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From "Deneche A. Hakim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3596) Allow only (<expression>) or (<expression>, 1) for LEAD and LAG window functions as input parameters
Date Mon, 24 Aug 2015 22:16:45 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14710157#comment-14710157
] 

Deneche A. Hakim commented on DRILL-3596:
-----------------------------------------

[~amansinha100] can you please review ? thx

> Allow only (<expression>) or (<expression>, 1) for LEAD and LAG window functions
as input parameters
> ----------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-3596
>                 URL: https://issues.apache.org/jira/browse/DRILL-3596
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>    Affects Versions: 1.2.0
>            Reporter: Khurram Faraaz
>            Assignee: Aman Sinha
>              Labels: window_function
>             Fix For: 1.2.0
>
>
> We need to disable the third input parameter in LEAD and LAG window functions. We should
support this syntax.
> LEAD(<expression>) ,or LEAD(<expression>,1)
> LAG(<expression>), or LAG(<expression>,1)
> In both the functions above, the second parameter is the default offset value, use of
any other value must he handled and reported to user as error.
> Use of a third input parameter to both the functions must be disallowed.



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