Preventing a user to use implicit casts

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Hi,

Is there a way to define some implicit casts so that only one specific database
user can use them, and they're not visible to others?

I'm facing the case where to have same behaviour as in 8.2 for this
"Non-character data types are no longer automatically cast to TEXT" 8.3
improvements, I used implicit casts proposed here:

http://wiki.postgresql.org/images/d/d1/Pg83-implicit-casts.sql

Problem yet is I can't use slony any more to replicate data, as it falls in
error with this kind of messages:

Jul  1 17:23:20 jck20 slon[6671]: [62-1] 2009-07-01 17:23:20 CEST FATAL
cleanupThread: "select "_gvr".cleanupEvent('10 minutes'::interval,
'false'::boolean); " - ERROR:
Jul  1 17:23:20 jck20 slon[6671]: [62-2]   operator is not unique: unknown ||
integer
Jul  1 17:23:20 jck20 slon[6671]: [62-3] LINE 1: SELECT  'PartInd_gvr_sl_log_'
||  $1  || '-node-' ||  $2
Jul  1 17:23:20 jck20 slon[6671]: [62-4]                                       ^
Jul  1 17:23:20 jck20 slon[6671]: [62-5] HINT:  Could not choose a best
candidate operator. You might need to add explicit type casts.
Jul  1 17:23:20 jck20 slon[6671]: [62-6] QUERY:  SELECT  'PartInd_gvr_sl_log_'
||  $1  || '-node-' ||  $2
Jul  1 17:23:20 jck20 slon[6671]: [62-7] CONTEXT:  PL/pgSQL function
"addpartiallogindices" line 28 at assignment
Jul  1 17:23:20 jck20 slon[6671]: [62-8] SQL statement "SELECT
"_gvr".addPartialLogIndices()"
Jul  1 17:23:20 jck20 slon[6671]: [62-9] PL/pgSQL function "logswitch_finish"
line 99 at PERFORM

I'm quit disappointed, as if I let slony replicate the application, still in a
process of migration to 8.3 correct behaviour can't be used, on the other hand
if I add implicit casts to allow application to work, I can't replicate with slony.

Thanks in advance for any help.

Regards,
- --
Stéphane Schildknecht
PostgreSQLFr - http://www.postgresql.fr

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