Added/Updated tests\bugs\gh_7569_test.py: Confirmed problem on 5.0.0.1033. Checked on 5.0.0.1046 -- all fine.

tests/bugs/gh_7569_test.py

@@ -0,0 +1,66 @@
+#coding:utf-8
+
+"""
+ID:          issue-7569
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7569
+TITLE:       Multi-level order by and offset/fetch ignored on parenthesized query expressions
+NOTES:
+    [12.05.2023] pzotov
+    Confirmed problem on 5.0.0.1033. Checked on 5.0.0.1046 -- all fine.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = """
+    set list on;
+    recreate table rowdata (id int generated by default as identity);
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    insert into rowdata default values;
+    commit;
+
+
+    select id_a
+    from
+    (
+      select id as id_a
+      from rowdata
+      order by id
+      offset 2 rows fetch next 5 rows only
+    )
+    order by id_a desc
+    offset 2 rows fetch next 2 rows only;
+
+    (
+      select id as id_b
+      from rowdata
+      order by id
+      offset 2 rows fetch next 5 rows only
+    )
+    order by id_b desc
+    offset 2 rows fetch next 2 rows only;
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """
+    ID_A                            5
+    ID_A                            4
+    ID_B                            5
+    ID_B                            4
+"""
+
+@pytest.mark.version('>=5.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute()
+    assert act.clean_stdout == act.clean_expected_stdout