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/**
 * Catalog service provides methods to access schema object's descriptors of exact version and/or last actual version at given timestamp,
 * which is logical point-in-time.
 *
 * <p>Catalog service listens distributed schema update event, stores/restores schema evolution history (schema versions) for time-travelled
 * queries purposes and for lazy data evolution purposes.
 */
public interface CatalogService extends EventProducer<CatalogEvent, CatalogEventParameters> {
    @Nullable Catalog catalog(int catalogVersion);

    @Nullable CatalogTableDescriptor table(String tableName, long timestamp);

    @Nullable CatalogTableDescriptor table(int tableId, long timestamp);

    @Nullable CatalogTab
leDescriptorCatalogTableDescriptor table(int tableId, int catalogVersion);

    Collection<CatalogTableDescriptor> tables(int catalogVersion);

    // rest of the access methods
}