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  1. Hive
  2. HIVE-13076

Implement FK/PK "rely novalidate" constraints for better CBO

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Implemented
    • None
    • None
    • CBO, Logical Optimizer
    • None

    Description

      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

      Attachments

        1. AddingPKFKconstraints.pdf
          153 kB
          Hari Sankar Sivarama Subramaniyan

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              hsubramaniyan Hari Sankar Sivarama Subramaniyan
              Tagar Ruslan Dautkhanov
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                Updated:
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