bug: Add test verifying a bug in AshSql with has_many with limit and sort not respected in exists query filters

test/filter_test.exs

@@ -1151,6 +1151,43 @@
            |> length == 1
   end
 
+  test "using exists with has_many with limit" do
+    comment =
+      Comment
+      |> Ash.Changeset.for_create(:create, %{title: "test"})
+      |> Ash.create!()
+
+    for score <- 1..5 do
+      Ash.Changeset.for_create(AshPostgres.Test.Rating, :create, %{
+        score: score,
+        resource_id: comment.id
+      })
+      |> Ash.create!(context: %{data_layer: %{table: "comment_ratings"}})
+    end
+
+    # The top_ratings relationship has limit: 2 and sort: [score: :desc]
+    # So it should only include ratings with scores 5 and 4
+    assert Comment
+           |> Ash.Query.filter(exists(top_ratings, score == 5))
+           |> Ash.read!()
+           |> length() == 1
+
+    assert Comment
+           |> Ash.Query.filter(exists(top_ratings, score == 4))
+           |> Ash.read!()
+           |> length() == 1
+
+    assert Comment
+           |> Ash.Query.filter(exists(top_ratings, score == 3))
+           |> Ash.read!()
+           |> length() == 0
+
+    assert Comment
+           |> Ash.Query.filter(exists(top_ratings, score == 1))
+           |> Ash.read!()
+           |> length() == 0
+  end
+
   test "using `(is_nil(relationship) and other_relation_filter)` will trigger left join" do
     organization =
       Organization

test/support/resources/comment.ex

@@ -113,6 +113,13 @@ defmodule AshPostgres.Test.Comment do
       relationship_context: %{data_layer: %{table: "comment_ratings"}}
     )
 
+    has_many :top_ratings, AshPostgres.Test.Rating do
+      destination_attribute(:resource_id)
+      relationship_context(%{data_layer: %{table: "comment_ratings"}})
+      sort(score: :desc)
+      limit(2)
+    end
+
     has_many(:popular_ratings, AshPostgres.Test.Rating,
       public?: true,
       destination_attribute: :resource_id,