[HIVE-210] Refactor HiveConf variables into two categories (query and session level) - ASF JIRA

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Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: Clients
Labels:
None

Description

Created while fixing ~~HIVE-84~~.

Most of variables in HiveConf fall into two distinct categories: valid only for a job (job name, id etc) and valid across sessions and jobs. So it may be good idea to explicitly distinguish them so that changes in HiveConf object can be detected and acted appropriately.

I suppose this requites a sizable refactoring of the code in SessionState, HiveConf & Hive classes.