[MDEV-11540] Unexpected system threads in the process list - Jira

On bb-10.2-vcols, starting from 9a4d2284f8019bb84e68bc81e071df9c176dc607:

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

| Id | User        | Host            | db   | Command | Time | State            | Info             | Progress |

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

|  1 | system user | connecting host | NULL | Daemon  | NULL | Reading from net | NULL             |    0.000 |

|  5 | system user | connecting host | NULL | Daemon  | NULL | Reading from net | NULL             |    0.000 |

|  2 | system user | connecting host | NULL | Daemon  | NULL | Reading from net | NULL             |    0.000 |

|  4 | system user | connecting host | NULL | Daemon  | NULL | Reading from net | NULL             |    0.000 |

|  3 | system user | connecting host | NULL | Daemon  | NULL | Reading from net | NULL             |    0.000 |

|  8 | root        | localhost:43643 | NULL | Query   |    0 | init             | show processlist |    0.000 |

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

relates to

MDEV-5800 indexes on virtual (not materialized) columns

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