SQL & PL/SQL

Hi,

I've discovered some discrepancy between 10G and 11G in a way how view deals with NVL-based column in a where clause.
Here are two examples:

*10G:*

Connected to:
Oracle Database 10g Release 10.2.0.4.0 - Production

SQL> create table test_nvl (null_column number);

Table created.

SQL> insert into test_nvl values (null);

1 row created.

SQL> commit;

Commit complete.

SQL> create view view_nvl as select nvl(null_column,0) null_column from test_nvl;

View created.

SQL> select * from view_nvl where null_column is not null and null_column = 0;

NULL_COLUMN
- - - - - - - - - - -
0

*11G*

Connected to:
Oracle Database 11g Release 11.2.0.1.0 - 64bit Production

SQL> create table test_nvl (null_column number);

Table created.

SQL> insert into test_nvl values (null);

1 row created.

SQL> commit;

Commit complete.

SQL> create view view_nvl as select nvl(null_column,0) null_column from test_nvl;

View created.

SQL> select * from view_nvl where null_column is not null and null_column = 0;

no rows selected

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Does anyone know why it behaves differently?
I couldn't find any documentation regarding this.
Or I'm just missing something here.

Thanks