org.apache.flink.table.planner.functions.aggfunctions

Interface SizeBasedWindowFunction

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

Modifier and Type	Method and Description
default LocalReferenceExpression	windowSizeAttribute() The field for the window size.

Method Detail

windowSizeAttribute

default LocalReferenceExpression windowSizeAttribute()

The field for the window size.