Apache Spark reassigned SPARK-17981:

    Assignee: Apache Spark  (was: Xiao Li)

> Incorrectly Set Nullability to False in FilterExec
> --------------------------------------------------
>                 Key: SPARK-17981
>                 URL: https://issues.apache.org/jira/browse/SPARK-17981
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.1, 2.1.0
>            Reporter: Xiao Li
>            Assignee: Apache Spark
>            Priority: Critical
> When FilterExec contains isNotNull, which could be inferred and pushed down 
> or users specified, we convert the nullability of the involved columns if the 
> top-layer expression is null-intolerant. However, this is not true, if the 
> top-layer expression is not a leaf expression, it could still tolerate the 
> null when it has null-tolerant child expression. 
> For example, cast(coalesce(a#5, a#15) as double). Although cast is a 
> null-intolerant expression, but obviously coalesce is a null-tolerant. 
> When the nullability is wrong, we could generate incorrect results in 
> different cases.

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