[BUGS] BUG #3630: Memory Allocation Error

The following bug has been logged online:

Bug reference:      3630
Logged by:          
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 8.1.9
Operating system:   Linux
Description:        Memory Allocation Error
Details: 

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" . 

However I changed the above function as following:

PG_FUNCTION_INFO_V1(add_integer);
Datum
add_integer(PG_FUNCTION_ARGS)
{
        int32   arg = PG_GETARG_INT32(0);

        PG_RETURN_INT32(arg + 10);
}

and executed the SQL command, "select add_integer(5)", and the result is:
add_integer
----------
        15

In another word, the function can NOT return float BUT return integer. Why?
Please help me.

Thank you very much.

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