Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21713#discussion_r200315553
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -166,6 +166,30 @@ object TypeCoercion {
case (l, r) => None
}
+ private def mergeComplexTypes(
+ t1: DataType,
+ t2: DataType,
--- End diff --
Seems like the behavior will be changed if we reuse there, and the test
[TypeCoercionSuite.scala#L397-L400](https://github.com/apache/spark/blob/bed6849dbf51e1981772cd353ce1a7ae4f0626e2/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercionSuite.scala#L397-L400)
fails.
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