<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Thanks for the explanation. Maybe I could create a function on the database just to send something sufficiently appeasing to QGIS.</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Buona Pasqua!</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">c</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Apr 1, 2026 at 1:52 PM Régis Haubourg <<a href="mailto:regis.haubourg@gmail.com">regis.haubourg@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Hi, </p>
<p>This is pretty simple, </p>
<p>QGIS queries a bunch of things against the catalog system table
to understand the capabilities of the server, tables, access
privileges and so on. This query fails because pg_is_in_recovery()
function does not exist in postgres 8.4. on QGIS side, it hasn't
changed since 2 years:
<a href="https://github.com/qgis/QGIS/commit/d3474e4e2f258676c75bba874485b816b262acc2" target="_blank">https://github.com/qgis/QGIS/commit/d3474e4e2f258676c75bba874485b816b262acc2</a> </p>
<p>This has nothing to do with the URI. </p>
<p>GDAL does not need as many system queries because it is not a GUI
tool, so there is less chances it breaks. </p>
<p>This has changed between 3.34 and 3.40, to fix a crash
<a href="https://github.com/qgis/QGIS/pull/57810" target="_blank">https://github.com/qgis/QGIS/pull/57810</a> </p>
<p>So, it is probable we don't add a If statement to handle PG 8.4.
This function landed in 9.0 in postgres.</p>
<p><br>
</p>
<pre cols="72">Cheers
Régis Haubourg</pre>
<div>On 31/03/2026 22:00, Carlo A. Bertelli
(Charta s.r.l.) wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Thanks to
everyone for replying so quickly to this problem.</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">I totally
agree with you about the necessity to upgrade PostgreSQL and I
think it's not a good idea to risk adding bugs to a foundation
library as GDAL.</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Anyway, I
tried version 3.12.3 and it supports reading from a table and
writing to it without problems. But something changed at least
on version 4.0.0 for MacOS.</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">While the
DBManager recognized the table structure, the datasource
browser doesn't and complains:</div>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">Error retrieving fields information for
uri: bname='mydb' host=<span class="gmail_default" style="font-family:arial,sans-serif;font-size:small"></span>d<span class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><a href="http://b.myclientshost.com" target="_blank">b.myclientshost.com</a></span> port=5432
user='mypooruser' sslmode=disable checkPrimaryKeyUnicity='O'
table="oneschema". "mypolytable"</blockquote>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">when
browsing fields.</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Maybe it
has something to do with <span style="font-family:Arial,Helvetica,sans-serif"><b>uri: </b>bname which
obviously means </span><span style="font-family:Arial,Helvetica,sans-serif"><b>uri:
dbname</b> but the typo would break something if it is
used in the code.</span></div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><span style="font-family:Arial,Helvetica,sans-serif">This is the
PostGIS error I get when retrieving this layer:</span></div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><span style="font-family:Arial,Helvetica,sans-serif"><br>
</span></div>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">2026-03-31T21:39:29 WARNING
Erroneous query: SELECT has_table_privilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_recovery(),current_schema()
,has_any_column_privilege('"oneschema".
"mypolytable"','INSERT'),has_table_privilege('"oneschema".
"mypolytable"','DELETE'),has_any_column_privilege('"oneschema".
"mypolytable"','UPDATE'),'f' returned 7 [ERROR: function
pg_is_in_recovery() does not exist<br>
LINE 1: ...vilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_r...<br>
^<br>
HINT: No function matches the given name and
argument types. You might need to add explicit type casts.<br>
]<br>
2026-03-31T21:39:29 WARNING Unable to determine table
access privileges for the "oneschema". "mypolytable" relation.<br>
The error message from the database was:<br>
ERROR: function pg_is_in_recovery() does not
exist<br>
LINE 1: ...vilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_r...<br>
^<br>
HINT: No function matches the given name and
argument types. You might need to add explicit type casts.<br>
.<br>
SQL: SELECT has_table_privilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_recovery(),current_schema()
,has_any_column_privilege('"oneschema".
"mypolytable"','INSERT'),has_table_privilege('"oneschema".
"mypolytable"','DELETE'),has_any_column_privilege('"oneschema".
