Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/19017#discussion_r134923877 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala --- @@ -447,7 +448,18 @@ case class JsonTuple(children: Seq[Expression]) generator => copyCurrentStructure(generator, parser) } - row(idx) = UTF8String.fromBytes(output.toByteArray) + val jsonValue = UTF8String.fromBytes(output.toByteArray) + row(idx) = jsonValue + idx = idx + 1 + + // SPARK-21804: json_tuple returns null values within repeated columns + // except the first one; so that we need to check the remaining fields. + while (idx < fieldNames.length) { + if (fieldNames(idx) == jsonField) { + row(idx) = jsonValue + } + idx = idx + 1 + } --- End diff -- You still can simplify the codes a lot without functional transformation.
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