Postgres support (schemas)

[nene]

• [x] CREATE SCHEMA
  • [x] IF NOT EXISTS
  • [x] optional schema_name
  • [x] AUTHORIZATION role_specification:
    • [x] user_name
    • [x] CURRENT_ROLE | CURRENT_USER | SESSION_USER
  • [x] schema elements:
    • [x] CREATE TABLE
    • [x] CREATE VIEW
    • [x] CREATE INDEX
    • [x] CREATE SEQUENCE
    • [x] CREATE TRIGGER
    • [x] GRANT
• [x] DROP SCHEMA
  • [x] IF EXISTS
  • [x] multiple names
  • [x] CASCADE | RESTRICT
• [x] ALTER SCHEMA
  • [x] RENAME TO new_name
  • [x] OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
• [ ] IMPORT FOREIGN SCHEMA
  • [ ] remote_schema
  • [ ] { LIMIT TO | EXCEPT } ( table_name [, ...] )
  • [ ] FROM SERVER server_name
  • [ ] INTO local_schema
  • [ ] OPTIONS ( option 'value' [, ... ] )