With code snippets like this: |> where([a, p], a.foo == "bar" or p.bar == "foo") are these predicates being pushed down to the data base? How can the code

With code snippets like this: |> where([a, p], a.foo == "bar" or p.bar == "foo") are these predicates being pushed down to the data base? How can the code expressions be inspected for optimization? Is it using some kind of macro?