[jira] [Created] (HIVE-26733) HiveRelMdPredicates::getPredicate(Project) should return IS_NULL for CAST(NULL)

["Alessandro Solimando (Jira)" <ji...@apache.org>]

Alessandro Solimando created HIVE-26733:
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             Summary: HiveRelMdPredicates::getPredicate(Project) should return IS_NULL for CAST(NULL)
                 Key: HIVE-26733
                 URL: https://issues.apache.org/jira/browse/HIVE-26733
             Project: Hive
          Issue Type: Bug
          Components: CBO
    Affects Versions: 4.0.0-alpha-1
            Reporter: Alessandro Solimando
            Assignee: Alessandro Solimando


Given a _CAST(NULL as $type)_ as i-th project expression, the method returns _(=($i, CAST(null:NULL):$type)_ instead of _IS_NULL($i)_ as in the case of a _NULL_ literal project expression.

This is because _RexLiteral::isNullLiteral_ is used [here|https://github.com/apache/hive/blob/a6c0229f910972e84ba558e728532ffc245cc10d/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/stats/HiveRelMdPredicates.java#L153], while in similar places, it's often convenient to use {_}RexUtil::isNullLiteral(RexNode, boolean allowCast){_}.



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