Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14251#discussion_r71276925
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -100,7 +100,8 @@ object TypeCoercion {
}
/** Similar to [[findTightestCommonType]], but can promote all the way
to StringType. */
- private def findTightestCommonTypeToString(left: DataType, right:
DataType): Option[DataType] = {
+ private[catalyst] def findTightestCommonTypeToString(left: DataType,
right: DataType)
--- End diff --
Oh, sure. I will make this `public`.
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