mirror of
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112 lines
3.9 KiB
Python
112 lines
3.9 KiB
Python
#coding:utf-8
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"""
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ID: issue-8252
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/8252
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TITLE: Incorrect subquery unnesting with complex dependencies (SubQueryConversion = true)
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DESCRIPTION:
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NOTES:
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[14.09.2024] pzotov
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1. Parameter 'SubQueryConversion' currently presents only in FB 5.x and _NOT_ in FB 6.x.
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Because of that, testing version are limited only for 5.0.2. FB 6.x currently is NOT tested.
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2. Custom driver config object is created here for using 'SubQueryConversion = true'.
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3. Additional test was made for this issue: tests/functional/tabloid/test_aae2ae32.py
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[18.01.2025] pzotov
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Resultset of cursor that executes using instance of selectable PreparedStatement must be stored
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in some variable in order to have ability close it EXPLICITLY (before PS will be freed).
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Otherwise access violation raises during Python GC and pytest hangs at final point (does not return control to OS).
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This occurs at least for: Python 3.11.2 / pytest: 7.4.4 / firebird.driver: 1.10.6 / Firebird.Qa: 0.19.3
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The reason of that was explained by Vlad, 26.10.24 17:42 ("oddities when use instances of selective statements").
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Confirmed bug on 5.0.2.1497.
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Checked on 5.0.2.1499-5fa4ae6.
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"""
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import pytest
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from firebird.qa import *
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from firebird.driver import driver_config, connect, NetProtocol
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db = db_factory()
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act = python_act('db', substitutions = [ ('[ \t]+',' ') ])
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test_sql = """
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select /* TRACE_ME */ first 5 1 x
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from sales s
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where exists (
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select 1 from customer c
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where
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s.cust_no = c.cust_no
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and ( s.cust_no = c.cust_no
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or
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s.cust_no = c.cust_no
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)
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);
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"""
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#-----------------------------------------------------------
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def replace_leading(source, char="."):
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stripped = source.lstrip()
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return char * (len(source) - len(stripped)) + stripped
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#-----------------------------------------------------------
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@pytest.mark.version('>=5.0.2,<6')
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def test_1(act: Action, capsys):
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srv_cfg = driver_config.register_server(name = 'test_srv_gh_8252', config = '')
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db_cfg_name = f'db_cfg_8252'
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db_cfg_object = driver_config.register_database(name = db_cfg_name)
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db_cfg_object.server.value = srv_cfg.name
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db_cfg_object.database.value = 'employee'
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db_cfg_object.config.value = f"""
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SubQueryConversion = true
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"""
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with connect(db_cfg_name, user = act.db.user, password = act.db.password) as con:
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cur = con.cursor()
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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'")
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for r in cur:
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print(r[0],r[1])
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ps = cur.prepare(test_sql)
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# Show explained plan:
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print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) )
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# ::: NB ::: 'ps' returns data, i.e. this is SELECTABLE expression.
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# We have to store result of cur.execute(<psInstance>) in order to
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# close it explicitly.
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# Otherwise AV can occur during Python garbage collection and this
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# causes pytest to hang on its final point.
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# Explained by hvlad, email 26.10.24 17:42
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rs = cur.execute(ps)
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for r in rs:
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print(r[0])
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rs.close() # <<< EXPLICITLY CLOSING CURSOR RESULTS
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ps.free()
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con.rollback()
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act.expected_stdout = """
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SubQueryConversion true
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Sub-query
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....-> Filter
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........-> Table "CUSTOMER" as "C" Access By ID
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............-> Bitmap
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................-> Index "RDB$PRIMARY22" Unique Scan
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Select Expression
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....-> First N Records
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........-> Filter
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............-> Table "SALES" as "S" Full Scan
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1
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1
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1
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1
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1
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"""
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act.stdout = capsys.readouterr().out
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assert act.clean_stdout == act.clean_expected_stdout
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