Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18875#discussion_r138058166
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonGenerator.scala
---
@@ -26,20 +26,53 @@ 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 or an array
--- End diff --
nit: ``` ``MapType`` ``` -> `` `MapType` ``
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