During the last PGSession organized by Dalibo, I wrote and led a workshop
(french) on the migration to PostgreSQL using Foreign Data Wrappers, or FDW.
This was an opportunity to present to the general public the db_migrator
extension for which I wrote an article on this blog.
While working on this workshop, we noticed that copying data with the
db_migrator extension is not perfectly supported. Indeed, although there is a
low-level function to distribute the transfer table by table over several
processes, many situations will require writing a large number of SQL queries to
get out of trouble. Over the following months, I worked on the design of an
assistant written in PL/pgSQL whose purpose is to simplify the generation
of these queries.