Issues with privileges carrying over after alter table owner

[Jorge Torralba <jorge.torralba@xxxxxxxxx>]

we have added some default users to the template1 db so we can grant ro and rw privs as needed per owner.

For example

If I create table "yyy" as a special user with a set of privileges, the grantee and gantor data from thopse privs are there.

jorge_dev=# select * from information_schema.table_privileges where table_name = 'yyy';

  grantor  |  grantee   | table_catalog | table_schema | table_name | privilege_type | is_grantable | with_hierarchy

-----------+------------+---------------+--------------+------------+----------------+--------------+----------------

 migration | read_write | jorge_dev     | public       | yyy        | INSERT         | NO           | NO

 migration | read_write | jorge_dev     | public       | yyy        | SELECT         | NO           | YES

 migration | read_write | jorge_dev     | public       | yyy        | UPDATE         | NO           | NO

 migration | read_write | jorge_dev     | public       | yyy        | DELETE         | NO           | NO

 migration | read_only  | jorge_dev     | public       | yyy        | SELECT         | NO           | YES

 migration | migration  | jorge_dev     | public       | yyy        | INSERT         | YES          | NO

 migration | migration  | jorge_dev     | public       | yyy        | SELECT         | YES          | YES

 migration | migration  | jorge_dev     | public       | yyy        | UPDATE         | YES          | NO

 migration | migration  | jorge_dev     | public       | yyy        | DELETE         | YES          | NO

 migration | migration  | jorge_dev     | public       | yyy        | TRUNCATE       | YES          | NO

 migration | migration  | jorge_dev     | public       | yyy        | REFERENCES     | YES          | NO

 migration | migration  | jorge_dev     | public       | yyy        | TRIGGER        | YES          | NO

(12 rows)

jorge_dev=#

If I create table 'xxx' as a different user, then alter the table owner the grantor and grantee information is not carried over.

For example, this is a table created under a different user than altered to owner migration

jorge_dev=# select * from information_schema.table_privileges where table_name = 'xxx';

  grantor  |  grantee  | table_catalog | table_schema | table_name | privilege_type | is_grantable | with_hierarchy

-----------+-----------+---------------+--------------+------------+----------------+--------------+----------------

 migration | migration | jorge_dev     | public       | xxx        | INSERT         | YES          | NO

 migration | migration | jorge_dev     | public       | xxx        | SELECT         | YES          | YES

 migration | migration | jorge_dev     | public       | xxx        | UPDATE         | YES          | NO

 migration | migration | jorge_dev     | public       | xxx        | DELETE         | YES          | NO

 migration | migration | jorge_dev     | public       | xxx        | TRUNCATE       | YES          | NO

 migration | migration | jorge_dev     | public       | xxx        | REFERENCES     | YES          | NO

 migration | migration | jorge_dev     | public       | xxx        | TRIGGER        | YES          | NO

(7 rows)

How can we get all the privileges and grants inherited when a table owner is altered ?

-- 

Thanks,

Jorge Torralba
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