Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/12836#issuecomment-219901239
@NarineK, yeah, seems you are correct. It is hard to get number of items in
an iterator with iterating it beforehand. So your previous implementation makes
sense. That is:
```
for (each group) {
write rows of the group;
write the row of grouping columns;
}
```
---
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 [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
