Rollback after "Connection timed out"?

[Ron <ronljohnsonjr@xxxxxxxxx>]

Pg 9.6.24

On Server_A, I ran:
psql --host=blarge mydb -c "ALTER TABLE blah ..."

After about 2 hours, it displayed this message:
Could not receive data from server: Connection timed out
Connection to server was lost

And yet the ALTER TABLE (it's heavily inheritance-partitioned) is still 
running on blarge.  Is it still working, or is it rolling back (which I'd 
expect to be fast)?

--
Born in Arizona, moved to Babylonia.