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https://issues.apache.org/jira/browse/HIVE-1096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804701#action_12804701
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Edward Capriolo commented on HIVE-1096:
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@Prasad,
I do not think we should do anything fancy here, just look for simple ${var}
and replace with var from session state. It could happen that ${ } could appear
in a comment, but not very likely.
>>String substitution will create problems with comments and also with error
>>reporting.
Based on that we should make variables part of the grammar then?
In my example...
{noformat}
hive -hiveconf DAY=5 -e "LOAD DATA INFILE '/tmp/${DAY}' into logs
partition=${DAY}"
{noformat}
Can we make the grammar look inside a string like '/tmp/${DAY}' ?
> Hive Variables
> --------------
>
> Key: HIVE-1096
> URL: https://issues.apache.org/jira/browse/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 Driver.run 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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