Clickhouse has special options "do_not_merge_across_partitions_select_final" for ReplaceMergeTree Engine, which allows make fast select on the "optimized" partitions. Unfortunate you have to run manually (crontab)  "OPTIMIZE TABLE ... PARTITION ... FINAL" . 

It will be great to have some options which will tell Clickhouse to compact older partitions on some conditions:

i.e.
```
CREATE TABLE select_final (t DateTime, x Int32, string String) ENGINE = ReplacingMergeTree() PARTITION BY toYYYYMMDD(t) ORDER BY (x, t)  SETTINGS optimize_partition_after = 3600
```
Clickhouse will check if a partition is older than 3600 seconds and has multiple parts and in such condition will do automatically optimization (compaction) 

P.S. we just discussed with @alexey-milovidov about this options :-) 




FutureMergedMutatedPartPtr future_part,
    StorageMetadataPtr metadata_snapshot,
    MutationCommandsConstPtr commands,
    MergeListEntry * merge_entry,
    time_t time_of_mutation,
    ContextPtr context,
    const MergeTreeTransactionPtr & txn,
    ReservationSharedPtr space_reservation,
    TableLockHolder & holder)
{
    return std::make_shared<MutateTask>(
        future_part,
        metadata_snapshot,
        commands,
        merge_entry,
        time_of_mutation,
        context,
        space_reservation,
        holder,
        txn,
        data,
        *this,
        merges_blocker
    );
}
MergeTreeData::DataPartPtr MergeTreeDataMergerMutator::renameMergedTemporaryPart(