[ https://issues.apache.org/jira/browse/HIVE-26978 ]
Zoltan Haindrich deleted comment on HIVE-26978:
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was (Author: kgyrtkirk):
have you restarted the HS2?
the runtime stats are cached there; the metastore only stores them
> Stale "Runtime stats" causes poor query planning
> ------------------------------------------------
>
> Key: HIVE-26978
> URL: https://issues.apache.org/jira/browse/HIVE-26978
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Reporter: Rajesh Balamohan
> Priority: Major
> Labels: performance
> Attachments: Screenshot 2023-01-24 at 10.23.16 AM.png
>
>
> * Runtime stats can be stored in hiveserver or in metastore via
> "hive.query.reexecution.stats.persist.scope".
> * Though the table is dropped and recreated, it ends up showing old stats
> via "RUNTIME" stats. Here is an example (note that the table is empty, but
> gets datasize and numRows from RUNTIME stats)
> * This causes suboptimal plan for "MERGE INTO" queries by creating
> CUSTOM_EDGE instead of broadcast edge.
> !Screenshot 2023-01-24 at 10.23.16 AM.png|width=2053,height=753!
>
>
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