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pg_prewarm() currently checks for SELECT privileges on the target relation. However, indexes do not have access rights of their own, so a role may be denied permission to prewarm an index despite having the SELECT privilege on its parent table. This commit fixes this by locking the parent table before the index (to avoid deadlocks) and checking for SELECT on the parent table. Note that the code is largely borrowed from amcheck_lock_relation_and_check(). An obvious downside of this change is the extra AccessShareLock on the parent table during prewarming, but that isn't expected to cause too much trouble in practice. Author: Ayush Vatsa <ayushvatsa1810@gmail.com> Co-authored-by: Nathan Bossart <nathandbossart@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Jeff Davis <pgsql@j-davis.com> Discussion: https://postgr.es/m/CACX%2BKaMz2ZoOojh0nQ6QNBYx8Ak1Dkoko%3DD4FSb80BYW%2Bo8CHQ%40mail.gmail.com Backpatch-through: 13
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.