ItemAtTypeStrategy (Flink : Table : Common 2.0-preview1 API)

java.lang.Object
- org.apache.flink.table.types.inference.strategies.ItemAtTypeStrategy

All Implemented Interfaces:

TypeStrategy
```
@Internal
public final class ItemAtTypeStrategy
extends Object
implements TypeStrategy
```
An output type strategy for BuiltInFunctionDefinitions.AT.
Returns either the element of an LogicalTypeFamily.COLLECTION type or the value of LogicalTypeRoot.MAP.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  ItemAtTypeStrategy()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  Optional<DataType> inferType(CallContext callContext)
  Infers a type from the given function call.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ItemAtTypeStrategy
```
public ItemAtTypeStrategy()
```
- Method Detail
  - inferType
```
public Optional<DataType> inferType(CallContext callContext)
```
    Description copied from interface: TypeStrategy
    
    Infers a type from the given function call.
    
    Specified by:
    
    inferType in interface TypeStrategy