Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18875#discussion_r131930238 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala --- @@ -659,13 +660,19 @@ case class StructsToJson( (arr: Any) => gen.write(arr.asInstanceOf[ArrayData]) getAndReset() + 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. Looks like `writeMapData` support writing out all kind of fields. I think we can remove this limit.
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