RAND() not reevaluated inside a SUBSELECT with MySQL-4.1

Hi,

RAND() value is not reevaluated inside a SUBSELECT when result returns more
than 1 row :

How-to-repeat :

mysql> CREATE TABLE r (a int(1));
Query OK, 0 rows affected (0.05 sec)

mysql> INSERT INTO r VALUES (1),(2),(3);
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> SELECT RAND(),(SELECT RAND()) FROM r;
+------------------+------------------+
| RAND() | (SELECT RAND()) |
+------------------+------------------+
| 0.94738782937395 | 0.92367791936144 |
| 0.22180646119808 | 0.92367791936144 |
| 0.77874142749118 | 0.92367791936144 |
+------------------+------------------+
3 rows in set (0.00 sec)

mysql> SELECT *,RAND() FROM (SELECT RAND()) as a,r;
+------------------+------+------------------+
| RAND() | a | RAND() |
+------------------+------+------------------+
| 0.22828778459531 | 1 | 0.80521467123666 |
| 0.22828778459531 | 2 | 0.34121003313103 |
| 0.22828778459531 | 3 | 0.29040618267879 |
+------------------+------+------------------+
3 rows in set (0.00 sec)

Regards,
Jocelyn


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Re: RAND() not reevaluated inside a SUBSELECT with MySQL-4.1

Hi!

On Thu, Dec 19, 2002 at 03:21:48PM -0000, Jocelyn Fournier wrote:
> Hi,
>
> RAND() value is not reevaluated inside a SUBSELECT when result returns more
> than 1 row :
>
> How-to-repeat :
>
> mysql> CREATE TABLE r (a int(1));
> Query OK, 0 rows affected (0.05 sec)
>
> mysql> INSERT INTO r VALUES (1),(2),(3);
> Query OK, 3 rows affected (0.01 sec)
> Records: 3 Duplicates: 0 Warnings: 0
>
> mysql> SELECT RAND(),(SELECT RAND()) FROM r;
> +------------------+------------------+
> | RAND() | (SELECT RAND()) |
> +------------------+------------------+
> | 0.94738782937395 | 0.92367791936144 |
> | 0.22180646119808 | 0.92367791936144 |
> | 0.77874142749118 | 0.92367791936144 |
> +------------------+------------------+
> 3 rows in set (0.00 sec)
>
> mysql> SELECT *,RAND() FROM (SELECT RAND()) as a,r;
> +------------------+------+------------------+
> | RAND() | a | RAND() |
> +------------------+------+------------------+
> | 0.22828778459531 | 1 | 0.80521467123666 |
> | 0.22828778459531 | 2 | 0.34121003313103 |
> | 0.22828778459531 | 3 | 0.29040618267879 |
> +------------------+------+------------------+
> 3 rows in set (0.00 sec)
>
> Regards,
> Jocelyn

Thank you for you bugreport. I fixed this bug (patch is committed).


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