Re: pg_dumpall: pg_conversion table not saved

Tom Lane schrieb:
> Michael Enke <michael(dot)enke(at)wincor-nixdorf(dot)com> writes:
>> I updated pg_converion to set the condefault=false where I need it.
>
> Why are you needing to replace an existing default conversion?
> Do we have a bug in it?

No, not a bug. But I need CP852 encoding conversion. Maybe you can take a look at
http://archives.postgresql.org/pgsql-general/2008-05/msg00185.php
and give your comment.

Is the CREATE CONVERSION only for the case that there is a bug in existing default conversions? ;-)

>> pg_dumpall does NOT write that table out and therefore it is not possible to restore, this update get lost.
>
> pg_dump does not (and shouldn't) dump system-defined objects. It has
> no way to know that you modified the definition of such an object.
>
>> Why can not the "CREATE DEFAULT CONVERSION ..."
>> a) return with an error if there is another default conversion existing or
>
> AFAICS it does.

You can try with attached library:

CREATE FUNCTION utf82cp852(integer,integer,cstring,internal,integer)
RETURNS void AS '/tmp/libencodings' LANGUAGE 'C';
CREATE FUNCTION cp8522utf8(integer,integer,cstring,internal,integer)
RETURNS void AS '/tmp/libencodings' LANGUAGE 'C';

CREATE DEFAULT CONVERSION utf82cp852 FOR 'UNICODE' TO 'LATIN2' FROM utf82cp852;
CREATE DEFAULT CONVERSION cp8522utf8 FOR 'LATIN2' TO 'UNICODE' FROM cp8522utf8;

It doesn't complain but it also is not the encoding used now
since utf8_to_iso_8859_2 / iso_8859_2_utf8 has still condefault=true.
If I now set condefault to false, my conversion function is used.

Regards,
Michael

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