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https://issues.apache.org/jira/browse/DRILL-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14909760#comment-14909760
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ASF GitHub Bot commented on DRILL-3596:
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Github user amansinha100 commented on the pull request:
https://github.com/apache/drill/pull/128#issuecomment-143563550
+1. This review request somehow slipped through the cracks. Sorry about
that.
> 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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