StateHint (Flink : Table : Common 2.0.0 API)

```
@PublicEvolving
@Retention(RUNTIME)
@Target({TYPE,METHOD,PARAMETER})
public @interface StateHint
```
A hint that declares an intermediate result (i.e. state entry) that is managed by the framework (i.e. Flink managed state).
State hints are primarily intended for ProcessTableFunction. A PTF supports multiple state entries at the beginning of an eval()/onTimer() method (after an optional context parameter).
Aggregating functions (i.e. AggregateFunction and TableAggregateFunction) support a single state entry at the beginning of an accumulate()/retract() method (i.e. the accumulator).
For example, @StateHint(name = "count", type = @DataTypeHint("BIGINT")) is a state entry with the data type BIGINT named "count".
Note: Usually, a state entry is partitioned by a key and can not be accessed globally. The partitioning (or whether it is only a single partition) is defined by the corresponding function call.

See Also:

FunctionHint

- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  String name
  The name of the state entry.
  
  DataTypeHint type
  The data type hint for the state entry.

- Element Detail
  - name
```
String name
```
    The name of the state entry. It must be unique among other state entries.
    This can be used to provide a descriptive name for the state entry. The name can be used for referencing the entry during clean up.
    
    Default:
    
    ""
- - type
```
DataTypeHint type
```
    The data type hint for the state entry.
    This can be used to provide additional information about the expected data type of the argument. The DataTypeHint annotation can be used to specify the data type explicitly or provide hints for the reflection-based extraction of the data type.
    
    Default:
    
    @org.apache.flink.table.annotation.DataTypeHint