Sergey Shelukhin created HIVE-18851:

             Summary: make Hive basic stats valid for ACID; cleanup and 
refactor the code
                 Key: HIVE-18851
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin

Based on HIVE-18571 that started as a couple small fixes for MM tables, but 
ends up making stats for ACID tables work better in general, but not rigorously 
and not for all cases.
Overall I've discovered that Hive stats code is spread all over in random 
places in code base and is brittle and inconsistent, esp. for any complex 
scenario like ACID tables. 
I think at the minimum it should be moved to a single spot (so that e.g. 
BasicStatsTask, BasicStatsTaskNoJob, metastore stats generation, etc all use 
the same code with the same logic) and made valid for ACID.

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