Re: Cache lookup errors with functions manipulation object addresses

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: Cache lookup errors with functions manipulation object addresses
Date: 2018-12-25 04:34:38
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Álvaro, all,

On Fri, Dec 14, 2018 at 09:04:36AM +0900, Michael Paquier wrote:
> Thanks again for looking up at what was proposed. I'll see if I can
> finish the refactoring part for the next CF, and be done with this
> stuff.

Please find attached an updated patch set which reworks the SQL
interface for object addresses so as NULL-ness is handled consistently
for all object types. This has needed a couple of extensions to some
current object-lookup APIs, which are added as refactoring bits
without breaking existing callers:
- Procedures and operators gain a new _extended routine which can take
a set of flags to enforce a NULL result or force qualification.
- format_type_extended needs an extra flag to enforce NULL.

On top of the refactoring issues, here is the list of changes to make
things work:
- The object type can never be NULL, meaning that for undefined
relations, routines or constraints the caller gets a generic name even
if the object is not defined. (That's the definition mentioned a
couple of messages upthread).
- Large object existence is checked with LargeObjectExists().
- Table columns show all the fields as NULL if the object identity
cannot be found instead of showing the table and its schema.

With that all the regression tests show a consistent behavior for all
object types when those are undefined. Thoughts?

Attachment Content-Type Size
0001-Add-flag-to-format_type_extended-to-enforce-NULL-nes.patch text/x-diff 3.4 KB
0002-Refactor-format-procedure-and-operator-APIs-to-be-mo.patch text/x-diff 7.0 KB
0003-Eliminate-user-visible-cache-lookup-errors-for-objad.patch text/x-diff 118.0 KB

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