[bug] Error installing ERPNext v12.10.1 on AWS RDS MariaDB

Description of the issue

I have enabled "rds_db": 1 in common_site_config.json:

(env) root@frappe-bench-0001-erpnext-worker-d-847966697-fwkwc:/home/frappe/frappe-bench/sites# cat common_site_config.json 
{
    "db_host": "xxx.ap-southeast-1.rds.amazonaws.com",
    "db_port": 3306,
    "rds_db": 1,
    "redis_cache": "redis://frappe-bench-0001-erpnext-redis-cache:13000",
    "redis_queue": "redis://frappe-bench-0001-erpnext-redis-queue:12000",
    "redis_socketio": "redis://frappe-bench-0001-erpnext-redis-socketio:11000",
    "socketio_port": 9000
}

Context information (for bug reports)

• Kubernetes 1.18
• frappe/erpnext-worker v12.10.1
• AWS RDS MariaDB 10.4.13

Steps to reproduce the issue

1. Create AWS RDS MariaDB database
2. Install ERPNext v12.10.1 on Kubernetes using helm chart
3. Error

Observed result

ERROR 1054 (42S22) at line 1: Unknown column 'ERROR (RDS): SUPER PRIVILEGE CANNOT BE GRANTED OR MAINTAINED' in 'field list'
ERROR 1396 (HY000) at line 1: Operation ALTER USER failed for '_9a6f28ddcbb1acb1'@'%'
ERROR 1044 (42000) at line 1: Access denied for user 'root'@'%' to database '_9a6f28ddcbb1acb1'

Expected result

Successful.

Stacktrace / full error message

$ kubectl create -n erpnext -f add-lovia-site-job.yaml 
...

$ kubectl logs -f -n erpnext create-erp-lovia-life-2knwd
Attempt 1 to connect to xxx.ap-southeast-1.rds.amazonaws.com:3306
Attempt 1 to connect to frappe-bench-0001-erpnext-redis-queue:12000
Attempt 1 to connect to frappe-bench-0001-erpnext-redis-cache:13000
Attempt 1 to connect to frappe-bench-0001-erpnext-redis-socketio:11000
Connections OK
Created user _9a6f28ddcbb1acb1
Created database _9a6f28ddcbb1acb1
Granted privileges to user _9a6f28ddcbb1acb1 and database _9a6f28ddcbb1acb1
Starting database import...
Imported from database /home/frappe/frappe-bench/apps/frappe/frappe/database/mariadb/framework_mariadb.sql

Installing frappe...
Updating DocTypes for frappe        : [========================================]
Updating country info               : [========================================]

Installing erpnext...
Updating DocTypes for erpnext       : [========================================]
Updating customizations for Address
*** Scheduler is disabled ***
ERROR 1054 (42S22) at line 1: Unknown column 'ERROR (RDS): SUPER PRIVILEGE CANNOT BE GRANTED OR MAINTAINED' in 'field list'
ERROR 1396 (HY000) at line 1: Operation ALTER USER failed for '_9a6f28ddcbb1acb1'@'%'
ERROR 1044 (42000) at line 1: Access denied for user 'root'@'%' to database '_9a6f28ddcbb1acb1'

Additional information

OS version / distribution, ERPNext install method, etc.

• Kubernetes
• Helm

[ceefour]

@revant If it helps, I made a pretty intensive writeup about the AWS RDS MariaDB issue (and workaround) here: https://about.lovia.life/docs/infrastructure/erpnext/#2_3_MariaDB_Installation_(and_AWS_RDS_MariaDB_Workaround)

[ceefour]

Thank you very much @revant 👍