Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22017#discussion_r209485487
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -231,6 +231,15 @@ object TypeCoercion {
})
}
+ /**
+ * Similar to [[findTightestCommonType]] but with string promotion.
+ */
+ def findWiderTypeForTwoExceptDecimals(t1: DataType, t2: DataType):
Option[DataType] = {
--- End diff --
I submitted a pr #22086.
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