.
  - forceNullable
```
public static TypeStrategy forceNullable(TypeStrategy initialStrategy)
```
    Type strategy which forces the given {@param initialStrategy} to be nullable.
  - nullableIfArgs
```
public static TypeStrategy nullableIfArgs(ConstantArgumentCount includedArgs,
                                          TypeStrategy initialStrategy)
```
    A type strategy that can be used to make a result type nullable if any of the selected input arguments is nullable. Otherwise the type will be not null.
  - nullableIfArgs
```
public static TypeStrategy nullableIfArgs(TypeStrategy initialStrategy)
```
    A type strategy that can be used to make a result type nullable if any of the input arguments is nullable. Otherwise the type will be not null.
  - nullableIfAllArgs
```
public static TypeStrategy nullableIfAllArgs(ConstantArgumentCount includedArgs,
                                             TypeStrategy initialStrategy)
```
    A type strategy that can be used to make a result type nullable if all the selected input arguments are nullable. Otherwise the type will be non-nullable.
  - nullableIfAllArgs
```
public static TypeStrategy nullableIfAllArgs(TypeStrategy initialStrategy)
```
    A type strategy that can be used to make a result type nullable if all the input arguments is nullable. Otherwise the type will be not null.
  - varyingString
```
public static TypeStrategy varyingString(TypeStrategy initialStrategy)
```
    A type strategy that ensures that the result type is either LogicalTypeRoot.VARCHAR or LogicalTypeRoot.VARBINARY from their corresponding non-varying roots.
  - aggArg0
```
public static TypeStrategy aggArg0(Function<LogicalType,LogicalType> aggType,
                                   boolean nullableIfGroupingEmpty)
```
    Type strategy specific for aggregations that partially produce different nullability depending whether the result is grouped or not.

Class TypeStrategies

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MISSING

COMMON

Method Detail

commonRange

explicit

argument

argument

first

matchFamily

mapping

forceNullable

nullableIfArgs

nullableIfArgs

nullableIfAllArgs

nullableIfAllArgs

varyingString

aggArg0