[MDEV-35950] User variable changes every select - Jira

User defined variable containing result of `UUID()` returns different result on each select.

To reproduce run in mysql command line client:

set @b := UUID();

select @b;

select @b;

select @b;

Below are my results:

MariaDB [test]> set @b := UUID();

Query OK, 0 rows affected (0,032 sec)

MariaDB [test]> select @b;

+--------------------------------------+

| @b                                   |

+--------------------------------------+

| 5981fba1-dc91-11ef-91a2-ac1f6b47855a |

+--------------------------------------+

1 row in set (0,035 sec)

MariaDB [test]> select @b;

+--------------------------------------+

| @b                                   |

+--------------------------------------+

| 59829ca8-dc91-11ef-90e4-0cc47aa9252e |

+--------------------------------------+

1 row in set (0,042 sec)

MariaDB [test]> select @b;

+--------------------------------------+

| @b                                   |

+--------------------------------------+

| 5981fba1-dc91-11ef-91a2-ac1f6b47855a |

+--------------------------------------+

1 row in set (0,034 sec)

MariaDB [test]> select @b;

+--------------------------------------+

| @b                                   |

+--------------------------------------+

| 59829ca8-dc91-11ef-90e4-0cc47aa9252e |

+--------------------------------------+

1 row in set (0,041 sec)

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