Clarification about ora2pg HOT 4 CLOSED

Ora2pg team - Can i receive some help on my clarification

from ora2pg.

a) where does this limit to 4 billions rows come from?
b) the only limitation I see if the time to parse the oracle catalog, but if it is acceptable for you then this is fine. To parallelize a maximum the data export to save time, you should have a lot of cores and memory on the hosts.
c) to only extract some partitions you should use a WHERE clause that uses the corresponding partition to extract.

from ora2pg.

qsn :a) where does this limit to 4 billions rows come from?

ans : i referred this url

https://jeewansooriyaarachchi.medium.com/oracle-to-postgresql-database-migration-using-ora2pg-b52c998f8508

from ora2pg.

Ah ok, I was thinking of an Ora2Pg limitation.

If you want to export data from a particular partition just use the WHERE clause to gather data from this partition.

from ora2pg.