Github user goldmedal 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 --
    yeah, just like @viirya said. This expression is named `StructsToJson`.
    Another reason is that it use `JacksonGenerator` which will need a 
`rowSchema`  when initializing to generate JSON string. Therefore, it must be 
restricted to `StructType` here.
    or can we create another expression to support arbitrary map type?

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