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https://issues.apache.org/jira/browse/HIVE-18571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387121#comment-16387121
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Sergey Shelukhin commented on HIVE-18571:
-----------------------------------------
The stats changes in select explain plans are due to disappearing incorrect
stats.
For example. table in acid_nullscan has 11 rows, but stats currently report 1
row because of the last transaction inserting 1 row (I think).
New results report 88 rows because stats don't have row count at all; therefore
row count in explain is generated based on some heuristic.
> stats issues for MM tables
> --------------------------
>
> Key: HIVE-18571
> URL: https://issues.apache.org/jira/browse/HIVE-18571
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Priority: Major
> Attachments: HIVE-18571.01.patch, HIVE-18571.02.patch,
> HIVE-18571.03.patch, HIVE-18571.04.patch, HIVE-18571.patch
>
>
> There are multiple stats aggregation issues with MM tables.
> Some simple stats are double counted and some stats (simple stats) are
> invalid for ACID table dirs altogether.
> I have a patch almost ready, need to fix some more stuff and clean up.
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