Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18875#discussion_r137224595
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -661,6 +666,10 @@ case class StructsToJson(
(arr: Any) =>
gen.write(arr.asInstanceOf[ArrayData])
getAndReset()
+ case MapType(_: DataType, _: DataType, _: Boolean) =>
--- End diff --
For arbitrary map, we can simply write `case _: MapType => `
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