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Posted to dev@hive.apache.org by "Zoltan Haindrich (JIRA)" <ji...@apache.org> on 2018/10/04 08:00:00 UTC

[jira] [Created] (HIVE-20689) Simplifying using predicates should consider not equals in case its a predicate

Zoltan Haindrich created HIVE-20689:
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             Summary: Simplifying using predicates should consider not equals in case its a predicate
                 Key: HIVE-20689
                 URL: https://issues.apache.org/jira/browse/HIVE-20689
             Project: Hive
          Issue Type: Bug
            Reporter: Zoltan Haindrich
            Assignee: Zoltan Haindrich


Right now simplifyUsingPredicates bails out for [all <> comparisions|https://github.com/apache/calcite/blob/c39bfaa02a06ac91575076a6e74f29863923f5eb/core/src/main/java/org/apache/calcite/rex/RexSimplify.java#L1050]; however if it's already an explicit predicate (or its negated one); then it could be demoted to:
{code}
x IS NOT NULL or null
{code}
which could be further simplified in most cases..




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