Github user sirpkt commented on the pull request:
https://github.com/apache/tajo/pull/427#issuecomment-87546262
Hi, @jihoonson
Above difference is from the handling of default window frame value.
In Tajo, current window functions works as if window frame is set as "rows
between unbounded preceding and unbounded following"
while default setting of all other DBMSs is "range between unbounded
preceding and current row"
I already posted patch to support correct window frame as TAJO-1415.
So, after that patch, the result will be the same.
Or you can test with window frame setting of "rows between unbounded
preceding and unbounded following" for all window functions.
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