Struct lsst::afw::table::io::ArchiveIndexSchema

struct ArchiveIndexSchema

Schema for the index catalog that specifies where objects are stored in the data catalogs.

Each row in the index catalog corresponds to a combination of an object and a data catalog, and contains the range of rows used by that object in the catalog (in the ‘row0’ and ‘nrows’ fields). The ‘cat.archive’ field indicates which catalog in the archive the index entry refers to (where 0 is the index itself, and 1 is the first data catalog), and ‘cat.persistable’ refers to which catalog the index entry refers to from the perspective of the saved object.

An object may thus have more than one row in the index, but the ‘id’ and ‘name’ fields must be the same for all index entires that correspond to a single object. These contain, respectively, the unique ID returned by OutputArchive::put and the name returned by Persistable::getPersistenceName() and used by InputArchive to look up a PersistableFactory in the registry.