UUID columns contains all zeros in DuckDB table.

mariadb > CREATE TABLE invoice ( 

            id UUID DEFAULT(uuid()) PRIMARY KEY, 

            product VARCHAR(64), 

            amount DECIMAL(12,2), 

            sold_at TIMESTAMP ) ENGINE=DuckDB DEFAULT CHARSET utf8mb4;

Query OK, 0 rows affected (0.016 sec)

mariadb > INSERT INTO invoice (product, amount, sold_at) 

          VALUES ('MariaDB mug', 12.00, NOW()), 

                 ('DuckDB sticker', 2.50, NOW()), 

                 ('Sea lion plush', 25.00, NOW()), 

                 ('DuckDB sticker', 2.50, NOW());

Query OK, 4 rows affected (0.009 sec)

Records: 4  Duplicates: 0  Warnings: 0

mariadb > SELECT id, product, amount FROM invoice;

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

| id                                   | product        | amount |

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

| 00000000-0000-0000-0000-000000000000 | MariaDB mug    |  12.00 |

| 00000000-0000-0000-0000-000000000000 | DuckDB sticker |   2.50 |

| 00000000-0000-0000-0000-000000000000 | Sea lion plush |  25.00 |

| 00000000-0000-0000-0000-000000000000 | DuckDB sticker |   2.50 |

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

4 rows in set (0.003 sec)