Make `And` and `Case` into expression nodes

Allows aliasing, predications, ordering, and various other functions on `And` and `Case` nodes. This brings them in line with other nodes like `Binary` and `Unary`.

1 files changed, 9 insertions, 0 deletions

diff --git a/activerecord/test/cases/arel/nodes/and_test.rb b/activerecord/test/cases/arel/nodes/and_test.rb
index eff54abd91..d123ca9fd0 100644
--- a/activerecord/test/cases/arel/nodes/and_test.rb
+++ b/activerecord/test/cases/arel/nodes/and_test.rb
@@ -16,6 +16,15 @@ module Arel
           assert_equal 2, array.uniq.size
         end
       end
+
+      describe "functions as node expression" do
+        it "allows aliasing" do
+          aliased = And.new(["foo", "bar"]).as("baz")
+
+          assert_kind_of As, aliased
+          assert_kind_of SqlLiteral, aliased.right
+        end
+      end
     end
   end
 end