DB Tsai created SPARK-20291:
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Summary: NaNvl(FloatType, NullType) should not be cast to
NaNvl(DoubleType, DoubleType)
Key: SPARK-20291
URL: https://issues.apache.org/jira/browse/SPARK-20291
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.1.0, 2.0.2, 2.0.1, 2.0.0
Reporter: DB Tsai
Assignee: DB Tsai
`NaNvl(float value, null)` will be converted into `NaNvl(float value,
Cast(null, DoubleType))` and finally `NaNvl(Cast(float value, DoubleType),
Cast(null, DoubleType))`.
This will cause mismatching in the output type when the input type is float.
By adding extra rule in TypeCoercion can resolve this issue.
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