Xiao Li created SPARK-17981:
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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
cases.
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