IngestExternalFile put file on bottom level but on db_paths[0]

[rockeet]

Expected behavior

IngestExternalFile should put file on db_paths according to level.

Actual behavior

IngestExternalFile put file on bottom level but on db_paths[0].

Steps to reproduce the behavior

1. Set Options with level style compaction
2. Set Options with multiple db_paths
3. Open db with defined Options
4. IngestExternalFile

[rockeet]

Is there any progress?

[lhsoft]

IngestExternalFile func link/copy the sst file to db_paths[0] in preparing stage and assign the level to sst file in run stage。 This is why put file on bottom level but on db_paths[0]. In order to fix it, we need to get the correct level of sst file before link/copy

[rockeet]

Is there any progress?