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https://issues.apache.org/jira/browse/HIVE-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563596#comment-13563596
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Ashutosh Chauhan commented on HIVE-896:
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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: https://issues.apache.org/jira/browse/HIVE-896
> 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 analytics.
> More details at:
> http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10736/analysis.htm#i1006709
> http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10736/analysis.htm#i1007059
> http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10736/analysis.htm#i1007032
> -- amr
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