Comments - Cannot find the constants for the Optimizer Cost Model in v11.5
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It seems you aren't running the MariaDB-11.0 version. Check with:
v11.5 looks like a client version as that server version hasn't even been developed yet let alone released.
Ah, yes, you're right.
I checked again, and the version is "10.5.18-MariaDB". So there was a typo before.