#coding:utf-8

"""
ID:          issue-5432
ISSUE:       5432
TITLE:       Regression: LEFT JOIN incorrectly pushes COALESCE into the inner stream causing wrong results
DESCRIPTION:
JIRA:        CORE-5149
FBTEST:      bugs.core_5149
"""

import pytest
from firebird.qa import *

db = db_factory()

test_script = """
    -- Confirmed: wrong result on WI-V3.0.0.32380; works fine on LI-V3.0.0.32381.
    recreate table t_stock (
        tnr varchar(16),
        amount integer
    );

    recreate table t_main (
        tnr varchar(16) primary key using index t_main_tnr,
        minb integer
    );

    alter table t_stock
        add constraint fk_t_stock_1
        foreign key (tnr) references t_main (tnr)
        on delete cascade on update cascade
        using index t_stock_tnr
    ;
    commit;

    insert into t_main (tnr, minb) values ('aaa', 0);
    insert into t_main (tnr, minb) values ('bbb', 10);
    insert into t_main (tnr, minb) values ('ccc', 10);
    insert into t_main (tnr, minb) values ('ddd', 10);

    insert into t_stock (tnr, amount) values ('aaa', 100);
    insert into t_stock (tnr, amount) values ('bbb', 5);
    insert into t_stock (tnr, amount) values ('ccc', 15);
    commit;

    set list on;

    select
        a.tnr
        ,a.minb
        ,b.amount as b_amount
        ,coalesce(b.amount,0) as coalesce_b_amt
    from t_main a
    left join t_stock b on a.tnr = b.tnr
    where a.minb > coalesce(b.amount,0)
    order by a.tnr
    ;
"""

act = isql_act('db', test_script)

expected_stdout = """
    TNR                             bbb
    MINB                            10
    B_AMOUNT                        5
    COALESCE_B_AMT                  5

    TNR                             ddd
    MINB                            10
    B_AMOUNT                        <null>
    COALESCE_B_AMT                  0
"""

@pytest.mark.version('>=3.0')
def test_1(act: Action):
    act.expected_stdout = expected_stdout
    act.execute()
    assert act.clean_stdout == act.clean_expected_stdout