PatchCatalog

class of dascore.io.index.catalog

source

PatchCatalog(
    resolver ,
    backend = None,
    syncer = None,
    queries = (),
    residuals = (),
    revision = None,
    order = None,
    ids = None,
    default_order = None,
)

Query-composable metadata catalog over the spool index tables.

Instances are lightweight views: select returns a new catalog sharing the backend and resolver with composed predicates. Mutation (add, update, remove) is only allowed on the root view.

Methods

Name	Description
add	Add live patches to the catalog.
attr_names	Attr names known to the index.
close	Close the backend (root and all views share it).
coord_names	Coord names known to the index.
from_directory	Catalog over a directory of fiber files.
get_metadata	Index-level metadata.
get_patch	Materialize one patch: resolve, then exact two-stage trim.
order_by	Return a view presenting rows ordered by an attribute or coord.
ordered_ids	The view’s patch ids in presentation order (ids only, cheap).
remove	Remove sources (and their patches) from the catalog.
resolve_row	Resolve one flat-relation row and apply exact residual selects.
restrict	Return a view keeping the presented rows an array selects.
select	Compose a selection; validation is eager, execution is lazy.
sources	The sources table.
to_df	The spool-facing flat patch-row relation under the selection.
transfer_is_lossy	Whether a table-level transfer of this view would lose state.
from_file	Catalog over a single fiber file.
update	Sync a directory-backed catalog with the filesystem.
window	Return a view restricted to a slice of the presented rows.