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From "Edward Capriolo (JIRA)" <>
Subject [jira] Updated: (HIVE-1096) Hive Variables
Date Wed, 24 Nov 2010 15:21:16 GMT


Edward Capriolo updated HIVE-1096:

    Attachment: hive-1096-20.patch.txt

Were two 15 patches. I bumped the number to 20 to clear any confusion.

> Hive Variables
> --------------
>                 Key: HIVE-1096
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Edward Capriolo
>            Assignee: Edward Capriolo
>             Fix For: 0.7.0
>         Attachments: 1096-9.diff, hive-1096-10-patch.txt, hive-1096-11-patch.txt, hive-1096-12.patch.txt,
hive-1096-15.patch.txt, hive-1096-15.patch.txt, hive-1096-2.diff, hive-1096-20.patch.txt,
hive-1096-7.diff, hive-1096-8.diff, hive-1096.diff
> From mailing list:
> --Amazon Elastic MapReduce version of Hive seems to have a nice feature called "Variables."
Basically you can define a variable via command-line while invoking hive with -d DT=2009-12-09
and then refer to the variable via ${DT} within the hive queries. This could be extremely
useful. I can't seem to find this feature even on trunk. Is this feature currently anywhere
in the roadmap?--
> This could be implemented in many places.
> A simple place to put this is 
> in Driver.compile or we can do string substitutions at that level, and further
downstream need not be effected. 
> There could be some benefits to doing this further downstream, parser,plan. but based
on the simple needs we may not need to overthink this.
> I will get started on implementing in compile unless someone wants to discuss this more.

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