Comments - MariaDB Community Server and query result caching
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If you're talking about the Query Cache available in MariaDB Server 10.2, yes, it's available in MariaDB 10.3 as well. I think the feature on the sheet you link is referring to MaxScale. You can see the full list of changes between MariaDB 10.2 and 10.3 on Upgrading from MariaDB 10.2 to MariaDB 10.3.