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From "Edward Capriolo (JIRA)" <>
Subject [jira] Created: (HIVE-1096) Hive Variables
Date Mon, 25 Jan 2010 18:59:34 GMT
Hive Variables

                 Key: HIVE-1096
             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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