Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/12836#issuecomment-219383918
@NarineK
2.1) yeah, seems it is possbile to directly write a Row in SerDe to R
worker. So key is a Row, you can directly WriteObject(key)
2.2) To re-use current logic, you can
```
for (each group ) {
write number of rows;
write the all rows in the group;
}
```
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