Github user jmchung commented on a diff in the pull request:
https://github.com/apache/spark/pull/19017#discussion_r134925669
--- 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 --
If I comment out the L451-452, the repeated fields still have the same
jsonValue because `fieldNames(idx) == jsonField`, but the first comparison is
not necessary since `idx >= 0` means matched.
Could you please give me some advice?
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