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 org.apache.flink.table.expressions.LocalReferenceExpression	windowSizeAttribute() The field for the window size.

Method Detail

windowSizeAttribute

default org.apache.flink.table.expressions.LocalReferenceExpression windowSizeAttribute()

The field for the window size.