c21 commented on a change in pull request #29342: URL: https://github.com/apache/spark/pull/29342#discussion_r470240912
########## File path: core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ########## @@ -428,6 +428,62 @@ public MapIterator destructiveIterator() { return new MapIterator(numValues, new Location(), true); } + /** + * Iterator for the entries of this map. This is to first iterate over key index array + * `longArray` then accessing values in `dataPages`. NOTE: this is different from `MapIterator` + * in the sense that key index is preserved here + * (See `UnsafeHashedRelation` for example of usage). + */ + public final class MapIteratorWithKeyIndex implements Iterator<Location> { + + private int keyIndex = 0; Review comment: @agrawaldevesh - I got your motivation and thank you for concrete suggestion. For `keyIndex` explanation comment I will add here. For `valueIndex` explanation comment I will add in `ShuffledHashJoin.fullOuterJoinWithNonUniqueKey()`, as that is the place to create/use value index. Does it sound good? Thanks ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org