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Date: Fri, 2 Sep 2011 12:46:09 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Commented] (HIVE-2020) Create a separate namespace for Hive
 variables
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    [ https://issues.apache.org/jira/browse/HIVE-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095951#comment-13095951 ] 

Hudson commented on HIVE-2020:
------------------------------

Integrated in Hive-0.8.0-SNAPSHOT-h0.21 #5 (See [https://builds.apache.org/job/Hive-0.8.0-SNAPSHOT-h0.21/5/])
    HIVE-2020. Create a separate namespace for Hive variables (Vaibhav Aggarwal via cws)

cws : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1164320
Files : 
* /hive/branches/branch-0.8/cli/src/java/org/apache/hadoop/hive/cli/CliDriver.java
* /hive/branches/branch-0.8/cli/src/java/org/apache/hadoop/hive/cli/OptionsProcessor.java
* /hive/branches/branch-0.8/ql/src/java/org/apache/hadoop/hive/ql/parse/VariableSubstitution.java
* /hive/branches/branch-0.8/ql/src/java/org/apache/hadoop/hive/ql/processors/SetProcessor.java
* /hive/branches/branch-0.8/ql/src/java/org/apache/hadoop/hive/ql/session/SessionState.java
* /hive/branches/branch-0.8/ql/src/test/queries/clientpositive/set_variable_sub.q
* /hive/branches/branch-0.8/ql/src/test/results/clientpositive/set_variable_sub.q.out


> Create a separate namespace for Hive variables
> ----------------------------------------------
>
>                 Key: HIVE-2020
>                 URL: https://issues.apache.org/jira/browse/HIVE-2020
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Carl Steinbach
>            Assignee: Vaibhav Aggarwal
>             Fix For: 0.8.0
>
>         Attachments: HIVE-2020-2.patch, HIVE-2020-3.patch, HIVE-2020.patch
>
>
> Support for variable substitution was added in HIVE-1096. However, variable substitution was implemented by reusing the HiveConf namespace, so there is no separation between Hive configuration properties and Hive variables.
> This ticket encompasses the following enhancements:
> * Create a separate namespace for managing Hive variables.
> * Add support for setting variables on the command line via '-hivevar x=y'
> * Add support for setting variables through the CLI via 'set hivevar:x=y'
> * Add support for referencing variables in statements using either '${hivevar:var_name}' or '${var_name}'
> * Provide a means for differentiating between hiveconf, hivevar, system, and environment properties in the output of 'set -v'

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