Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18875#discussion_r136997720
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonGenerator.scala
---
@@ -27,21 +27,45 @@ import org.apache.spark.sql.catalyst.util.{ArrayData,
DateTimeUtils, MapData}
import org.apache.spark.sql.types._
private[sql] class JacksonGenerator(
- schema: StructType,
+ childType: DataType,
+ rowSchema: StructType,
--- End diff --
That's said, for now `JacksonGenerator` supports to write out a struct or
an array of struct. After revising, it can also support to write out map, array
of map.
Once a `JacksonGenerator` is initialized with a `MapType`, it is not valid
to call the API `write(row: InternalRow)`.
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