Query: Consider optimizing out superflous Distinct()

[divega]

Distinct() is superfluous if applied to a superset of the key properties of a single query source. A query like this:

var query = context.Products
    .OrderBy(p => p.UnitPrice ?? 0)
    .Skip(5)
    .Take(15)
    .Distinct()
    .Take(5);

Could even be reduced to:

var query = context.Products
    .OrderBy(p => p.UnitPrice ?? 0)
    .Skip(5)
    .Take(5);