Re: immutable functions and enumerate type casts in indexes

Tom Lane ha scritto:
> Edoardo Panfili <edoardo(at)aspix(dot)it> writes:
>> labelDatum = DirectFunctionCall1(enum_out,datumIbrido);
>> label = (char *) DatumGetPointer(labelDatum);
>
> Just FYI, preferred style for the second line would be
>
> label = DatumGetCString(labelDatum);
>
> Nearly all standard data types have DatumGetFoo and FooGetDatum
> macros to hide the conversion details (even if it's only a cast).

the clean version:
--------------------------------------------------------------
#include "utils/builtins.h"

PG_FUNCTION_INFO_V1(esterna_nome);
Datum esterna_nome(PG_FUNCTION_ARGS){
Datum datumIbrido = PG_GETARG_DATUM(0);
Datum labelDatum;
char *label;

labelDatum = DirectFunctionCall1(enum_out,datumIbrido);
label = DatumGetCString(labelDatum);
if(strcmp(label,("label_constant"))==0){
...
}
...
}
--------------------------------------------------------------

thank you again!
Edoardo