[gempir]

It even supported running as a MySQL Replica at some point.

"MaterializedMySQL"

Sadly that feature seems to have been thrown out, probably due to complexity.

https://github.com/ClickHouse/ClickHouse/discussions/44887#d...

https://www.percona.com/blog/complete-walkthrough-mysql-to-c...

https://github.com/ClickHouse/ClickHouse/pull/73879

[tempest_]

Mostly due to support, at least on the PG side.

They bought peerdb and offer it as clickhouse pipes so I suspect the incentive to support that feature is pretty low