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Posted to dev@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2019/08/01 21:42:00 UTC

[jira] [Created] (HIVE-22074) Slow compilation due to IN to OR transformation

Vineet Garg created HIVE-22074:
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             Summary: Slow compilation due to IN to OR transformation
                 Key: HIVE-22074
                 URL: https://issues.apache.org/jira/browse/HIVE-22074
             Project: Hive
          Issue Type: Improvement
          Components: Logical Optimizer
            Reporter: Vineet Garg
            Assignee: Vineet Garg


Currently Hive transform IN expressions to OR to apply various CBO rules. This incur significant performance hit if IN consist of large number of expressions. 
It is better to not transform IN expressions to OR in such cases because overall benefit of various optimizations/transformations is unrealized due to the compilation overhead



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