Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/17192#discussion_r106793959 --- 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 -- could we end up with `ArrayType(StructType, something_not_struct)` in this match?
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