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71 lines
2.4 KiB
Python
71 lines
2.4 KiB
Python
#coding:utf-8
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"""
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ID: issue-2548
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ISSUE: 2548
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TITLE: Query plan is missing for the long query
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DESCRIPTION: test creates table with one index and generates query like:
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select * from ... where
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exists(select ...) and
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exists(select ...) and
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exists(select ...) and
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...
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-- where number of sub-queries is defined by variable SUBQRY_COUNT
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Then we open cursor and ask to show execution plan (in traditional form).
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Plan must have SUBQRY_COUNT lines with the same content: 'PLAN (T1 INDEX (T1_X))'
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JIRA: CORE-2115
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FBTEST: bugs.core_2115
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NOTES:
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[07.09.2023] pzotov
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1. Refactored because old query did use "IN(...)" predicate with lot of literals.
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This query became non-actual since IN-algorithm was changed in
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https://github.com/FirebirdSQL/firebird/commit/0493422c9f729e27be0112ab60f77e753fabcb5b
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("Better processing and optimization if IN <list> predicates (#7707)")
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2. Although firebird-driver and firebird-qa assumes to be used under FB 3.x+, generated script
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was also checked on FB 2.0.7.13318 and FB 2.1.7.18553. Both these old versions can NOT produce
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any output after SUBQRY_COUNT >= 97.
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3. Upper limit for SUBQRY_COUNT currently still the same: 256. After exceeding of this, we get:
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"SQLSTATE = 54001 ... -Too many Contexts of Relation/Procedure/Views. Maximum allowed is 256"
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"""
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import pytest
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from firebird.qa import *
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init_sql = """
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create sequence g;
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recreate table t1(
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x smallint
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);
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commit;
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insert into t1 select mod(gen_id(g,1), 256) from rdb$types,(select 1 i from rdb$types rows 10);
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commit;
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create index t1_x on t1(x);
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commit;
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"""
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db = db_factory(init = init_sql)
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act = python_act('db')
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@pytest.mark.version('>=3.0')
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def test_1(act: Action, capsys):
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SUBQRY_COUNT = 256
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test_sql = """
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select 1 as c
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from t1
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where x = 0 and
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"""
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test_sql += '\n'.join( ( f'exists(select 1 from t1 where x = {i}) and' for i in range(SUBQRY_COUNT-1) ) )
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test_sql += '\n1=1'
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with act.db.connect() as con:
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cur = con.cursor()
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ps = cur.prepare(test_sql)
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print(ps.plan)
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expected_stdout = '\n'.join( ('PLAN (T1 INDEX (T1_X))' for i in range(SUBQRY_COUNT)) )
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#assert '' == capsys.readouterr().out
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assert act.clean_stdout == act.clean_expected_stdout
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