"mypolytable"','UPDATE'),'f'<br>
2026-03-31T21:39:29 WARNING Erroneous query: SELECT
has_table_privilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_recovery(),current_schema()
,has_any_column_privilege('"oneschema".
"mypolytable"','INSERT'),has_table_privilege('"oneschema".
"mypolytable"','DELETE'),has_any_column_privilege('"oneschema".
"mypolytable"','UPDATE'),'f' returned 7 [ERROR: function
pg_is_in_recovery() does not exist<br>
LINE 1: ...vilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_r...<br>
^<br>
HINT: No function matches the given name and
argument types. You might need to add explicit type casts.<br>
]<br>
2026-03-31T21:39:29 WARNING Unable to determine table
access privileges for the "oneschema". "mypolytable" relation.<br>
The error message from the database was:<br>
ERROR: function pg_is_in_recovery() does not
exist<br>
LINE 1: ...vilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_r...<br>
^<br>
HINT: No function matches the given name and
argument types. You might need to add explicit type casts.<br>
.<br>
SQL: SELECT has_table_privilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_recovery(),current_schema()
,has_any_column_privilege('"oneschema".
"mypolytable"','INSERT'),has_table_privilege('"oneschema".
"mypolytable"','DELETE'),has_any_column_privilege('"oneschema".
"mypolytable"','UPDATE'),'f'<br>
2026-03-31T21:46:13 WARNING Erroneous query: SELECT
has_table_privilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_recovery(),current_schema()
,has_any_column_privilege('"oneschema".
"mypolytable"','INSERT'),has_table_privilege('"oneschema".
"mypolytable"','DELETE'),has_any_column_privilege('"oneschema".
"mypolytable"','UPDATE'),has_column_privilege('"oneschema".
"mypolytable"','GEOMETRY','UPDATE') returned 7 [ERROR:
function pg_is_in_recovery() does not exist<br>
LINE 1: ...vilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_r...<br>
^<br>
HINT: No function matches the given name and
argument types. You might need to add explicit type casts.<br>
]<br>
2026-03-31T21:46:13 WARNING Unable to determine table
access privileges for the "oneschema". "mypolytable" relation.<br>
The error message from the database was:<br>
ERROR: function pg_is_in_recovery() does not
exist<br>
LINE 1: ...vilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_r...<br>
^<br>
HINT: No function matches the given name and
argument types. You might need to add explicit type casts.<br>
.<br>
SQL: SELECT has_table_privilege('"oneschema".
"mypolytable"','SELECT'),pg_is_in_recovery(),current_schema()
,has_any_column_privilege('"oneschema".
"mypolytable"','INSERT'),has_table_privilege('"oneschema".
"mypolytable"','DELETE'),has_any_column_privilege('"oneschema".
"mypolytable"','UPDATE'),has_column_privilege('"oneschema".
"mypolytable"','GEOMETRY','UPDATE')</blockquote>
<div><br>
</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">while
getting the same data by gdalinfo does not need any special
privilege. I should be able to understand what this repeated
error means on the SQL side, but it seems a complete nonsense
to me. I'm sure someone would detect the reason for it. </div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Is there
a way to mitigate it? I was trying to use a virtual ogr file
to handle misbehaving columns; I could convert some specific
table to Spatialite, but I think solving my problem could be
useful to someone else.</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Thanks in
advance for any hint provided.</div>
<div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">c</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Mar 31, 2026 at
8:26 PM Régis Haubourg via QGIS-Developer <<a href="mailto:qgis-developer@lists.osgeo.org" target="_blank">qgis-developer@lists.osgeo.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">9.1
has reached end of life 10 years ago!<br>
I'm with Even here. A Postgres server out of maintenance
period must be <br>
considered insecure and outdated and must totally be upgraded
anyway.<br>
<br>
Cheer, Régis<br>
<br>
On 31/03/2026 18:14, Stefanos Natsis via QGIS-Developer wrote:<br>
> One breaking change I'm aware of in QGIS 4 is that we've
used the <br>
> `CREATE TABLE IF NOT EXISTS` idiom for the
`qgis_projects` table (for <br>
> storing projects in the database) which was introduced in
PostgreSQL 9.1<br>
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</blockquote>
</div>
</blockquote>
</div>
</blockquote></div>