Re: BUG #17909: CREATE SCHEMA AUTHORIZATION sch CREATE TABLE foo ( id INT ) will coredump

On Fri, Apr 28, 2023 at 08:56:27AM +0900, Michael Paquier wrote:
> Actually, wait a min..  The transformation of the objects is applied
> during the execution of the CREATE SCHEMA command, but nowhere else,
> so if you give to transformCreateSchemaStmt() the name of the expected
> schema rather than rely on the schema name from the query this should
> work OK.

So, the source of my confusion is the design currently used for
transformCreateSchemaStmt():
- The schema name is extracted from the query itself, but we have a
schema compiled from a role specification, depending on how the
beginning of CreateSchemaCommand() feels it.
- This routine includes a reference to the role specification in the
context, but makes no use of it.  Perhaps somebody would be
interested in this information in the future if the query support is
improved, but one could also be tempted to feed the schema name based
on the RoleSpec, which I'd rather avoid for the moment.

Attached is what I am finishing with, where I have reworked
transformCreateSchemaStmt() so as it uses in input the list of
elements from CREATE SCHEMA and the schema name computed depending on
the security context, documenting requirements on the way (note the
extra unconstify for the RangeVars' schemas).  I have added a couple
of regression tests for all the object types that have schema
qualication checks, mixed with role specs and schema names.

Thoughts, comments or objections?
--
Michael