beliefer edited a comment on pull request #28685:
URL: https://github.com/apache/spark/pull/28685#issuecomment-651601992


   @hvanhovell Thanks.
   1.Yes, this PR follows up the implement of `LEAD/LEG`, so `NTH_VALUE` is the 
same as `LEAD/LEG`, only works for an unbounded frame (`UNBOUNDED PRECEDING AND 
UNBOUNDED FOLLOWING`).  If we surely need to support bounded frame, I will open 
another PR for this work.
   2.I have checked PostgreSQL, Vertica, Oracle, Redshift, Presto, Teradata, 
`NTH_VALUE` is always used as a window function, not as an aggregate function.


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