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From "Carl Steinbach (JIRA)" <>
Subject [jira] Commented: (HIVE-1096) Hive Variables
Date Mon, 25 Jan 2010 21:39:34 GMT


Carl Steinbach commented on HIVE-1096:

Wanted to make sure that everyone is aware of HIVE-1063 which aims to
implement simple variable interpolation for test qfiles. The patch I provided
adds a system property variable interpolation mechanism to QTestUtil using
some code I borrowed from Hadoop's Configuration class.

The bug I mention in the JIRA relates to some details of how the test diffs
are compared, and not to the interpolation mechanism itself which I think works

> Hive Variables
> --------------
>                 Key: HIVE-1096
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Edward Capriolo
>            Assignee: Edward Capriolo
> 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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