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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