Github user viirya commented on a diff in the pull request:
    --- Diff: 
    @@ -659,13 +660,19 @@ case class StructsToJson(
             (arr: Any) =>
    +      case MapType(_: DataType, _: StructType, _: Boolean) =>
    +        (map: Any) =>
    +          val mapType = child.dataType.asInstanceOf[MapType]
    +          gen.write(map.asInstanceOf[MapData], mapType)
    +          getAndReset()
       override def dataType: DataType = StringType
       override def checkInputDataTypes(): TypeCheckResult = child.dataType 
match {
    -    case _: StructType | ArrayType(_: StructType, _) =>
    +    case _: StructType | ArrayType(_: StructType, _) |
    +         MapType(_: DataType, _: StructType, _: Boolean) =>
    --- End diff --
    I was thinking that the function name for `StructsToJson` might be similar 
word, but looks it is just `to_json`, there is no wording of struct. Yeah, if 
so, `StructsToJson` is not public API so I think it is fine to change it.
    Because this is his first PR, I'd prefer less complexity for him. And to 
support an arbitrary Map type needs to change few more places and makes review 
process longer. It should be great if we can let this in and @goldmedal can 
work on another PR.

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