SphinxQL (the SQL dialect of Sphinx), supports LIMIT clause, but only the
oldschool type, without OFFSET. So, instead of "LIMIT 10 OFFSET 20" you
have to write "LIMIT 20, 10". I needed to do pagination, but I couldn't use
the pagination extension because it includes the OFFSET (for all the normal
SQLs), so I wrote it like this:
ds.limit(Sequel.lit("#{(page - 1) * per_page}, #{per_page}"))
It would be cool if #limit would accept virtual rows, so I could write
ds.limit{[(page - 1) * per_page, per_page]} # => LIMIT 20, 10
Other than this very specific purpose of using SphinxQL, I think this would
be useful if someone wanted to use an SQL function for LIMIT values, or any
SQL expression (however rare it might be).
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