Re: Logging query parmeters in auto_explain

Michael Paquier <michael(at)paquier(dot)xyz> writes:

> On Tue, May 31, 2022 at 09:33:20PM +0100, Dagfinn Ilmari Mannsåker wrote:
>> Here's a patch that adds a corresponding
>> auto_explain.log_parameter_max_length config setting, which controls the
>> "Query Parameters" node in the logged plan. Just like in core, the
>> default is -1, which logs the parameters in full, and 0 disables
>> parameter logging, while any other value truncates each parameter to
>> that many bytes.
>
> With a behavior similar to the in-core log_parameter_max_length, this
> looks rather sane to me. This is consistent with the assumptions of
> errdetail_params().

That was the intention, yes.

> +$node->append_conf('postgresql.conf', "auto_explain.log_parameter_max_length = -1");
> Nit. You don't need this change in the TAP test, as this is the
> default value to log everything.

Point, fixed in the attached v2. I've also added a test that truncation
and disabling works.

- ilmari