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120 lines
3.3 KiB
Python
120 lines
3.3 KiB
Python
#coding:utf-8
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"""
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ID: issue-5759
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ISSUE: 5759
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TITLE: Bad performance for NULLs filtering inside a navigational index scan
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DESCRIPTION:
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See prototype and explanations for this test in CORE_5435.fbt
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Confirmed improvement:
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3.0.2.32643, 4.0.0.563:
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**********
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PLAN (TEST ORDER TEST_F01_ID)
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1 records fetched
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1143 ms, 2375 read(s), 602376 fetch(es) ---------------- poor :(
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Table Natural Index
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****************************************************
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TEST 300000
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3.0.2.32708, 4.0.0.572:
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**********
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PLAN (TEST ORDER TEST_F01_ID)
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0 ms, 22 read(s), 63 fetch(es) --------------------------- cool :)
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Table Natural Index
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****************************************************
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TEST 20
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JIRA: CORE-5489
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FBTEST: bugs.core_5489
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NOTES:
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[25.11.2023] pzotov
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Writing code requires more care since 6.0.0.150: ISQL does not allow specifying duplicate delimiters without any statements between them (two semicolon, two carets etc).
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"""
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import pytest
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from firebird.qa import *
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db = db_factory(page_size=8192)
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act = python_act('db')
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FETCHES_THRESHOLD = 80
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init_sql = """
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recreate table test
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(
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id int not null,
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f01 int,
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f02 int
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);
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set term ^;
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create or alter procedure sp_add_init_data(a_rows_to_add int)
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as
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declare n int;
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declare i int = 0;
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begin
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n = a_rows_to_add;
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while (i < n) do
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begin
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insert into test(id, f01, f02) values(:i, nullif(mod(:i, :n/20), 0), iif(mod(:i,3)<2, 0, 1))
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returning :i+1 into i;
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end
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end
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^
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set term ;^
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commit;
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execute procedure sp_add_init_data(300000);
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commit;
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create index test_f01_id on test(f01, id);
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create index test_f02_only on test(f02);
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commit;
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"""
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test_script = """
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set list on;
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select count(*) cnt_check
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from (
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select *
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from test
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where f01 -- ###################################################################
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IS NULL -- <<< ::: NB ::: we check here 'f01 is NULL', exactly as ticket says.
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and f02=0 -- ###################################################################
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order by f01, id
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) ;
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"""
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trace = ['time_threshold = 0',
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'log_statement_finish = true',
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'print_plan = true',
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'print_perf = true',
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'log_initfini = false',
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]
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@pytest.mark.version('>=3.0.2')
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def test_1(act: Action):
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act.isql(switches=[], input=init_sql, combine_output = True)
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assert act.clean_stdout == ''
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with act.trace(db_events=trace):
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act.reset()
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act.isql(switches=[], input=test_script, combine_output = True)
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# Process trace
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run_with_plan = ''
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num_of_fetches = 99999999
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for line in act.trace_log:
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if line.lower().startswith('plan ('):
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run_with_plan = line.strip().upper()
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elif 'fetch(es)' in line:
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words = line.split()
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for k in range(len(words)):
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if words[k].startswith('fetch'):
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num_of_fetches = int(words[k-1])
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# Check
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assert run_with_plan == 'PLAN (TEST ORDER TEST_F01_ID)'
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assert num_of_fetches < FETCHES_THRESHOLD
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