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2b3d11aaed
This refactoring eases a little bit a follow-up change to add support for 8-byte TOAST value IDs, as the maximum chunk size allowed for a single chunk of TOASTed data depends on the size of varatt_external, its value ID being part of it. It is worth noting that TOAST_MAX_CHUNK_SIZE resolves as a uintptr_t, so the previous calculations were in 64-bit unsigned arithmetic. These are now done in int32, which still works the same way due to an external TOAST value being bounded to 1GB. Author: Michael Paquier <michael@paquier.xyz> Reviewed-by: Yugo Nagata <nagata@sraoss.co.jp> Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> Discussion: https://postgr.es/m/CALj2ACVnO6jjs5aRx3dSOBy9LV7=iakPBR1eOvoeB8rL8Q47zg@mail.gmail.com
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.