Added/Updated tests\bugs\gh_8233_test.py: Checked on 5.0.2.1487-6934878 -- all ok.

tests/bugs/gh_8233_test.py

@@ -0,0 +1,117 @@
+#coding:utf-8
+
+"""
+ID:          issue-8233
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/8233
+TITLE:       SubQueryConversion = true --multiple rows in singleton select
+DESCRIPTION:
+NOTES:
+    [27.08.2024] pzotov
+    1. Confirmed bug on 5.0.1.1485-274af35 (26.08.2024), got for SubQueryConversion=true:
+       "multiple rows in singleton select", gdscodes: (335544652, 335544842)
+    2. 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.
+    3. Table 't1' must have more than one row for bug reproducing. Query must be enclosed in execute block.
+    4. Custom driver config objects are created here, one with SubQueryConversion = true and second with false.
+    
+    Checked on 5.0.2.1487-6934878 -- all ok.
+    Thanks to dimitr for the advice on implementing the test.
+"""
+
+import pytest
+from firebird.qa import *
+from firebird.driver import driver_config, connect, DatabaseError
+
+init_script = """
+create table t1(id int, fld int);
+create table t2(id int, fld int);
+
+insert into t1(id, fld) values(1, 111);
+insert into t1(id, fld) values(2, 222);
+insert into t1(id, fld) values(3, 333);
+insert into t2(id, fld) values(3, 999);
+commit;
+"""
+
+db = db_factory(init=init_script)
+
+act = python_act('db')
+
+#-----------------------------------------------------------
+
+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):
+
+    test_sql = """
+        execute block returns (res int)
+        as
+        begin
+           select first 1 id from t1
+             where exists (select 1 from t2 where t1.id = t2.id)
+             order by t1.id
+             into :res;
+           suspend;
+        end
+    """
+
+    for sq_conv in ('true','false',):
+        srv_cfg = driver_config.register_server(name = f'srv_cfg_8233_{sq_conv}', config = '')
+        db_cfg_name = f'db_cfg_8233_{sq_conv}'
+        db_cfg_object = driver_config.register_database(name = db_cfg_name)
+        db_cfg_object.server.value = srv_cfg.name
+        db_cfg_object.database.value = str(act.db.db_path)
+        db_cfg_object.config.value = f"""
+            SubQueryConversion = {sq_conv}
+        """
+
+        with connect(db_cfg_name, user = act.db.user, password = act.db.password) as con:
+            try:
+                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 explained plan with padding eash line by dots in order to see indentations:
+                print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) )
+
+                # Print data:
+                for r in cur.execute(ps):
+                    print(r[0])
+            except DatabaseError as e:
+                print(e.__str__())
+                print(e.gds_codes)
+
+    act.expected_stdout = f"""
+        SubQueryConversion true
+        Select Expression (line 5, column 12)
+        ....-> Singularity Check
+        ........-> First N Records
+        ............-> Filter
+        ................-> Hash Join (semi)
+        ....................-> Sort (record length: 28, key length: 8)
+        ........................-> Table "T1" Full Scan
+        ....................-> Record Buffer (record length: 25)
+        ........................-> Table "T2" Full Scan
+        3
+        SubQueryConversion false
+        Sub-query
+        ....-> Filter
+        ........-> Table "T2" Full Scan
+        Select Expression (line 5, column 12)
+        ....-> Singularity Check
+        ........-> First N Records
+        ............-> Sort (record length: 28, key length: 8)
+        ................-> Filter
+        ....................-> Table "T1" Full Scan
+        3
+    """
+    act.stdout = capsys.readouterr().out
+    assert act.clean_stdout == act.clean_expected_stdout