mirror of
https://github.com/FirebirdSQL/firebird-qa.git
synced 2025-01-22 21:43:06 +01:00
143 lines
3.6 KiB
Python
143 lines
3.6 KiB
Python
#coding:utf-8
|
|
|
|
"""
|
|
ID: issue-4701
|
|
ISSUE: 4701
|
|
TITLE: Poor performance of explicit cursors containing correlated subqueries in the select list
|
|
DESCRIPTION:
|
|
JIRA: CORE-4379
|
|
FBTEST: bugs.core_4379
|
|
"""
|
|
|
|
import pytest
|
|
from firebird.qa import *
|
|
|
|
init_script = """
|
|
recreate sequence g;
|
|
commit;
|
|
recreate table t(id int primary key using index t_pk_idx, f01 int);
|
|
commit;
|
|
delete from t;
|
|
insert into t select gen_id(g,1), gen_id(g,0)*10 from rdb$types,rdb$types
|
|
rows 20000;
|
|
commit;
|
|
"""
|
|
|
|
db = db_factory(from_backup='mon-stat-gathering-3_0.fbk', init=init_script)
|
|
|
|
test_script = """
|
|
set list on;
|
|
|
|
execute procedure sp_truncate_stat;
|
|
commit;
|
|
execute procedure sp_gather_stat;
|
|
commit;
|
|
|
|
set plan on;
|
|
update t a set f01 = (select f01 from t x where x.id>a.id order by id rows 1);
|
|
set plan off;
|
|
rollback;
|
|
|
|
execute procedure sp_gather_stat;
|
|
commit;
|
|
|
|
select natural_reads, indexed_reads from v_agg_stat_tabs where table_name = upper('T');
|
|
|
|
--------------------------
|
|
|
|
execute procedure sp_truncate_stat;
|
|
commit;
|
|
execute procedure sp_gather_stat;
|
|
commit;
|
|
|
|
set plan on;
|
|
set term ^;
|
|
execute block as
|
|
declare c_cur cursor for (select (select f01 from t x where x.id>a.id order by id rows 1) as next_f01 from t a);
|
|
declare v_next_f01 int;
|
|
begin
|
|
open c_cur;
|
|
while (1=1) do
|
|
begin
|
|
fetch c_cur into v_next_f01;
|
|
if (row_count = 0) then leave;
|
|
update t set f01 = :v_next_f01 where current of c_cur;
|
|
end
|
|
close c_cur;
|
|
end
|
|
^
|
|
set term ;^
|
|
set plan off;
|
|
rollback;
|
|
|
|
execute procedure sp_gather_stat;
|
|
commit;
|
|
|
|
-- On LI-T3.0.0.30981 (29-mar02014) it was 200029999 indexed reads here:
|
|
select natural_reads, indexed_reads from v_agg_stat_tabs where table_name = upper('T');
|
|
|
|
-----------------------------
|
|
|
|
execute procedure sp_truncate_stat;
|
|
commit;
|
|
execute procedure sp_gather_stat;
|
|
commit;
|
|
|
|
set plan on;
|
|
set term ^;
|
|
execute block as
|
|
declare v_key char(8);
|
|
declare c_cur cursor for (select a.rdb$db_key as r_key, (select f01 from t x where x.id>a.id order by id rows 1) as next_f01 from t a);
|
|
declare v_next_f01 int;
|
|
begin
|
|
open c_cur;
|
|
while (1=1) do
|
|
begin
|
|
fetch c_cur into v_key, v_next_f01;
|
|
if (row_count = 0) then leave;
|
|
update t set f01 = :v_next_f01 where rdb$db_key = :v_key;
|
|
end
|
|
close c_cur;
|
|
end
|
|
^
|
|
set term ;^
|
|
set plan off;
|
|
rollback;
|
|
|
|
execute procedure sp_gather_stat;
|
|
commit;
|
|
|
|
-- On LI-T3.0.0.30981 (29-mar02014) it was 200049999 indexed reads here:
|
|
select natural_reads, indexed_reads from v_agg_stat_tabs where table_name = upper('T');
|
|
"""
|
|
|
|
act = isql_act('db', test_script, substitutions = [('(--\\s+)?line \\d+, col(umn)? \\d+', '')])
|
|
# -- line 2, column 7
|
|
|
|
expected_stdout = """
|
|
PLAN (X ORDER T_PK_IDX)
|
|
PLAN (A NATURAL)
|
|
NATURAL_READS 20000
|
|
INDEXED_READS 39999
|
|
|
|
PLAN (C_CUR X ORDER T_PK_IDX)
|
|
PLAN (C_CUR A NATURAL)
|
|
PLAN (C_CUR X ORDER T_PK_IDX)
|
|
NATURAL_READS 20000
|
|
INDEXED_READS 39999
|
|
|
|
PLAN (C_CUR X ORDER T_PK_IDX)
|
|
PLAN (C_CUR A NATURAL)
|
|
PLAN (C_CUR X ORDER T_PK_IDX)
|
|
PLAN (T INDEX ())
|
|
NATURAL_READS 20000
|
|
INDEXED_READS 59999
|
|
"""
|
|
|
|
@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
|
|
|