[jira] [Updated] (HIVE-18851) make Hive basic stats valid for ACID; clean up and refactor the code

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Shelukhin updated HIVE-18851:
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    Summary: make Hive basic stats valid for ACID; clean up and refactor the code  (was: make Hive basic stats valid for ACID; cleanup and refactor the code)

> make Hive basic stats valid for ACID; clean up and refactor the code
> --------------------------------------------------------------------
>
>                 Key: HIVE-18851
>                 URL: https://issues.apache.org/jira/browse/HIVE-18851
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Priority: Major
>
> 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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