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From Venky Iyer <>
Subject Re: [jira] [Commented] (HIVE-896) Add LEAD/LAG/FIRST/LAST analytical windowing functions to Hive.
Date Thu, 31 Jan 2013 19:10:44 GMT

On 1/31/13 11:01 AM, "Ashutosh Chauhan (JIRA)" <> wrote:

-13567950 ] 

Ashutosh Chauhan commented on HIVE-896:

Thanks Prajakta for explanation. Make sense, But to your last point which
Harish also noted in previous comment:
bq. So currently, we are filtering the VCs and setting up a new
RowResolver for ExtractOperator during translation so that the columns at
runtime match with those during translation.
I think we cannot always filter out VC's for RR of ExtractOp. That will
depend on whether user has selected VCs or not in the query. No?
> Add LEAD/LAG/FIRST/LAST analytical windowing functions to Hive.
> ---------------------------------------------------------------
>                 Key: HIVE-896
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: OLAP, UDF
>            Reporter: Amr Awadallah
>            Priority: Minor
>         Attachments: DataStructs.pdf, HIVE-896.1.patch.txt,
> Windowing functions are very useful for click stream processing and
>similar time-series/sliding-window analytics.
> More details at:
> -- amr

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