importer - use the DS high-level API

Description

The importer uses the low-level DS reader/writer API. This is because it also supports non-datastore formats (like KML, GML, GeoJSON). However, some datastores (most notably geogig) are very slow with the low-level api and prefer the high-level api.

See PR for more details.

Environment

None

Status

Assignee

David Blasby

Reporter

David Blasby

Triage

None

Fix versions

Affects versions

Components

Priority

Medium
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