Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22237#discussion_r220793666 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala --- @@ -554,18 +554,30 @@ case class JsonToStructs( @transient lazy val converter = nullableSchema match { case _: StructType => - (rows: Seq[InternalRow]) => if (rows.length == 1) rows.head else null + (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next() else null case _: ArrayType => - (rows: Seq[InternalRow]) => rows.head.getArray(0) + (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next().getArray(0) else null case _: MapType => - (rows: Seq[InternalRow]) => rows.head.getMap(0) + (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next().getMap(0) else null } - @transient - lazy val parser = - new JacksonParser( - nullableSchema, - new JSONOptions(options + ("mode" -> FailFastMode.name), timeZoneId.get)) + @transient lazy val parser = { + val parsedOptions = new JSONOptions(options, timeZoneId.get) + val mode = parsedOptions.parseMode + if (mode != PermissiveMode && mode != FailFastMode) { --- End diff -- ah i see. If the `mode` option already exist, let's keep it.
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