fix RQL BETWEEN regression for properties over links (#7965)

CHANGELOG.md

@@ -8,7 +8,7 @@
 
 ### Fixed
 * <How do the end-user experience this issue? what was the impact?> ([#????](https://github.com/realm/realm-core/issues/????), since v?.?.?)
-* None.
+* Fixed an "invalid column key" exception when using a RQL "BETWEEN" query on an int or timestamp property across links. ([#7935](https://github.com/realm/realm-core/issues/7935), since v14.10.1)
 
 ### Breaking changes
 * None.
@@ -171,7 +171,7 @@
 
 ### Enhancements
 * It is no longer an error to set a base url for an App with a trailing slash - for example, `https://services.cloud.mongodb.com/` instead of `https://services.cloud.mongodb.com` - before this change that would result in a 404 error from the server ([PR #7791](https://github.com/realm/realm-core/pull/7791)).
-* Performance has been improved for range queries on integers and timestamps. Requires that you use the "BETWEEN" operation in MQL or the Query::between() method when you build the query. (PR [#7785](https://github.com/realm/realm-core/pull/7785))
+* Performance has been improved for range queries on integers and timestamps. Requires that you use the "BETWEEN" operation in RQL or the Query::between() method when you build the query. (PR [#7785](https://github.com/realm/realm-core/pull/7785))
 * Expose `Obj::add_int()` in the bindgen spec. ([PR #7797](https://github.com/realm/realm-core/pull/7797)).
 
 ### Fixed

src/realm/parser/driver.cpp

@@ -644,7 +644,7 @@ Query BetweenNode::visit(ParserDriver* drv)
 
     auto tmp = prop->visit(drv);
     const ObjPropertyBase* obj_prop = dynamic_cast<const ObjPropertyBase*>(tmp.get());
-    if (obj_prop) {
+    if (obj_prop && !obj_prop->links_exist()) {
         if (tmp->get_type() == type_Int) {
             auto min_val = min->visit(drv, type_Int);
             auto max_val = max->visit(drv, type_Int);

test/test_parser.cpp

@@ -6100,6 +6100,41 @@ TEST(Parser_Between)
     CHECK_THROW_ANY(verify_query(test_context, table, "NONE scores between {10, 12}", 1));
 }
 
+TEST(Test_Between_OverLinks)
+{
+    Group g;
+    TableRef parent = g.add_table("Parent");
+    TableRef child = g.add_table("Child");
+
+    ColKey ck_child = parent->add_column(*child, "child");
+    ColKey ck_int = child->add_column(type_Int, "int");
+    ColKey ck_timestamp = child->add_column(type_Timestamp, "timestamp");
+
+    constexpr size_t num_children = 100;
+    for (size_t i = 0; i < num_children; ++i) {
+        auto obj = child->create_object();
+        obj.set(ck_int, (int)i);
+        obj.set(ck_timestamp, Timestamp{int64_t(i), 0});
+        parent->create_object().set(ck_child, obj.get_key());
+        parent->create_object().set(ck_child, obj.get_key());
+    }
+    parent->create_object(); // null link
+
+    verify_query(test_context, child, "int BETWEEN {0, 100}", 100);
+    verify_query(test_context, child, "timestamp BETWEEN {$0, $1}", {Timestamp{0, 0}, Timestamp{100, 0}}, 100);
+    verify_query(test_context, child, "int BETWEEN {1, 2}", 2);
+    verify_query(test_context, child, "timestamp BETWEEN {$0, $1}", {Timestamp{1, 0}, Timestamp{2, 0}}, 2);
+    verify_query(test_context, child, "int BETWEEN {-1, -2}", 0);
+    verify_query(test_context, child, "timestamp BETWEEN {$0, $1}", {Timestamp{-1, 0}, Timestamp{-2, 0}}, 0);
+
+    verify_query(test_context, parent, "child.int BETWEEN {0, 100}", 200);
+    verify_query(test_context, parent, "child.timestamp BETWEEN {$0, $1}", {Timestamp{0, 0}, Timestamp{100, 0}}, 200);
+    verify_query(test_context, parent, "child.int BETWEEN {1, 2}", 4);
+    verify_query(test_context, parent, "child.timestamp BETWEEN {$0, $1}", {Timestamp{1, 0}, Timestamp{2, 0}}, 4);
+    verify_query(test_context, parent, "child.int BETWEEN {-1, -2}", 0);
+    verify_query(test_context, parent, "child.timestamp BETWEEN {$0, $1}", {Timestamp{-1, 0}, Timestamp{-2, 0}}, 0);
+}
+
 TEST(Parser_PrimaryKey)
 {
     UUID u1("3b241101-e2bb-4255-8caf-4136c566a961");