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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