I've been doing some poking at the full-text indexing code in
/contrib/fulltextindex to try to get it to work with non-ASCII locales
(among other things), but I'm having a bit of trouble trying to figure
out how to properly parse non-ASCII strings from inside the fti()
trigger function (which is written in C).
My problem is this:
I want to aggregate text in multiple languages in a single full-text index
much like the current structure used by the current fti() function. In order
to correctly parse the strings, however, I've got to know what locale
they're written in/for (otherwise, isalpha() thinks that characters such as
the Hungarian letter u" -- that's a 'u' with a double acute accent -- aren't
very alphabetic.)
My initial thinking (which could certainly be very wrong) is that the
easiest way to get around this would be to allow client apps to set their
LC_ALL environment variables, and then to have the new fti() function use
that locale while doing string manipulation.
But the way I'm doing things, it doesn't appear that the LC_ALL environment
variable is available. (Maybe it was never meant to be ... but I'm not a
very skilled C programmer, and I don't know the first thing about the SPI
interface, so please forgive me if I'm asking why the sun doesn't rise in
the west more often ;-)).
Here's what's happening:
bash# LC_ALL=hu_HUbash# export LC_ALLbash# psql testWelcome to psql, the PostgreSQL interactive terminal.
Type: \copyright for distribution terms \h for help with SQL commands \? for help on internal slash
commands \g or terminate with semicolon to execute query \q to quit
test=# INSERT INTO ttxt (t1) values ('FELELÕSSÉGÛ');INSERT 513377 1test=#select * from ttxt_fti; string | id
--------+--------felel | 513377 ss | 513377(2 rows)
Which isn't quite what I'm looking for ;-).
Inside the C source of fti(), I added a call to getenv("LC_ALL") to make
sure that LC_ALL really isn't set:
locale = getenv("LC_ALL"); elog(NOTICE,"Locale is '%s'\n",locale);
And sure enough, it outputs:
NOTICE: Locale is '(null)'
If, on the other hand, I do:
setlocale("LC_ALL","hu_HU")
inside fti(), everything works out perfectly:
test=# INSERT INTO ttxt (t1) values ('FELELÕSSÉGÛ');INSERT 513410 1test=# select * from ttxt_fti; string | id
-------------+--------felelõsségû | 513410(1 row)
Any ideas?
Cheers,
Charlie
P.S. I only subscribe to the hackers digest, so please CC me with your
replies... Thanks!
