Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18875#discussion_r137224911
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -640,6 +644,7 @@ case class StructsToJson(
lazy val rowSchema = child.dataType match {
case st: StructType => st
case ArrayType(st: StructType, _) => st
+ case MapType(_: DataType, _: DataType, _) => child.dataType
--- End diff --
case mt: MapType => mt
---
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