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https://issues.apache.org/jira/browse/HIVE-23768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez resolved HIVE-23768.
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Fix Version/s: 4.0.0
Resolution: Fixed
> Metastore's update service wrongly strips partition column stats from the
> cache
> -------------------------------------------------------------------------------
>
> Key: HIVE-23768
> URL: https://issues.apache.org/jira/browse/HIVE-23768
> Project: Hive
> Issue Type: Bug
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Critical
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Metastore's update service wrongly strips partition column stats from the
> cache in an attempt to update them. The issue may go unnoticed since missing
> stats do not lead to query failures.
> However, they can alter significantly the query plan affecting performance.
> Moreover, they lead to flakiness since some times the stats are present and
> sometimes are not leading to a query that has a different plan overtime.
> Normally missing elements from the cache shouldn't be a correctness problem
> since we can always fallback to the raw stats. Unfortunately, there are many
> interconnections with other parts of the code (e.g., code to obtain aggregate
> statistics) where this contract breaks.
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