mirror of
https://github.com/postgres/postgres.git
synced 2025-05-05 09:19:17 +03:00
53d3daa491
There is at least one report in the field of storing millions of integers in arrays, so it seems like a good time to specialize intarray's qsort function. In doing so, streamline the comparators: Previously there were three, two for each direction for sorting and one passed to qunique_arg. To preserve the early exit in the case of descending input, pass the direction as an argument to the comparator. This requires giving up duplicate detection, which previously allowed skipping the qunique_arg() call. Testing showed no regressions this way. In passing, get rid of nearby checks that the input has at least two elements, since preserving them would make some macros less readable. These are not necessary for correctness, and seem like premature optimizations. Author: Andrey M. Borodin <x4mmm@yandex-team.ru> Discussion: https://postgr.es/m/098A3E67-E4A6-4086-9C66-B1EAEB1DFE1C@yandex-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.