Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18875#discussion_r137225157 --- 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 -- We can add a todo: `//TODO: support ArrayType(MapType)`, if we don't plan to add the support in this PR.
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