issue_comments

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 } } } }

Here's how to get a list of virtual tables: https://stackoverflow.com/questions/46617118/how-to-fetch-names-of-virtual-tables