>No query planner whatsoever. In databases like XTDB, the order of :where clauses doesn't matter since the engine is able to optimize them. In Datomic, swapping

>No query planner whatsoever. In databases like XTDB, the order of :where clauses doesn't matter since the engine is able to optimize them. In Datomic, swapping two :where clauses can transform a 10ms query into a 10s query. Datomic has query-stats https://docs.datomic.com/reference/query-stats.html https://docs.datomic.com/reference/query-stats.html