Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7882#discussion_r36054584
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -562,6 +562,12 @@ object HiveTypeCoercion {
case Some(finalDataType) => Coalesce(es.map(Cast(_,
finalDataType)))
case None => c
}
+
+ case n @ NaNvl(l, r) if l.dataType != r.dataType =>
+ l.dataType match {
+ case DoubleType => NaNvl(l, Cast(r, DoubleType))
+ case FloatType => NaNvl(Cast(l, DoubleType), r)
--- End diff --
could this throw a bad exception if the input is some other type that is
not Double/Float?
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