Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21703#discussion_r200005967
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -179,6 +179,12 @@ object TypeCoercion {
.orElse((t1, t2) match {
case (ArrayType(et1, containsNull1), ArrayType(et2,
containsNull2)) =>
findWiderTypeForTwo(et1, et2).map(ArrayType(_, containsNull1 ||
containsNull2))
+ case (MapType(kt1, vt1, valueContainsNull1), MapType(kt2, vt2,
valueContainsNull2)) =>
--- End diff --
Sure, let me think of it.
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