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https://issues.apache.org/jira/browse/HIVE-23557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17119024#comment-17119024
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Jesus Camacho Rodriguez commented on HIVE-23557:
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Thanks [~kgyrtkirk]. Interesting... Shouldn't the call just before that one to
{{optCluster.invalidateMetadataQuery();}} invalidate the cached metadata?
> HiveVolcanoPlanner works with 2 different RelMetadataQuery types which may
> lead to problems
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-23557
> URL: https://issues.apache.org/jira/browse/HIVE-23557
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Priority: Major
>
> switching to trace mode uncovers Volcano estimation issues; which lead to the
> usage of multiple (different) metadataquery sources ; the actual assertion is
> based on the fact that the new metadataquery gives a better estimation for
> the same rel.
> the planner switches over to the default metadataquery provider after some
> time; however this switch may cause trouble - as after this switch the
> already cached internal visited nodesets become incorrect.
> https://github.com/apache/hive/blob/f49d257c560c81c38259e95023b20c544acb4d10/ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java#L2234
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