Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1366#issuecomment-48759522
@aarondav, you are totally right. However, the `Aggregate` operator that
this is replacing made the same assumption and this approach will use strictly
less memory.
For the 1.2 release I'd like to focus on external algorithms and hopefully
start using more of sparks built in data structures for this.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
