core: SQL / MariaDB error on table

Home Assistant release with the issue: 0.86.4 (latest at the moment of issue) Last working Home Assistant release (if known): n/k Operating environment (Hass.io/Docker/Windows/etc.): Debian / venv / Python 3.6.8 Component/platform: mariadb / recorder

Description of problem: Error shows up unexpected (no issue with work of HA or no action done by users)

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant): n/a

Traceback (if applicable):

Error executing query SELECT table_schema "homeassistant", Round(Sum(data_length + index_length) / 1024 / 1024, 0) "value" FROM information_schema.tables WHERE table_schema="homeassistant" GROUP BY table_schema LIMIT 1;: (MySQLdb._exceptions.OperationalError) (2006, 'MySQL server has gone away') [SQL: 'SELECT table_schema "homeassistant", Round(Sum(data_length + index_length) / 1024 / 1024, 0) "value" FROM information_schema.tables WHERE table_schema="homeassistant" GROUP BY table_schema LIMIT 1;'] (Background on this error at: http://sqlalche.me/e/e3q8)

Additional information: Have it on a fresh system-install (was doing reinstallation) with latest Python 3.6.