[irods#600] Comment out test_files_query_case_sensitive BETWEEN tests

The BETWEEN clause behaves differently for mysql (and mariadb, I assume)
than postgres, and the test_files_query_case_sensitive test assumes that
we are using postgres. In order to avoid this, the BETWEEN sub-tests have
been commented out until such a time as we can make meaningful assertions
about the case-sensitive query with a BETWEEN clause based on the flavor
of database being used by the connected iRODS server.

irods/test/query_test.py

@@ -180,24 +180,27 @@ def test_files_query_case_sensitive(self):
 
         # BETWEEN tests
 
-        result13 = self.sess.query(DataObject.name).filter(
-            Collection.name == self.coll_path).filter(
-            Between(DataObject.name, [self.case_sensitive_obj_name1,
-                                      self.case_sensitive_obj_name1 + "_"])).all()
-        self.assertTrue(result13.has_value(self.case_sensitive_obj_name1))
-        self.assertEqual(len(result13), 1)
-
-        result14 = self.sess.query(DataObject.name).filter(
-            Collection.name == self.coll_path).filter(
-            Between(DataObject.name, [str.lower(self.case_sensitive_obj_name1),
-                                      str.lower(self.case_sensitive_obj_name1) + "_"])).all()
-        self.assertEqual(len(result14), 0)
-
-        result15 = self.sess.query(DataObject.name).filter(
-            Collection.name == self.coll_path).filter(
-            Between(DataObject.name, [str.upper(self.case_sensitive_obj_name1),
-                                      str.upper(self.case_sensitive_obj_name1) + "_"])).all()
-        self.assertEqual(len(result15), 0)
+        # TODO(#600): Uncomment these lines and/or make a new test when database flavor can be detected.
+        # The resultset for BETWEEN queries can differ from database to database.
+
+        #result13 = self.sess.query(DataObject.name).filter(
+        #    Collection.name == self.coll_path).filter(
+        #    Between(DataObject.name, [self.case_sensitive_obj_name1,
+        #                              self.case_sensitive_obj_name1 + "_"])).all()
+        #self.assertTrue(result13.has_value(self.case_sensitive_obj_name1))
+        #self.assertEqual(len(result13), 1)
+
+        #result14 = self.sess.query(DataObject.name).filter(
+        #    Collection.name == self.coll_path).filter(
+        #    Between(DataObject.name, [str.lower(self.case_sensitive_obj_name1),
+        #                              str.lower(self.case_sensitive_obj_name1) + "_"])).all()
+        #self.assertEqual(len(result14), 0)
+
+        #result15 = self.sess.query(DataObject.name).filter(
+        #    Collection.name == self.coll_path).filter(
+        #    Between(DataObject.name, [str.upper(self.case_sensitive_obj_name1),
+        #                              str.upper(self.case_sensitive_obj_name1) + "_"])).all()
+        #self.assertEqual(len(result15), 0)
 
     def test_files_query_case_insensitive(self):
         # This tests that GenQueries are case-insensitive when the case_sensitive