Build collection dependencies and cache layouts

test/test_incremental.ml

@@ -120,3 +120,80 @@ let cases =
         in
         check_equal_string "wrapped" (string_of_int min_int) (Value.to_string result) );
   ]
+
+let plan text = Graph.build (Anf.program (Specialize.program (infer text)))
+
+let plan_of_fixture name = Graph.build (Anf.program (Specialize.program (infer (read_fixture name))))
+
+let graph_cases =
+  [
+    ( "the example plan is a source, a filter and a map",
+      fun () ->
+        let plan = plan_of_fixture "expensive_order.delta" in
+        check_equal_int "three nodes" 3 (List.length plan.Graph.pl_nodes);
+        let nodes = plan.Graph.pl_nodes in
+        check "source first" (match (List.nth nodes 0).Graph.n_kind with Graph.Source -> true | _ -> false);
+        check "filter second"
+          (match (List.nth nodes 1).Graph.n_kind with Graph.Filter _ -> true | _ -> false);
+        check "map last" (match (List.nth nodes 2).Graph.n_kind with Graph.Map _ -> true | _ -> false);
+        check_equal_string "output" "collection (string, int)" (Types.pp plan.Graph.pl_output) );
+    ( "the revenue plan ends in a sum accumulator",
+      fun () ->
+        let plan = plan_of_fixture "revenue.delta" in
+        let root = Graph.node_of_id plan (match plan.Graph.pl_result with Graph.Result_collection id -> id | _ -> -1) in
+        check "sum" (match root.Graph.n_kind with Graph.Sum -> true | _ -> false);
+        check "accumulator cache" (root.Graph.n_cache = Graph.Accumulator);
+        check_equal_string "linear output" "int" (Types.pp plan.Graph.pl_output) );
+    ( "the count query counts the retained rows",
+      fun () ->
+        let plan = plan_of_fixture "count_large.delta" in
+        check_equal_int "three nodes" 3 (List.length plan.Graph.pl_nodes);
+        let root =
+          match plan.Graph.pl_result with
+          | Graph.Result_collection id -> Graph.node_of_id plan id
+          | Graph.Result_scalar _ ->
+              fail "plan" "expected a node result";
+              { Graph.n_id = -1; n_kind = Graph.Source; n_input = None; n_element = Types.TInt; n_cache = Graph.No_cache; n_span = Location.none }
+        in
+        check "count" (match root.Graph.n_kind with Graph.Count -> true | _ -> false) );
+    ( "collection nodes record their consumers",
+      fun () ->
+        let plan = plan_of_fixture "expensive_order.delta" in
+        check_equal_string "source consumers" "1" (Util.join "," (List.map string_of_int plan.Graph.pl_consumers.(0)));
+        check_equal_string "filter consumers" "2" (Util.join "," (List.map string_of_int plan.Graph.pl_consumers.(1)));
+        check_equal_string "map has no consumers" "" (Util.join "," (List.map string_of_int plan.Graph.pl_consumers.(2))) );
+    ( "an identity query has a single source node",
+      fun () ->
+        let plan = plan "input rows : collection int\nquery q = rows\n" in
+        check_equal_int "one node" 1 (List.length plan.Graph.pl_nodes);
+        check "the result is the source"
+          (match plan.Graph.pl_result with Graph.Result_collection 0 -> true | _ -> false) );
+    ( "a plan dump is deterministic",
+      fun () ->
+        Ident.reset ();
+        Types.reset ();
+        Anf.reset ();
+        let first = Graph.dump (plan_of_fixture "expensive_order.delta") in
+        Ident.reset ();
+        Types.reset ();
+        Anf.reset ();
+        let second = Graph.dump (plan_of_fixture "expensive_order.delta") in
+        check_equal_string "identical" first second );
+    ( "an integer query that only uses the input is a plain plan",
+      fun () ->
+        let plan = plan "input rows : collection int\nquery q = rows |> sum\n" in
+        check_equal_int "two nodes" 2 (List.length plan.Graph.pl_nodes);
+        check "integer output" (Types.repr plan.Graph.pl_output = Types.TInt) );
+    ( "a constant integer query produces no collection nodes",
+      fun () ->
+        let plan = plan "input rows : collection int\nquery q = 40 + 2\n" in
+        check_equal_int "no nodes" 0 (List.length plan.Graph.pl_nodes);
+        check "scalar result" (match plan.Graph.pl_result with Graph.Result_scalar _ -> true | _ -> false) );
+    ( "shared collection temporaries are reuse",
+      fun () ->
+        let plan =
+          plan
+            "input rows : collection int\nquery q = rows |> filter (fun r -> r > 0) |> map (fun r -> r + 1) |> sum\n"
+        in
+        check_equal_int "four nodes" 4 (List.length plan.Graph.pl_nodes) );
+  ]