$ pg_dump -h postgreshost -f mydb.sql mydb
$ perl roachize.pl --source mydb.sql --dest mydb_for_cockroach.sql
$ psql -h cockroachhost ... -d mydb < mydb_for_cockroach.sql
This is a HACK script to take a SQL (default) format output of pg_dump and emit a modified version that can be run against a cockroachdb instance. It is probably dependent on the versions of postgres I'm using and cockroach - 9.6 and 1.1.3
It depends on the structure of the SQL output from the pg_dump comand so isn't going to work on a random sql file of postgres commands.
What it does:
Processes the entire file looking for the primary key definitions to hoist into
the CREATE TABLE expressions- pg_dump creates the tables and adds the primary
key constraints later. Cockroachdb requires the primary key to be defined at
table creation. It also notices the creation of foreign key constraints and
remembers them to explicitly create indexes for them. Postgres auto-creates them
but cockroach does not and fails creating the constraints if the indexes do not
exist. It dumps the DDL for them as a block when it finds an explicit CREATE INDEX which means this is after all tables have been created in a pg_dump
It then rewinds and starts processing the the file again, emitting the altered
CREATE TABLE commands and changing any primary keys that are integers into SERIAL.
It comments out:
CREATE SEQUENCE
ALTER TABLE ... PRIMARY KEY statemnts as they are already defined
GRANT
REVOKE
COMMENT ON
ALTER SEQUENCE
SET
CREATE EXTENSION
ALTER TABLE \S+ OWNER
ALTER TABLE.*nextval
SELECT pg_catalog)/-- \1/;
It removes the following unsupported expressions:
USING btree
DEFERRABLE INITIALLY DEFERRED
ON DELETE SET NULL;
You can skip the COPY sections during debugging to speed up imports using the --omitdata option.