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Added/Updated tests\bugs\gh_3218_test.py: Checked on 6.0.0.218, 5.0.1.1318.

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pavel-zotov 2024-01-20 20:27:52 +03:00
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#coding:utf-8
"""
ID: issue-3218
ISSUE: 3218
TITLE: Optimizer fails applying stream-local predicates before merging [CORE2832]
DESCRIPTION:
We evaluate number of records in rdb$relation_fields for which corresponding rows in rdb$relations have ID < 10.
This value ('cnt_chk') must be equal to the number of indexed reads for this table when we run test query ('chk_sql').
Before fix number of indexed reads in rdb$relation_fields was equal to the TOTAL number of rows in this table.
FBTEST: bugs.gh_3218
NOTES:
[20.01.2024] pzotov
Confirmed problem on 5.0.0.442: number of indexed reads was equal to the total count of records in rdb$relation_fields.
Checked on 6.0.0.218, 5.0.1.1318.
"""
import pytest
from pathlib import Path
from firebird.qa import *
init_sql = """
set term ^;
create or alter procedure sp_get_relations returns(
rdb$relation_id type of column rdb$relations.rdb$relation_id,
rdb$relation_name type of column rdb$relations.rdb$relation_name
) as
begin
for
select
rdb$relation_id,
rdb$relation_name
from rdb$relations
into
rdb$relation_id,
rdb$relation_name
do
begin
suspend;
end
end
^
set term ;^
commit;
"""
db = db_factory(init = init_sql)
act = python_act('db')
#----------------------------------------------------------
def replace_leading(source, char="#"):
stripped = source.lstrip()
return char * (len(source) - len(stripped)) + stripped
#----------------------------------------------------------
@pytest.mark.version('>=5.0')
def test_1(act: Action, capsys):
with act.db.connect() as con:
cur = con.cursor()
cur.execute("select rdb$relation_id from rdb$relations where rdb$relation_name = upper('rdb$relation_fields')")
rf_rel_id = None
for r in cur:
rf_rel_id = r[0]
assert rf_rel_id
cur.execute("select count(iif(r.rdb$relation_id < 10, 1, null)) cnt_chk, count(*) as cnt_all from rdb$relation_fields rf left join rdb$relations r on rf.rdb$relation_name = r.rdb$relation_name and r.rdb$relation_id < 10")
cnt_chk, cnt_all = cur.fetchall()[0][:2]
#------------------------------------------------------
result_map = {}
chk_sql = 'select 1 from sp_get_relations r join rdb$relation_fields f on f.rdb$relation_name = r.rdb$relation_name where r.rdb$relation_id < 10'
with cur.prepare(chk_sql) as ps:
cur.execute(chk_sql)
tabstat1 = [ p for p in con.info.get_table_access_stats() if p.table_id == rf_rel_id ]
cur.fetchall()
tabstat2 = [ p for p in con.info.get_table_access_stats() if p.table_id == rf_rel_id ]
print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) ) # explained plan, with preserving indents by replacing leading spaces with '#'
idx_reads = (tabstat2[0].indexed if tabstat2[0].indexed else 0)
if tabstat1:
idx_reads -= (tabstat1[0].indexed if tabstat1[0].indexed else 0)
print('Result:')
if idx_reads == 0 or idx_reads > cnt_chk:
print(f'POOR! Number of records in rdb$relation_fields: 1) to be filtered: {cnt_chk}, 2) total: {cnt_all}. Number of indexed_reads: {idx_reads}')
else:
print('Acceptable.')
act.expected_stdout = """
Select Expression
####-> Nested Loop Join (inner)
########-> Filter
############-> Procedure "SP_GET_RELATIONS" as "R" Scan
########-> Filter
############-> Table "RDB$RELATION_FIELDS" as "F" Access By ID
################-> Bitmap
####################-> Index "RDB$INDEX_4" Range Scan (full match)
Result:
Acceptable.
"""
act.stdout = capsys.readouterr().out
assert act.clean_stdout == act.clean_expected_stdout