Zoltan Haindrich created HIVE-23557:
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Summary: 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
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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