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Commit 75d22069e tried to throw a warning for setting a custom GUC whose prefix belongs to a previously-loaded extension, if there is no such GUC defined by the extension. But that caused unstable behavior with parallel workers, because workers don't necessarily load extensions and GUCs in the same order their leader did. To make that work safely, we have to completely disallow the case. We now actually remove any such GUCs at the time of initial extension load, and then throw an error not just a warning if you try to add one later. While this might create a compatibility issue for a few people, the improvement in error-detection capability seems worth it; it's hard to believe that there's any good use-case for choosing such GUC names. This also un-reverts 5609cc01c (Rename EmitWarningsOnPlaceholders() to MarkGUCPrefixReserved()), since that function's old name is now even more of a misnomer. Florin Irion and Tom Lane Discussion: https://postgr.es/m/1902182.1640711215@sss.pgh.pa.us
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.