Is there any way to make use of a case sensitive index when doing a case 
insensitive query?

I can, in fact, 'unroll' the matches if they're not very long, like

select * where x = 'foo' union
select * where x = 'foO' union
select * where x = 'fOo' union ...

which is much, much faster than doing

select * where lower(x) = 'foo'

which requires a table scan.

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