firebird-qa/tests/bugs/core_4702_test.py

#coding:utf-8
#
# id:           bugs.core_4702
# title:        Regression: Join order in v3 is less optimal than in v2.x
# decription:   
# tracker_id:   CORE-4702
# min_versions: ['3.0']
# versions:     3.0
# qmid:         None

import pytest
from firebird.qa import db_factory, isql_act, Action

# version: 3.0
# resources: None

substitutions_1 = []

init_script_1 = """
    recreate table trial_line (
        code_trial_line integer not null,
        code_trial integer not null
    );
    
    recreate table trial (
        code_trial integer not null,
        code_prize integer not null,
        bydate date
    );
    
    
    recreate table prize (
        code_prize integer not null,
        name varchar(70) not null
    );
    commit;
    
    
    insert into prize(code_prize, name)
    with recursive t (n) as (
      select 1 from rdb$database
      union all
      select n+1 from t where n < 1000
    )
    select n+8000, '' from t;
    commit;
    
    insert into trial(code_trial, code_prize, bydate)
    with recursive t (n) as (
      select 1 from rdb$database
      union all
      select n+1 from t where n < 1000
    )
    select t1.n + (t2.n-1)*1000, mod(t1.n, 20)+8001, dateadd(t1.n day to date '01.01.2000')
    from t t1, t t2
    where t1.n + (t2.n-1)*1000 < 100000;
    commit;
    
    insert into trial_line(code_trial_line, code_trial)
    with recursive t (n) as (
      select 1 from rdb$database
      union all
      select n+1 from t where n < 1000
    )
    select t1.n + (t2.n-1)*1000, mod(t1.n + (t2.n-1)*1000, 99998)+1
    from t t1, t t2
    where t1.n + (t2.n-1)*1000 < 150000;
    commit;
    
    alter table trial add constraint pk_trial primary key (code_trial);
    alter table prize add constraint pk_prize primary key (code_prize);
    alter table trial_line add constraint pk_trial_line primary key (code_trial_line);
    
    alter table trial_line add constraint fk_trial_line_trial foreign key (code_trial) references trial (code_trial);
    alter table trial add constraint fk_trial_prize foreign key (code_prize) references prize (code_prize);
    
    create index idx_bydate on trial(bydate);
    commit;
  """

db_1 = db_factory(page_size=4096, sql_dialect=3, init=init_script_1)

test_script_1 = """
    set planonly;
    select count(*)
    from
       trial
       join prize on prize.code_prize = trial.code_prize
       join trial_line on trial_line.code_trial = trial.code_trial
    where trial.bydate between date '01.01.2000' and date '31.12.2000'; 
    -- Confirmed ineffective plan in WI-T3.0.0.31374 Firebird 3.0 Beta 1:
    -- PLAN JOIN (TRIAL INDEX (IDX_BYDATE), TRIAL_LINE INDEX (FK_TRIAL_LINE_TRIAL), PRIZE INDEX (PK_PRIZE))
  """

act_1 = isql_act('db_1', test_script_1, substitutions=substitutions_1)

expected_stdout_1 = """
    PLAN JOIN (TRIAL INDEX (IDX_BYDATE), PRIZE INDEX (PK_PRIZE), TRIAL_LINE INDEX (FK_TRIAL_LINE_TRIAL))
  """

@pytest.mark.version('>=3.0')
def test_1(act_1: Action):
    act_1.expected_stdout = expected_stdout_1
    act_1.execute()
    assert act_1.clean_expected_stdout == act_1.clean_stdout