On Mon, 2009-10-05 at 16:27 +0900, KaiGai Kohei wrote:
> CREATE TABLE tbl_p (int a, int b);
> CREATE TABLE tbl_c (int x) INHERITS(tbl_p);
>
> SELECT a,b FROM tbl_p; --> It selects data from only tbl_p.
> It is reasonable to bypass checks on tbl_c.
> SELECT b,x FROM tbl_c; --> It selects data from tbl_p and tbl_c concurrently,
> if we consider the inherited columns are a part of
> the parent table.
I think you need to distinguish between the definition of columns and
the data in the columns. tbl_c has inherited the definition of the
columns from tbl_p, but the data is part of tbl_c, not tbl_p. So there
is not reason for this second query to ask tbl_p for permission, because
it does not touch data in tbl_p at all.
