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From "Sean Hsuan-Yi Chu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-4656) The inferred nullability of "is null" can at times be incorrect
Date Wed, 04 May 2016 21:41:13 GMT

     [ https://issues.apache.org/jira/browse/DRILL-4656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Hsuan-Yi Chu updated DRILL-4656:
-------------------------------------
    Description: 
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 type)
{code}


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

  was:
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


> 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 type)
> {code}
> [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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