public inbox for [email protected]
help / color / mirror / Atom feedFrom: Paul Jungwirth <[email protected]>
To: PostgreSQL Hackers <[email protected]>
Subject: format_datum debugging function
Date: Fri, 9 Aug 2024 16:04:45 -0700
Message-ID: <[email protected]> (raw)
Hi Hackers,
Often in a debugger I've wanted to way to print Datums, in particular non-trivial ones like range
types. This came up a lot when I was working on multiranges, and I've wished for it lately while
working on UPDATE/DELETE FOR PORTION OF. But all the obvious approaches are inlined functions or
preprocessor macros, so they aren't available. Usually I wind up giving up on gdb and adding elog
statements. Once or twice I've copy/pasted from the three or four levels of nested macros to make
gdb do what I wanted, but it's a pain.
I assumed printing a Datum was easy, and I was the only one who didn't know how to do it. But
perhaps not. The conversation about print.c [1] made me think I should propose a way to make it
easier. This function takes a Datum and the appropriate out function, and returns a char *. So you
can do this:
(gdb) call format_datum(range_out, $1)
$2 = 0x59162692d938 "[1,4)"
I assume a patch like this doesn't need documentation. Does it need a test? Anything else?
[1] https://www.postgresql.org/message-id/flat/7d023c20-6679-44bd-b5f7-44106659bd5a%40eisentraut.org
Yours,
--
Paul ~{:-)
[email protected]
view thread (2+ messages)
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: [email protected]
Cc: [email protected], [email protected]
Subject: Re: format_datum debugging function
In-Reply-To: <[email protected]>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox