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From "Ashutosh Chauhan (JIRA)" <>
Subject [jira] [Commented] (HIVE-896) Add LEAD/LAG/FIRST/LAST analytical windowing functions to Hive.
Date Sat, 26 Jan 2013 19:39:14 GMT


Ashutosh Chauhan commented on HIVE-896:

Hey Harish,
Thanks for updating the patch. While I was playing with previous patch, though unit tests
ran fine. I found ptf queries failed when I ran them on cluster. I found out that antlr-runtime
jar is required at tasktracker, so I need to 'add jar' to send it across. This increases our
runtime dependency. Though, thats not my biggest concern. On investigating a bit, I found
this is due to we are serializing antlr structures from client to backend. I think we should
get rid of this. We should populate all the information we need in hive's data structure in
front end  ( probably in *desc objects) and than use these structures to pull out the information.
Having pieces of antlr structures at backend is not ideal. Does the latest patch improves
this situation?
> 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, Hive-896.2.patch.txt
> Windowing functions are very useful for click stream processing and similar time-series/sliding-window
> More details at:
> -- amr

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