Re: BUG #6517: Volatile function erroneously optimized, does not consider change in schema path

On 12 March 2012 16:16, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> Robert Haas <robertmhaas@gmail.com> writes:
> > On Mon, Mar 5, 2012 at 6:52 AM,  <rene.vanpaassen@gmail.com> wrote:
> >> I found some unexpected behaviour when changing the schema search path
> in
> >> combination with plpgsql functions (may be true for other function typ=
es
> >> too, did not check). This occurs both in 9.1.2 (on Fedora, 64 bit) and
> 8.4.9
> >> (Centos 6, 32 bit). I created a small example run with psql, to
> demonstrate
> >> this.
>
> > I have a vague feeling this is a known issue.  It sure seems like we
> > should handle it better, but I'm not sure how hard that would be to
> > implement.
>
> plpgsql intentionally caches the plan for the query as it was built with
> the original search_path.  There's been talk of adjusting that behavior
> but I'm worried that we might break as many cases as we fix ...
>

But since I can work around the problem by closing and opening the database
connection, the "original search_path" is thus the search path that the
function happened to run in for the first time with the current database
connection.

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