Passing relation metadata to Exec routine

Hi hackers!

While working on Pluggable TOAST [1] we found out that creation
of new relation with CREATE TABLE AS... or CREATE TABLE LIKE -
method
static ObjectAddress create_ctas_internal(List *attrList, IntoClause *into)
does not receive any metadata from columns or tables used in query
(if any). It makes sense to pass not only column type and size, but
all other metadata - like attoptions,base relation OID (and, maybe,
reloptions), if the column from existing relation was used.

A good example is the creation of new relation from base one where
some other Toaster was assigned to a column - it seems reasonable
that the same column in new table must have the same Toaster assigned
as the base one. And we already have a couple of other practical uses
for the metadata passed along with column definitions.

Any thoughts or suggestions?

[1] https://commitfest.postgresql.org/41/3490/

--
Regards,
Nikita Malakhov
Postgres Professional
https://postgrespro.ru/