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https://issues.apache.org/jira/browse/HIVE-4394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638798#comment-13638798
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Harish Butani commented on HIVE-4394:
-------------------------------------
Previously we used to return the first/last value in the window if the
evaluation of lag/lead amounted to an index that crossed the boundary. Now we
return the default value. Since in this e.g. we don't have a default value, we
return null.
Also the way we interpret this query maybe different from Postgres. We treat
the lag function as a UDF when it appears as an argument of a UDAF. So we do
the sum in one pass. As far as I know this concept of lead/lag udfs is unique
to us. Is Postgres allowing for UDAFs to be arguments of other UDAFs. We don't
support this.
> test leadlag.q fails
> --------------------
>
> Key: HIVE-4394
> URL: https://issues.apache.org/jira/browse/HIVE-4394
> Project: Hive
> Issue Type: Bug
> Components: PTF-Windowing
> Reporter: Namit Jain
>
> ant test -Dtestcase=TestCliDriver -Dqfile=leadlag.q fails.
> cc [~rhbutani]
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