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Commit 749a787c5b25ae33b3d4da0ef12aa05214aa73c7 bumped the extension version on all of these extensions already, and we haven't had a release since then, so we can make further changes without bumping the extension version again. Take this opportunity to mark all of the functions exported by these modules PARALLEL SAFE -- except for pg_trgm's set_limit(). Mark that one PARALLEL RESTRICTED, because it makes a persistent change to a GUC value. Note that some of the markings added by this commit don't have any effect; for example, gseg_picksplit() isn't likely to be mentioned explicitly in a query and therefore it's parallel-safety marking will never be consulted. But this commit just marks everything for consistency: if it were somehow used in a query, that would be fine as far as parallel query is concerned, since it does not consult any backend-private state, attempt to write data, etc. Andreas Karlsson, with a few revisions by me.
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.