IN in_table VARCHAR(64),
        OUT out_exists ENUM('', 'BASE TABLE', 'VIEW', 'TEMPORARY', 'SEQUENCE', 'SYSTEM VIEW', 'TEMPORARY SEQUENCE')
    BEGIN
    DECLARE v_error BOOLEAN DEFAULT FALSE;
    DECLARE db_quoted VARCHAR(64);
    DECLARE table_quoted VARCHAR(64);
    DECLARE v_table_type VARCHAR(30) DEFAULT '';
    DECLARE CONTINUE HANDLER FOR 1050 SET v_error = TRUE;
    DECLARE CONTINUE HANDLER FOR 1146 SET v_error = TRUE;
    SET v_table_type = (SELECT GROUP_CONCAT(TABLE_TYPE) FROM information_schema.TABLES WHERE
                            TABLE_SCHEMA = in_db AND TABLE_NAME = in_table);
    IF v_table_type LIKE '%,%' THEN
        SET out_exists = 'TEMPORARY';
    ELSE
        IF v_table_type is NULL
        THEN
            SET v_table_type='';
        END IF;
        IF v_table_type = 'SYSTEM VERSIONED' THEN
            SET out_exists = 'BASE TABLE';
        ELSE
            SET out_exists = v_table_type;
        END IF;
    END IF;
END
             Description
             Tests whether the table specified in in_db and in_table exists either as a regular
             table, or as a temporary table. The returned value corresponds to the table that
             will be used, so if there's both a temporary and a permanent table with the given
             name, then 'TEMPORARY' will be returned.
             Parameters
             in_db (VARCHAR(64)):
               The database name to check for the existence of the table in.
             in_table (VARCHAR(64)):
               The name of the table to check the existence of.
             out_exists ENUM('', 'BASE TABLE', 'VIEW', 'TEMPORARY', 'SEQUENCE', 'SYSTEM VIEW', 'TEMPORARY SEQUENCE'):
               The return value: whether the table exists. The value is one of:
                 * ''                    - the table does not exist neither as a base table, view, sequence nor temporary table/sequence.
                 * 'BASE TABLE'          - the table name exists as a permanent base table table.
                 * 'VIEW'                - the table name exists as a view.
                 * 'TEMPORARY'           - the table name exists as a temporary table.
                 * 'SEQUENCE'            - the table name exists as a sequence.
                 * 'SYSTEM VIEW'         - the table name exists as a system view.
                 * 'TEMPORARY SEQUENCE'  - the table name exists as a temporary sequence.
             Example
             MariaDB [sys]> CREATE DATABASE db1;
             Query OK, 1 row affected (0.07 sec)
             MariaDB [sys]> use db1;
             Database changed
             MariaDB [sys]> CREATE TABLE t1 (id INT PRIMARY KEY);
             Query OK, 0 rows affected (0.08 sec)
             MariaDB [sys]> CREATE TABLE t2 (id INT PRIMARY KEY);
             Query OK, 0 rows affected (0.08 sec)
             MariaDB [sys]> CREATE view v_t1 AS SELECT * FROM t1;
             Query OK, 0 rows affected (0.00 sec)
             MariaDB [sys]> CREATE TEMPORARY TABLE t1 (id INT PRIMARY KEY);
             Query OK, 0 rows affected (0.00 sec)
             MariaDB [sys]> CREATE SEQUENCE s;
             Query OK, 0 rows affected (0.00 sec)
             MariaDB [sys]> CREATE TEMPORARY SEQUENCE s_temp;
             Query OK, 0 rows affected (0.00 sec)
             MariaDB [sys]> CALL sys.table_exists('db1', 't1', @exists); SELECT @exists;
             Query OK, 0 rows affected (0.00 sec)
             +------------+
             | @exists    |
             +------------+
             | TEMPORARY  |
             +------------+
             1 row in set (0.00 sec)
             MariaDB [sys]> CALL sys.table_exists('db1', 't2', @exists); SELECT @exists;
             Query OK, 0 rows affected (0.00 sec)
             +------------+
             | @exists    |
             +------------+
             | BASE TABLE |
             +------------+
             1 row in set (0.01 sec)
             MariaDB [sys]> CALL sys.table_exists('db1', 'v_t1', @exists); SELECT @exists;
             Query OK, 0 rows affected (0.00 sec)
             +---------+
             | @exi