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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