BUG #16025: pg_default tablespace is removable but not creatable

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: kingsbury(dot)matthew(at)gmail(dot)com
Subject: BUG #16025: pg_default tablespace is removable but not creatable
Date: 2019-09-25 23:31:42
Message-ID: 16025-c86354bc1ad3e898@postgresql.org
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The following bug has been logged on the website:

Bug reference: 16025
Logged by: Matthew Kingsbury
Email address: kingsbury(dot)matthew(at)gmail(dot)com
PostgreSQL version: 11.5
Operating system: Ubuntu 18.04 LTS
Description:

I was able to rename pg_default to something else, accidentally. However,
there appears to be no mechanism to replace pg_default nor can one replace
the pg_default after performing this action. E.g. if one runs the command:

ALTER TABLESPACE pg_default
RENAME TO not_pg_default;

ALTER TABLESPACE not_pg_default
RENAME TO pg_default;

One encounters this error:
ERROR: unacceptable tablespace name "pg_default"
DETAIL: The prefix "pg_" is reserved for system tablespaces.

Leaving one without the pg_default tablespace.

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