Stamatis Zampetakis created HIVE-23768:
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Summary: 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
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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