Hello,
I have a problem with enumerated types in functions parameters.
my enumerated type is (this is a subset)
CREATE TYPE hibridation AS ENUM('none','genus','specie');
function declaration
CREATE FUNCTION ename(text,boolean,text,text RETURNS text AS
'funzioniGDB.so' LANGUAGE C IMMUTABLE;
index creation (the type of ibrido is hibridation)
CREATE INDEX i_specie_nome_specie ON specie
(esterna_nome(ibrido::text,proParte,genere,specie));
the result is
ERROR: functions in index expression must be marked IMMUTABLE
Searching on google I found some explanation: the problem arises with
"non immutable" typea as "data" but I can't figure the problem (or
better, the solution) with enumerate types.
What can I do?
thank you
Edoardo
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