mysql show replica status error converting NULL to uint32 is unsupported

[trpalmer]

Previously referenced in #307 this is a problem even with later versions of MySql server that the MySql client does not have a problem with

usql --version
usql 0.19.26

show replica status;
error: mysql: sql: Scan error on column index 43, name "SQL_Remaining_Delay": converting NULL to uint32 is unsupported

select @@version;
+-----------+
| @@version |
+-----------+
| 8.0.42    |
+-----------+
(1 row)

Same db, mysql client:

mysql> show replica status\G;
*************************** 1. row ***************************
             Replica_IO_State: Queueing source event to the relay log
                  Source_Host: xx
                  Source_User: rdsrepladmin
                  Source_Port: 3306
                Connect_Retry: 60
              Source_Log_File: mysql-bin-changelog.2070680
          Read_Source_Log_Pos: 88884063
               Relay_Log_File: relaylog.337483
                Relay_Log_Pos: 279
        Relay_Source_Log_File: mysql-bin-changelog.2070673
           Replica_IO_Running: Yes
          Replica_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table: mysql.%
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Source_Log_Pos: 28800067
              Relay_Log_Space: 999967256
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Source_SSL_Allowed: Yes
           Source_SSL_CA_File:
           Source_SSL_CA_Path:
              Source_SSL_Cert:
            Source_SSL_Cipher:
               Source_SSL_Key:
        Seconds_Behind_Source: 392688
Source_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Source_Server_Id: 601416912
                  Source_UUID: 7ca7a424-9253-3e40-a7d8-fdef41c9ccc5
             Source_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
    Replica_SQL_Running_State: Waiting for dependent transaction to commit
           Source_Retry_Count: 86400
                  Source_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Source_SSL_Crl:
           Source_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Source_TLS_Version:
       Source_public_key_path:
        Get_Source_public_key: 0
            Network_Namespace:
1 row in set (0.05 sec)

[kenshaw]

I don't have any MySQL replicated databases readily available to test this against. I'll look into seeing what the cause is here, however.