Hello,

I'm trying to implement vtable, and I don't understand what is meaning of usable
field in sqlite3_index_constraint struct?

Can I assume it will be false when my vtable is joined by that field with some
other table?

If yes - in what other situations this filed will be false?

If not - so what it's about? :)

Cheers

Grzegorz Marszalek
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