Added/Updated tests\bugs\gh_7683_test.py: Checked on 5.0.0.1145, 4.0.3.2975 -- all fine.

tests/bugs/gh_7683_test.py

@@ -0,0 +1,51 @@
+#coding:utf-8
+
+"""
+ID:          issue-7683
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7683
+TITLE:       rdb$time_zone_util.transitions returns an infinite resultset
+DESCRIPTION:
+NOTES:
+    Confirmed bug on 5.0.0.1132, 4.0.3.2966
+    Checked on 5.0.0.1145, 4.0.3.2975 -- all fine.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = f"""
+    set list on;
+    select max(cnt) as max_cnt
+    from (
+        select
+            rdb$start_timestamp start_timestamp,
+            rdb$end_timestamp stop_timestamp,
+            rdb$effective_offset tz_offset,
+            count(*) cnt
+        from (
+            select * from
+            rdb$time_zone_util.transitions(
+                'Europe/Moscow',
+                '0001-01-01 00:00:00.0000 +00:00',
+                '9999-12-31 23:59:59.9999 +00:00'
+            )
+            rows 1000
+        )
+        group by 1,2,3
+    )
+    ;
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """
+    MAX_CNT                         1
+"""
+
+@pytest.mark.version('>=4.0.3')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout