[jira] [Commented] (HIVE-2020) Create a separate namespace for Hive variables

["Vaibhav Aggarwal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-2020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13071318#comment-13071318 ] 

Vaibhav Aggarwal commented on HIVE-2020:
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I propose to use -d, --define to define Hive variables.
Amazon ElasticMapreduce is already using this notation for hive variables and variable substitution.

This approach would also clearly separate use of -hiveconf from -d or --define which would be used to purely set hive variables.

This would also maintain consistency for Hive users.

> 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
>
> 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 'var 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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