maria-developers team mailing list archive

[Peter Laursen <peter_laursen@xxxxxxxxxx>]

Refer http://kb.askmonty.org/v/virtual-columns - the example

CREATE TABLE table1 (
a INT NOT NULL,
b VARCHAR(32),
c INT AS (a MOD 10) virtual,
d VARCHAR(5) AS (LEFT(b,5)) persistent);


now

SHOW FULL FIELDS FROM table1;

Field Type Collation Null Key Default Extra Privileges Comment
------ ----------- ----------------- ------ ------ ------- -------
------------------------------- -------
a int(11) (NULL) NO (NULL) select,insert,update,references
b varchar(32) latin1_swedish_ci YES (NULL) select,insert,update,references
c int(11) (NULL) YES (NULL) VIRTUAL select,insert,update,references
d varchar(5) latin1_swedish_ci YES (NULL) VIRTUAL
select,insert,update,references

I request that 'extra' column should return either "PERSISTENT" or "
VIRTUAL, PERSISTENT" for column `d`.  The reason is that the output from
SHOW FULL FIELDS returns an *array* (that will not need to be parsed)  as
opposite to SHOW CREATE TABLE. Accordingly SHOW FULL FIELDS is much easier
to use for an 'unintelligent client' as opposed to an 'intelligent (or
ignorant for that sake :-) ) human user to decide on special properties for
a column.


Peter
Webyog