Andrew Dunstan: Using PostgreSQL 9.5's IMPORT FOREIGN SCHEMA

This is a pretty nice feature in 9.5. The other day I needed to look at some data from a WordPress site that's stored in MySQL. I had a dump of the data, but I'm not terribly proficient at using MySQL tools or their SQL dialect, so I thought I would try out just importing the schema to PostgreSQL using the new IMPORT FOREIGN SCHEMA command. It worked pretty well. First I installed the Postgres rpms from the community repository. Unfortunately, the repository doesn't have the latest mysql foreign data wrapper for 9.5, so I cloned it from github and built and installed it without difficulties. Then I restored the backup into the test database on local mysql instance. Then there was a small glitch. When I tried to import the schema it complained that it didn't know about the type "tinytext". So I created a domain for this that just mapped it to text. and then re-ran the import, and it worked just fine. Here is the whole import session:

[andrew@dino mysql_fdw]$ psql wp
psql (9.5.0)
Type "help" for help.

wp=# create extension mysql_fdw;
CREATE EXTENSION
wp=# CREATE SERVER mysql_server
         FOREIGN DATA WRAPPER mysql_fdw
         OPTIONS (host '127.0.0.1', port '3306');
CREATE SERVER
wp=# create user mapping for andrew server mysql_server;
CREATE USER MAPPING
wp=# import FOREIGN SCHEMA test from server mysql_server into public;
ERROR:  type "tinytext" does not exist
LINE 4:   comment_author tinytext NOT NULL,
                         ^
QUERY:  CREATE FOREIGN TABLE wp_comments (
  "comment_ID" bigint NOT NULL,
  "comment_post_ID" bigint NOT NULL,
  comment_author tinytext NOT NULL,
  comment_author_email varchar NOT NULL,
  comment_author_url varchar NOT NULL,
  "comment_author_IP" varchar NOT NULL,
  comment_date timestamp NOT NULL,
  comment_date_gmt timestamp NOT NULL,
  comment_content text NOT NULL,
  comment_karma int NOT NULL,
  comment_approved varchar NOT NULL,
  comment_agent varchar NOT NULL,
  comment_type varchar NOT NULL,
  comment_parent bigint NOT NULL,
  user_id bigint NOT NULL
) SERVER mysql_server OPTIONS (dbname 'test', table_name 'wp_comments');

CONTEXT:  importing foreign table "wp_comments"
wp=# create domain tinytext as text;
CREATE DOMAIN
wp=# import FOREIGN SCHEMA test from server mysql_server into public;
IMPORT FOREIGN SCHEMA
wp=#