CAST NULL AS NUMBER(9) problem

[amacchi]

We are using DbexpOda.dll Version 3.2.0.9
with those parameters:

EnableBCD = False
IntegerPrecision = 9
SmallIntPrecision = 0
FloatPrecision = 38

Every NUMBER(9) fields are correctly mapped as TIntegereField.
We want to map a View with NULL value for a column and map it as Integer Field.

CREATE VIEW MYVIEW (MyField1, MyField2) AS
SELECT
CAST(NULL AS NUMBER(9)) ,
CAST(0 AS NUMBER(9))
FROM
MYTABLE

MyField1 Will be wrong mapped as TFloatField.
MyField2 Will be correctly mapped as TIntegerField.

Why?

THX
Andrea

[Plash]

This is an Oracle bug. Precision for this field is not returned correctly.

[amacchi]

Could you please send me link of official oracle article/documentation about this bug, please?
THX