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From "Harish Butani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4394) test leadlag.q fails
Date Tue, 23 Apr 2013 05:27:15 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638798#comment-13638798
] 

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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