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I tried with MariaDB C connector 2.3.3, 2.3.4 and 3.0.2. It returns the same error in all the cases.
MySQL Server version: MySQL 8.0.3-rc-log
mysql> show global variables like '%character_set%';
-------------------------
-------------------------
| character_set_client |
utf8mb4 |
| character_set_connection |
utf8mb4 |
| character_set_database |
utf8mb4 |
| character_set_filesystem |
binary |
| character_set_results |
utf8mb4 |
| character_set_server |
utf8mb4 |
| character_set_system |
utf8 |
| character_sets_dir |
/usr/share/mysql/charsets/ |
mysql> show global variables like 'collation%';
---------------------
---------------------
| collation_connection |
utf8mb4_0900_ai_ci |
| collation_database |
utf8mb4_0900_ai_ci |
| collation_server |
utf8mb4_0900_ai_ci |
Similar issue reported here with another collation.
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