Commits on Dec 8, 2016

1. Add a function for SQL EXISTS expressions. …

   While this is useful for some cases where you don't want to load the
   rows, this won't fill every use case for the expression, as right now
   you wouldn't be able to build a query that references the outer table.
   For us to do that and have it be type safe we'd need overlapping impls
   for `SelectableExpression` (story of my life), which requires
   rust-lang/rust#29864 being implemented.
   
   Fixes #414.

   

   sgrif committed Dec 8, 2016
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