Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18875#discussion_r137973919 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonGenerator.scala --- @@ -26,20 +26,55 @@ import org.apache.spark.sql.catalyst.expressions.SpecializedGetters import org.apache.spark.sql.catalyst.util.{ArrayData, DateTimeUtils, MapData} import org.apache.spark.sql.types._ +/** + * `JackGenerator` can only be initialized with a `StructType` or a `MapType`. + * Once it is initialized with `StructType`, it can be used to write out a struct or an array of + * struct. Once it is initialized with `MapType`, it can be used to write out a map. An exception --- End diff -- `Once it is initialized with ``MapType``, it can be used to write out a map or an array of map.`
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