During place indexing (`sql/functions.sql: placex_insert()`) a place is assigned the partition based on its country code (`sql/functions.sql: get_partition(country_code)`). It checks in the `country_name` table.
-Most countries have their own parition, some share a partition. Thus partition counts vary greatly.
+Most countries have their own partition, some share a partition. Thus partition counts vary greatly.
Several database tables are split by partition to allow queries to run against less indices and improve caching.
## Data files
-### `data/country_name.sql`
+### data/country_name.sql
Export from existing database table plus manual changes. `country_default_language_code` most taken from [https://wiki.openstreetmap.org/wiki/Nominatim/Country_Codes](), see `utils/country_languages.php`.
-### `data/country_osm_grid.sql`
+### data/country_osm_grid.sql
`country_grid.sql` merges territories by country. Then uses `function.sql: quad_split_geometry` to split each country into multiple [Quadtree](https://en.wikipedia.org/wiki/Quadtree) polygons for faster point-in-polygon lookups.