Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17192#discussion_r106797619
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -624,41 +627,58 @@ case class StructToJson(
lazy val writer = new CharArrayWriter()
@transient
- lazy val gen =
- new JacksonGenerator(
- child.dataType.asInstanceOf[StructType],
- writer,
- new JSONOptions(options, timeZoneId.get))
+ lazy val gen = new JacksonGenerator(
+ rowSchema, writer, new JSONOptions(options, timeZoneId.get))
+
+ @transient
+ lazy val rowSchema = child.dataType match {
+ case st: StructType => st
+ case ArrayType(st: StructType, _) => st
--- End diff --
Ah, it should be fine. This will be caught in
https://github.com/apache/spark/pull/17192/files/185ea6003d60feed20c56de61c17bc304663d99a#diff-6626026091295ad8c0dfb66ecbcd04b1R663
ahead.
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