TypeStrategies (Flink : 1.20-SNAPSHOT API)

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`	`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 and 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`	`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 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
  - 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 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.

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Class TypeStrategies

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MISSING

COMMON

Method Detail

explicit

argument

argument

first

matchFamily

mapping

forceNullable

nullableIfArgs

nullableIfArgs

nullableIfAllArgs

nullableIfAllArgs

varyingString

aggArg0

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