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https://issues.apache.org/jira/browse/HIVE-4394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638514#comment-13638514
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Ashutosh Chauhan commented on HIVE-4394:
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I think whats happening. For rows where column value can't be computed (e.g.
first row of lag function) we return null, whereas earlier we use to return
current value. I am not sure whats correct (or what standard says) but
postgres atleast seems to do what we were doing earlier (ie, return current
column value).
> 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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