Re: Typo in misc_sanity.sql?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Japin Li <japinli(at)hotmail(dot)com>
Cc: "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Typo in misc_sanity.sql?
Date: 2022-07-25 11:39:00
Message-ID: 1910734.1658749140@sss.pgh.pa.us
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Japin Li <japinli(at)hotmail(dot)com> writes:
> I found the misc_sanity has a SQL to check system catalogs that
> do not have primary keys, however, in current exceptions it says
> pg_depend, pg_shdepend don't have a unique key.

As indeed they do not:

regression=# \d pg_depend
Table "pg_catalog.pg_depend"
Column | Type | Collation | Nullable | Default
-------------+---------+-----------+----------+---------
classid | oid | | not null |
objid | oid | | not null |
objsubid | integer | | not null |
refclassid | oid | | not null |
refobjid | oid | | not null |
refobjsubid | integer | | not null |
deptype | "char" | | not null |
Indexes:
"pg_depend_depender_index" btree (classid, objid, objsubid)
"pg_depend_reference_index" btree (refclassid, refobjid, refobjsubid)

regression=# \d pg_shdepend
Table "pg_catalog.pg_shdepend"
Column | Type | Collation | Nullable | Default
------------+---------+-----------+----------+---------
dbid | oid | | not null |
classid | oid | | not null |
objid | oid | | not null |
objsubid | integer | | not null |
refclassid | oid | | not null |
refobjid | oid | | not null |
deptype | "char" | | not null |
Indexes:
"pg_shdepend_depender_index" btree (dbid, classid, objid, objsubid), tablespace "pg_global"
"pg_shdepend_reference_index" btree (refclassid, refobjid), tablespace "pg_global"
Tablespace: "pg_global"

Your proposed wording seems to give strictly less information,
so I do not see why it's an improvement.

regards, tom lane

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