"zhuge xiao" <zhuge@Rinaix.cn> writes:
> I wrote and compiled and linked a C function, add_float, which returns
> float in C like following:
>
> PG_FUNCTION_INFO_V1(add_float);
>
> Datum
> add_float(PG_FUNCTION_ARGS)
> {
> float arg = PG_GETARG_FLOAT8(0);
>
> PG_RETURN_FLOAT8(arg + 10);
> }
>
> After having loaded it into database, executed the SQL command, "select
> ad_float(2.90)", but one error occured. The error message is "Error:
> invalid memory alloc request size 4294967290" .
float8 and float aren't the same thing. "float" is a C data type which is not
wide enough to hold a float8. The first line actually works by shortening it
but the return doesn't work because it returns a pointer to the float and
claims it's a pointer to the float8.
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
