Create a separate namespace for Hive variables
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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'
* Provide a means for differentiating between hiveconf, hivevar, system, and
environment properties in the output of 'set -v'
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