issue_comments

This probably counts as a case study: https://github.com/eyeseast/spatial-data-cooking-show. Even has video.

Seriously, though, this workflow has become integral to my work with reporters and editors across USA TODAY Network. Very often, I get sent a folder of data in mixed formats, with a vague ask of how we should communicate some part of it to users. Datasette and its constellation of tools makes it easy to get a quick look at that data, run exploratory queries, map it and ask questions to figure out what's important to show. And then I export a version of the data that's exactly what I need for display.

I'm realizing I don't know if a virtual table will ever return a count. Maybe it depends on the implementation. For these three, just checking now, it'll always return zero.

That said, I'm not sure there's any downside to having them return zero and caching that. (They're hidden, too.)

It does work, though I think it's probably still worth excluding virtual tables that will always be zero. Here's the same inspection as before, now with --load-extension spatialite:

json { "alltheplaces": { "hash": "0843cfe414439ab903c22d1121b7ddbc643418c35c7f0edbcec82ef1452411df", "size": 963375104, "file": "alltheplaces.db", "tables": { "spatial_ref_sys": { "count": 6215 }, "spatialite_history": { "count": 18 }, "sqlite_sequence": { "count": 2 }, "geometry_columns": { "count": 3 }, "spatial_ref_sys_aux": { "count": 6164 }, "views_geometry_columns": { "count": 0 }, "virts_geometry_columns": { "count": 0 }, "geometry_columns_statistics": { "count": 3 }, "views_geometry_columns_statistics": { "count": 0 }, "virts_geometry_columns_statistics": { "count": 0 }, "geometry_columns_field_infos": { "count": 0 }, "views_geometry_columns_field_infos": { "count": 0 }, "virts_geometry_columns_field_infos": { "count": 0 }, "geometry_columns_time": { "count": 3 }, "geometry_columns_auth": { "count": 3 }, "views_geometry_columns_auth": { "count": 0 }, "virts_geometry_columns_auth": { "count": 0 }, "data_licenses": { "count": 10 }, "sql_statements_log": { "count": 0 }, "states": { "count": 56 }, "counties": { "count": 3234 }, "idx_states_geometry_rowid": { "count": 56 }, "idx_states_geometry_node": { "count": 3 }, "idx_states_geometry_parent": { "count": 2 }, "idx_counties_geometry_rowid": { "count": 3234 }, "idx_counties_geometry_node": { "count": 98 }, "idx_counties_geometry_parent": { "count": 97 }, "idx_places_geometry_rowid": { "count": 1236796 }, "idx_places_geometry_node": { "count": 38163 }, "idx_places_geometry_parent": { "count": 38162 }, "places": { "count": 1332609 }, "SpatialIndex": { "count": 0 }, "ElementaryGeometries": { "count": 0 }, "KNN": { "count": 0 }, "idx_states_geometry": { "count": 56 }, "idx_counties_geometry": { "count": 3234 }, "idx_places_geometry": { "count": 1236796 } } } }