Question about CompactRange behavior with option atomic_flush=true

[max-509]

Hi RocksDB community!

When I set option atomic_flush=true, CompactRange() function flushes all CFs in database instance. But with atomic_flush=false CompactRange() flushes only provided CF. Same behavior in IngestExternalFiles().

In Flush(const FlushOptions&, ColumnFamilyHandle*) function only single CF will be flushed with atomic_flush=true.

I tried to find explanation of this behavior in original commit that introduced this option (#4023), but not found. Can someone explain me is it bug or expected behavior?

I understand that it can be related to case, where we open database with disableWAL=true option, but in my case I want to make manual compaction for only selected CF.

If it turns out to be a bug, can I submit PR with fixes?