Xiao Li created SPARK-17981:

             Summary: 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: Xiao Li
            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 

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