SizeBasedWindowFunction (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

CumeDistAggFunction, NTILEAggFunction, PercentRankAggFunction
```
public interface SizeBasedWindowFunction
```
Some functions like CUME_DIST/PERCENT_RANK/NTILE need the size of current window for calculation. Such function need to implement the interface to provide accessing to the window size.
NOTE: Now, it can only be used by DeclarativeAggregateFunction.

- Method Summary
  
  All Methods Instance Methods Default Methods
  Modifier and Type Method Description
  
  default LocalReferenceExpression windowSizeAttribute()
  The field for the window size.

- Method Detail
  - windowSizeAttribute
```
default LocalReferenceExpression windowSizeAttribute()
```
    The field for the window size.