Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18875#discussion_r137281077
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonGenerator.scala
---
@@ -22,24 +22,49 @@ import java.io.Writer
import com.fasterxml.jackson.core._
import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
import org.apache.spark.sql.catalyst.expressions.SpecializedGetters
import org.apache.spark.sql.catalyst.util.{ArrayData, DateTimeUtils,
MapData}
import org.apache.spark.sql.types._
private[sql] class JacksonGenerator(
--- End diff --
We should add comment for `JacksonGenerator`. E.g.,
`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 will be thrown if trying to write out a struct if it is
initialized with a `MapType`, and vice verse.
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