* _blob_hash= checking plus refactored to use new BadRequest class, refs #1050
* Replace BlobView with new .blob renderer, closes#1050
* .blob downloads on arbitrary queries, closes#1051
Queries with reserved words or characters according to the SQLite
FTS5 query language could cause errors.
Queries are now escaped like so:
dog cat => "dog" "cat"
Datasette previously only supported one type of faceting: exact column value counting.
With this change, faceting logic is extracted out into one or more separate classes which can implement other patterns of faceting - this is discussed in #427, but potential upcoming facet types include facet-by-date, facet-by-JSON-array, facet-by-many-2-many and more.
A new plugin hook, register_facet_classes, can be used by plugins to add in additional facet classes.
Each class must implement two methods: suggest(), which scans columns in the table to decide if they might be worth suggesting for faceting, and facet_results(), which executes the facet operation and returns results ready to be displayed in the UI.
Simon Willison