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Added/Updated tests\bugs\gh_7118_test.py: Checked on 3.0.11.33665, 4.0.3.2904, 5.0.0.964

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pavel-zotov 2023-03-01 20:31:15 +03:00
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#coding:utf-8
"""
ID: issue-7118
ISSUE: https://github.com/FirebirdSQL/firebird/issues/7118
TITLE: Chained JOIN .. USING across the same column names may be optimized badly
NOTES:
[01.03.2023] pzotov
Checked on 3.0.11.33665, 4.0.3.2904, 5.0.0.964
"""
import pytest
from firebird.qa import *
db = db_factory()
test_script = """
recreate table t1 (id int primary key, col int);
create index t1_col on t1 (col);
recreate table t2 (id int primary key, col int);
create index t2_col on t2 (col);
recreate table t3 (id int primary key, col int);
create index t3_col on t3 (col);
set plan;
select *
from t1 t1
inner join t2 t2 on t1.id = t2.id
inner join t3 t3 on t1.id = t3.id
where
t1.col = 0
and t2.col = 0
and t3.col = 0;
-- PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11), T3 INDEX (RDB$PRIMARY12))
select *
from t1 t1
inner join t2 t2 on t1.id = t2.id
inner join t3 t3 on t2.id = t3.id
where
t1.col = 0
and t2.col = 0
and t3.col = 0;
-- PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11), T3 INDEX (RDB$PRIMARY12))
select *
from t1 t1
inner join t2 t2 on t1.id = t2.id
inner join t3 t3 on t1.id = t3.id and t2.id = t3.id
where
t1.col = 0
and t2.col = 0
and t3.col = 0;
-- PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11), T3 INDEX (RDB$PRIMARY12))
select *
from t1 t1
inner join t2 t2 using (id)
inner join t3 t3 using (id)
where
t1.col = 0
and t2.col = 0
and t3.col = 0;
-- The last query with USING syntax gets a different (usually worse) plan.
-- This issue is closely related to #3357, because using (id) is internally
-- transformed into coalesce(t1.id, t2.id) = t3.id.
-- PLAN HASH (JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11)), T3 INDEX (T3_COL))
"""
act = isql_act('db', test_script)
""
expected_stdout = """
PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
"""
@pytest.mark.version('>=3.0.9')
def test_1(act: Action):
act.expected_stdout = expected_stdout
act.execute(combine_output = True)
assert act.clean_stdout == act.clean_expected_stdout