In branch-2, with ACID 1.0, following sequence will result in incorrect results
1) Set split strategy to ETL
2) Insert some rows
3) Delete all rows
4) Alter table compact MAJOR
5) Insert some rows
6) Select * query will not return any rows that is written at last (step 5)
The reason for that, compaction essentially voids the first insert in step 2. Now when ETL split strategy is chosen, there will not be any stripes in the base files. So no split gets generated and any subsequent deltas gets ignored.