Ruslan Dautkhanov created HIVE-13076:
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Summary: Implement FK/PK "rely novalidate" constraints for better
CBO
Key: HIVE-13076
URL: https://issues.apache.org/jira/browse/HIVE-13076
Project: Hive
Issue Type: Improvement
Components: CBO, Logical Optimizer
Reporter: Ruslan Dautkhanov
Oracle has "RELY NOVALIDATE" option for constraints.. Could be easier for Hive
to start with something like that for PK/FK constraints. So CBO has more
information for optimizations. It does not have to actually check if that
constraint is relationship is true; it can just "rely" on that constraint..
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#sthref2289
So it would be helpful with join cardinality estimates, and with cases like
this - https://issues.apache.org/jira/browse/HIVE-13019
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