Hello,
Please consider the following test:
create database foo;
\c foo
create table foo_test ( a int );
\c postgres
create extension if not exists postgres_fdw;
create server foo_server foreign data wrapper postgres_fdw options ( dbname 'foo' );
create user mapping for current_user server foo_server;
create foreign table foo_test ( a int not null) server foo_server;
-- insert should return error for because NOT NULL constraint on column a
postgres=# insert into foo_test values ( null );
INSERT 0 1
postgres=# select * from foo_test;
a
---
(1 row)
-- clean up
drop foreign table foo_test;
drop server foo_server cascade;
\c postgres
drop database foo;
Analysis:
As per the PG documentation it says that foreign table do support the
NOT NULL, NULL and DEFAULT.
But when I tried the NOT NULL constraint, its not working for the foreign tables.
Looking at the code into ExecInsert(), for the foreign table missed to call
ExecConstraints(). I am not sure whether it is intentional that we not calling
ExecConstraints() in case of foreign server or its missed.
Do share your thought on this.
I quickly fix the issue by adding ExecConstraints() call for foreign table and
now test behaving as expected. PFA patch for the same.
Regards,
Rushabh Lathia