On Tuesday, 17 March 2015 at 14:14:19 UTC, Idan Arye wrote:
> The version of where that works on .NET objects takes a delegate - but the version used to generate SQL takes an `Expression` - https://msdn.microsoft.com/en-us/library/vstudio/bb535040%28v=vs.110%29.aspx

Conceptually Where takes a delegate, which takes an element and returns bool indicating whether the element should pass to the next stage. That's how its semantics is defined.