see sqlite3_index_info.estimatedCost

http://www.sqlite.org/cvstrac/chngview?cn=5649

> AFAICT, when you have a join where one table has a good index, the
> virtual table cannot signal that it has an even better index.  I could
> not follow the index-selection logic well enough to have any
> suggestions how to improve things.  In the fts case, this breaks the
> query because the MATCH operator _only_ works when used to access the
> index.
> 
> -scott

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