Github user felixcheung commented on a diff in the pull request: https://github.com/apache/spark/pull/17192#discussion_r106794013 --- 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 + } + + // This converts rows to the JSON output according to the given schema. + @transient + lazy val converter: Any => UTF8String = { + def getAndReset(): UTF8String = { + gen.flush() + val json = writer.toString + writer.reset() + UTF8String.fromString(json) + } + + child.dataType match { + case _: StructType => + (row: Any) => + gen.write(row.asInstanceOf[InternalRow]) + getAndReset() + case ArrayType(_: StructType, _) => + (arr: Any) => + gen.write(arr.asInstanceOf[ArrayData]) + getAndReset() + } + } override def dataType: DataType = StringType - override def checkInputDataTypes(): TypeCheckResult = { - if (StructType.acceptsType(child.dataType)) { + override def checkInputDataTypes(): TypeCheckResult = child.dataType match { + case _: StructType | ArrayType(_: StructType, _) => --- End diff -- this seems to become a bit more strict from before? was: `StructType.acceptsType` - anything can be accepted as struct now: `match { case _: StructType` - must be struct am I understand this correctly?
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