If they are defined, they can override table-level settings.
{
        const auto settings = getSettings();
        return settings->index_granularity_bytes != 0 &&
            (settings->enable_mixed_granularity_parts || !has_non_adaptive_index_granularity_parts);
    }
    
    
    
    MergeTreeSettingsPtr getSettings() const
    {
        return storage_settings.get();
    }
    String getRelativeDataPath() const { return relative_data_path; }
    
    String getFullPathOnDisk(const DiskPtr & disk) const;
    
    
    DiskPtr tryGetDiskForDetachedPart(const String & part_name) const;
    DiskPtr getDiskForDetachedPart(const String & part_name) const;
    bool storesDataOnDisk() const override { return true; }
    Strings getDataPaths() const override;
    
    ReservationPtr reserveSpace(UInt64 expected_size) const;
    
    static ReservationPtr reserveSpace(UInt64 expected_size, SpacePtr space);
    static ReservationPtr tryReserveSpace(UInt64 expected_size, SpacePtr space);
    
    ReservationPtr reserveSpacePreferringTTLRules(
        const StorageMetadataPtr & metadata_snapshot,
        UInt64 expected_size,