Added/Updated tests\bugs\gh_8252_test.py: Checked on 5.0.2.1499-5fa4ae6.

tests/bugs/gh_8252_test.py

@@ -0,0 +1,91 @@
+#coding:utf-8
+
+"""
+ID:          issue-8252
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/8252
+TITLE:       Incorrect subquery unnesting with complex dependencies (SubQueryConversion = true)
+DESCRIPTION:
+NOTES:
+    [14.09.2024] pzotov
+    1. Parameter 'SubQueryConversion' currently presents only in FB 5.x and _NOT_ in FB 6.x.
+       Because of that, testing version are limited only for 5.0.2. FB 6.x currently is NOT tested.
+    2. Custom driver config object is created here for using 'SubQueryConversion = true'.
+
+    Confirmed bug on 5.0.2.1497.
+    Checked on 5.0.2.1499-5fa4ae6.
+"""
+
+import pytest
+from firebird.qa import *
+from firebird.driver import driver_config, connect, NetProtocol
+
+db = db_factory()
+
+act = python_act('db', substitutions = [ ('[ \t]+',' ') ])
+
+test_sql = """
+    select /* TRACE_ME */ first 5 1 x
+    from sales s
+    where exists (
+        select 1 from customer c
+        where
+            s.cust_no = c.cust_no
+            and ( s.cust_no = c.cust_no
+                  or
+                  s.cust_no = c.cust_no
+                )
+    );
+"""
+
+#-----------------------------------------------------------
+
+def replace_leading(source, char="."):
+    stripped = source.lstrip()
+    return char * (len(source) - len(stripped)) + stripped
+
+#-----------------------------------------------------------
+
+@pytest.mark.version('>=5.0.2,<6')
+def test_1(act: Action, capsys):
+
+    srv_cfg = driver_config.register_server(name = 'test_srv_gh_8252', config = '')
+    db_cfg_name = f'db_cfg_8252'
+    db_cfg_object = driver_config.register_database(name = db_cfg_name)
+    db_cfg_object.server.value = srv_cfg.name
+    db_cfg_object.database.value = 'employee'
+    db_cfg_object.config.value = f"""
+        SubQueryConversion = true
+    """
+
+    with connect(db_cfg_name, user = act.db.user, password = act.db.password) as con:
+        cur = con.cursor()
+        cur.execute("select g.rdb$config_name, g.rdb$config_value from rdb$database r left join rdb$config g on g.rdb$config_name = 'SubQueryConversion'")
+        for r in cur:
+            print(r[0],r[1])
+
+        ps = cur.prepare(test_sql)
+        print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) )
+        for r in cur.execute(ps):
+            print(r[0])
+        con.rollback()
+
+
+    act.expected_stdout = """
+        SubQueryConversion true
+        Sub-query
+        ....-> Filter
+        ........-> Table "CUSTOMER" as "C" Access By ID
+        ............-> Bitmap
+        ................-> Index "RDB$PRIMARY22" Unique Scan
+        Select Expression
+        ....-> First N Records
+        ........-> Filter
+        ............-> Table "SALES" as "S" Full Scan
+        1
+        1
+        1
+        1
+        1
+    """
+    act.stdout = capsys.readouterr().out
+    assert act.clean_stdout == act.clean_expected_stdout