Add direct query lookup tests.

Author: WaVEV

tests/lookup_/tests.py

@@ -73,3 +73,90 @@ def test_eq_and_in(self):
             "lookup__book",
             [{"$match": {"$and": [{"isbn": {"$in": ("12345", "56789")}}, {"title": "Moby Dick"}]}}],
         )
+
+    def test_gt(self):
+        with self.assertNumQueries(1) as ctx:
+            list(Number.objects.filter(num__gt=2))
+        self.assertAggregateQuery(
+            ctx.captured_queries[0]["sql"],
+            "lookup__number",
+            [
+                {"$match": {"num": {"$gt": 2}}},
+                {"$addFields": {"num": "$num"}},
+                {"$sort": SON([("num", 1)])},
+            ],
+        )
+
+    def test_gte(self):
+        with self.assertNumQueries(1) as ctx:
+            list(Number.objects.filter(num__gte=2))
+        self.assertAggregateQuery(
+            ctx.captured_queries[0]["sql"],
+            "lookup__number",
+            [
+                {"$match": {"num": {"$gte": 2}}},
+                {"$addFields": {"num": "$num"}},
+                {"$sort": SON([("num", 1)])},
+            ],
+        )
+
+    def test_subquery_filter_constant(self):
+        with self.assertNumQueries(1) as ctx:
+            list(Number.objects.filter(num__in=Number.objects.filter(num__gt=2).values("num")))
+        self.assertAggregateQuery(
+            ctx.captured_queries[0]["sql"],
+            "lookup__number",
+            [
+                {
+                    "$lookup": {
+                        "as": "__subquery0",
+                        "from": "lookup__number",
+                        "let": {},
+                        "pipeline": [
+                            {"$match": {"num": {"$gt": 2}}},
+                            {
+                                "$facet": {
+                                    "group": [
+                                        {"$group": {"_id": None, "tmp_name": {"$addToSet": "$num"}}}
+                                    ]
+                                }
+                            },
+                            {
+                                "$project": {
+                                    "num": {
+                                        "$ifNull": [
+                                            {
+                                                "$getField": {
+                                                    "input": {"$arrayElemAt": ["$group", 0]},
+                                                    "field": "tmp_name",
+                                                }
+                                            },
+                                            [],
+                                        ]
+                                    }
+                                }
+                            },
+                        ],
+                    }
+                },
+                {
+                    "$set": {
+                        "__subquery0": {
+                            "$cond": {
+                                "if": {
+                                    "$or": [
+                                        {"$eq": [{"$type": "$__subquery0"}, "missing"]},
+                                        {"$eq": [{"$size": "$__subquery0"}, 0]},
+                                    ]
+                                },
+                                "then": {},
+                                "else": {"$arrayElemAt": ["$__subquery0", 0]},
+                            }
+                        }
+                    }
+                },
+                {"$match": {"$expr": {"$in": ["$num", "$__subquery0.num"]}}},
+                {"$addFields": {"num": "$num"}},
+                {"$sort": SON([("num", 1)])},
+            ],
+        )