Description:
------------
Note: DB2 is version 8 FP10.

Calling a column function like COUNT() using 'ibm_db2' fails if there are NULLs in the column.  See the repro code below.

It works fine with ODBC.

This is a simplified repro scenario from a large application I'm porting.  In that application, db2_stmt_error() and db2_stmt_errormsg() return more info, but for some reason they don't seem to be working in my simple script.

Reproduce code:
---------------
DDL:

create table mytable (col1 int);
insert into mytable values (1);
insert into mytable values (2);
insert into mytable values (NULL);
insert into mytable values (4);

PHP app:

$statement = "SELECT count(col1) FROM mytable";
$result = db2_exec($dbconn, $statement);
if (db2_stmt_error())
{
  printf("%s\n", db2_stmt_errormsg());
}
while ($row = db2_fetch_array($result))
{
  printf ("\"%s\"\n", $row[0]);
}


Expected result:
----------------
"3"

Actual result:
--------------
PHP Warning:  db2_fetch_array(): Fetch Failure in C:\MyServer\testDb2Api.php on line 85

Warning: db2_fetch_array(): Fetch Failure in C:\MyServer\testDb2Api.php on line 85

In my large app, db2_stmt_errormsg() returns:

[IBM][CLI Driver][DB2/NT] SQLSTATE 01003: Null values were eliminated from the argument of a column function.