#coding:utf-8

"""
ID:          issue-2628
ISSUE:       2628
TITLE:       Extremely slow executing a cross join of 3 tables in Firebird 2.X
DESCRIPTION:
JIRA:        CORE-2200
FBTEST:      bugs.core_2200
"""

import pytest
from firebird.qa import *

db = db_factory()

test_script = """
    -- Confirmed: wrong plan on 2.0.0.12724 and 2.1.0.17798: 'T2' was choosen as drive source,
    -- absence of rows in T3 was ignored, used: PLAN JOIN (T2 NATURAL, T1 NATURAL, T3 NATURAL)

    recreate table t0(id int);
    recreate table t1(id int);
    recreate table t2(id int);
    recreate table t3(id int);
    commit;

    insert into t0 select 1 from rdb$types; -- ,rdb$types;
    commit;


    insert into t1 select * from t0;
    insert into t2 select * from t0;
    --------- ::: NB ::: we do NOT add any row to the table `t3`, it remains empty -----------
    commit;

    set list on;
    select case when count(*) > 100 then 'OK' else 'WRONG' end as t1_has_enough_rows from t1;
    select case when count(*) > 100 then 'OK' else 'WRONG' end as t2_has_enough_rows from t2;

    set plan on;
    set echo on;

    select count(*) from t1, t2, t3;

    select count(*) from t2, t3, t1;

    select count(*) from t3, t2, t1;
"""

act = isql_act('db', test_script)

expected_stdout = """
    T1_HAS_ENOUGH_ROWS              OK
    T2_HAS_ENOUGH_ROWS              OK

    select count(*) from t1, t2, t3;
    PLAN JOIN (T3 NATURAL, T1 NATURAL, T2 NATURAL)
    COUNT                           0

    select count(*) from t2, t3, t1;
    PLAN JOIN (T3 NATURAL, T2 NATURAL, T1 NATURAL)
    COUNT                           0

    select count(*) from t3, t2, t1;
    PLAN JOIN (T3 NATURAL, T2 NATURAL, T1 NATURAL)
    COUNT                           0
"""

@pytest.mark.version('>=3')
def test_1(act: Action):
    act.expected_stdout = expected_stdout
    act.execute()
    assert act.clean_stdout == act.clean_expected_stdout