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From hsuanyi <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-4577: Construct a specific path for quer...
Date Thu, 14 Apr 2016 20:51:30 GMT
Github user hsuanyi commented on the pull request:

    https://github.com/apache/drill/pull/461#issuecomment-210144139
  
    In the background, Chun, Rahul and Jinfeng have done some experiments:
    1. Functional-wise: If Hive uses storage-based impersonation, when a user does "Show Tables"
on Hive (without going through DRILL), this user will see the tables which might not be under
his/her permission. So from the aspect, the behavior of Drill matches Hive with respect to
visibility of tables displayed.  
    
    2. Performance-wise: 
    For INFORMATION_SCHEMA query against a hive instance with 1000 tables (impersonation was
off), 
    we got 38 seconds when the patch is not applied (non bulk load), and 8 seconds is when
the patch is applied (bulk load).


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