[
https://issues.apache.org/jira/browse/HIVE-23768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17150454#comment-17150454
]
Jesus Camacho Rodriguez commented on HIVE-23768:
------------------------------------------------
+1
> 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
>
> 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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
