[jira] [Created] (DRILL-4656) The inferred nullability of "is null" can at times be incorrect

["Sean Hsuan-Yi Chu (JIRA)" <ji...@apache.org>]

Sean Hsuan-Yi Chu created DRILL-4656:
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             Summary: The inferred nullability of "is null" can at times be incorrect
                 Key: DRILL-4656
                 URL: https://issues.apache.org/jira/browse/DRILL-4656
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
            Reporter: Sean Hsuan-Yi Chu


In SQL, the nullability of "is null" should always be non-nullable, regardless of the input type.

Because of the short-cut here [1], the nullability is true. That shortcut is to avoid the following failure in WHERE clause:
{code}
WHERE booleanFunc(ANY)
{code}

Thus, instead of terminating the logic some early, Drill should have kept going down till function resolution.

[1] https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/TypeInferenceUtils.java#L250



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