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The dmetaphone() SQL function internally upper-cases the argument string. It did this using the toupper() function. That way, it has a dependency on the global LC_CTYPE locale setting, which we want to get rid of. The "double metaphone" algorithm specifically supports the "C with cedilla" letter, so just using ASCII case conversion wouldn't work. To fix that, use the passed-in collation and use the str_toupper() function, which has full awareness of collations and collation providers. Note that this does not change the fact that this function only works correctly with single-byte encodings. The change to str_toupper() makes the case conversion multibyte-enabled, but the rest of the function is still not ready. Reviewed-by: Jeff Davis <pgsql@j-davis.com> Discussion: https://www.postgresql.org/message-id/108e07a2-0632-4f00-984d-fe0e0d0ec726%40eisentraut.org
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.