Incorrect value fetched while selecting NULL values

[shabbir10july]

Incorrect value fetched while selecting NULL values. Instead of NULL/None, 0.0 and 0 values are returned for float and int datatype.

Repro:

    def test_InsertNull(self):
        self.cursor.execute("CREATE TABLE t1 (c1 float4, c2 double, c3 int1, c4 int2, c5 int4, c6 int8, c7 char(5), c8 varchar(10),c9 nchar(50), c10 nvarchar(120),c11 varbinary(12), c12 ST_GEOMETRY(12), DATE_PROD DATE, TIME_PROD TIME, INTERVAL_PROD INTERVAL,TIMESTMP TIMESTAMP,TIMETZ_PROD TIME WITH TIME ZONE, c18 bool)")
        self.cursor.execute("INSERT INTO t1 VALUES(NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL))
        self.assertEqual(1, self.cursor.rowcount, "ERROR: Data Difference")
        self.cursor.execute("SELECT * FROM t1")
        results = self.cursor.fetchall()
        for c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13,c14,c15,c16,c17,c18 in results:
            print(c1)
            print(c2)
            print(c3)
            print(c4)
            print(c5)
            print(c6)
            print(c7)
            print(c8)
            print(c9)
            print(c10)
            print(c11)
            print(c12)
            print(c13)
            print(c14)
            print(c15)
            print(c16)
            print(c17)
            print(c18)