cloud-fan commented on a change in pull request #28975:
URL: https://github.com/apache/spark/pull/28975#discussion_r449076851
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinExec.scala
##########
@@ -295,6 +295,10 @@ case class StreamingSymmetricHashJoinExec(
postJoinFilter(joinedRow.withLeft(leftKeyValue.value).withRight(rightValue))
}
}
+
+ // NOTE: we need to make sure `outerOutputIter` is evaluated "after"
exhausting all of
+ // elements in `innerOutputIter`, because evaluation of
`innerOutputIter` may update
+ // the match flag which the logic for outer join is relying on.
Review comment:
Just to clarify: this comment is not related to the bug and just to
document an existing assumption?
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