Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6551#discussion_r31416746
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -47,9 +47,14 @@ object HiveTypeCoercion {
case (t1, NullType) => Some(t1)
// Promote numeric types to the highest of the two and all numeric
types to unlimited decimal
+ // Promote numeric types to String if one is string type and the other
is numeric type
case (t1, t2) if Seq(t1, t2).forall(numericPrecedence.contains) =>
--- End diff --
`numericPrecedence` doesn't contain `StringType`, you need to write a
separate case like `case (t1 @ StringType(), t2 @ NumericType())`.
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