Github user gczsjdy commented on a diff in the pull request:
https://github.com/apache/spark/pull/16476#discussion_r95732577
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -340,3 +344,96 @@ object CaseKeyWhen {
CaseWhen(cases, elseValue)
}
}
+
+/**
+ * A function that returns the index of expr in (expr1, expr2, ...) list
or 0 if not found.
+ * It takes at least 2 parameters, and all parameters should be subtype of
AtomicType or NullType.
--- End diff --
Because Hive GenericUDFField supports primitive type(includes: boolean,
byte, short, int...) & null.
If the types correspond to Spark SQL, they'll be AtomicType & NullType.
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