Added/Updated tests\bugs\gh_7665_test.py: Checked on 3.0.11.33695, 4.0.3.2966, 5.0.0.1121: all OK.

tests/bugs/gh_7665_test.py

@@ -0,0 +1,63 @@
+#coding:utf-8
+
+"""
+ID:          issue-7665
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7665
+TITLE:       Wrong result ordering in LEFT JOIN query
+DESCRIPTION:
+NOTES:
+    Confirmed bug on 3.0.11.33691, 4.0.3.2957 (FB 5.x seems not affected).
+    Checked on 3.0.11.33695, 4.0.3.2966, 5.0.0.1121: all OK.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = f"""
+    set list on;
+    create table tmain (x int primary key);
+    create table tdetl (x int primary key, y int references tmain);
+    commit;
+
+    insert into tmain values (1);
+    insert into tmain values (2);
+    insert into tmain values (3);
+    insert into tmain values (4);
+    insert into tdetl values (1, 1);
+    insert into tdetl values (2, 1);
+    insert into tdetl values (3, 4);
+    insert into tdetl values (4, 2);
+
+    select a.x, b.x
+    from tdetl a
+    left outer join tmain b
+      on
+         a.y = b.x
+         and a.x = b.x
+    order by a.x
+    ;
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """
+    X                               1
+    X                               1
+
+    X                               2
+    X                               <null>
+
+    X                               3
+    X                               <null>
+
+    X                               4
+    X                               <null>
+"""
+
+@pytest.mark.version('>=3.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout