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Before performing checks on an index, we need to take some safety measures that apply to all index AMs. This includes: * verifying that the index can be checked - Only selected AMs are supported by amcheck (right now only B-Tree). The index has to be valid and not a temporary index from another session. * changing (and then restoring) user's security context * obtaining proper locks on the index (and table, if needed) * discarding GUC changes from the index functions Until now this was implemented in the B-Tree amcheck module, but it's something every AM will have to do. So relocate the code into a new module verify_common for reuse. The shared steps are implemented by amcheck_lock_relation_and_check(), receiving the AM-specific verification as a callback. Custom parameters may be supplied using a pointer. Author: Andrey Borodin <amborodin@acm.org> Reviewed-By: José Villanova <jose.arthur@gmail.com> Reviewed-By: Aleksander Alekseev <aleksander@timescale.com> Reviewed-By: Nikolay Samokhvalov <samokhvalov@gmail.com> Reviewed-By: Andres Freund <andres@anarazel.de> Reviewed-By: Tomas Vondra <tomas@vondra.me> Reviewed-By: Mark Dilger <mark.dilger@enterprisedb.com> Reviewed-By: Peter Geoghegan <pg@bowt.ie> Reviewed-By: Kirill Reshke <reshkekirill@gmail.com> Discussion: https://postgr.es/m/45AC9B0A-2B45-40EE-B08F-BDCF5739D1E1%40yandex-team.ru
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.