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91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
#coding:utf-8
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"""
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ID: issue-5096
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ISSUE: 5096
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TITLE: Regression: MIN/MAX with a join ignores possible index navigation
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DESCRIPTION:
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JIRA: CORE-4798
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FBTEST: bugs.core_4798
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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(from_backup='mon-stat-gathering-3_0.fbk')
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test_script = """
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recreate table test(x int);
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commit;
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insert into test select rand()*100 from (select 1 i from rdb$types rows 50) a, (select 1 i from rdb$types rows 50) b;
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commit;
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create index test_x on test(x);
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commit;
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set term ^;
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execute block as
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begin
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-- ####################################
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-- S E T T I N G T H R E S H O L D S
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-- ####################################
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rdb$set_context('USER_SESSION','NAT_READS_MAX_THRESHOLD', '0');
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rdb$set_context('USER_SESSION','IDX_READS_MAX_THRESHOLD', '20'); -- increased 27.07.2016
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end
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^
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set term ;^
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alter sequence g_gather_stat restart with 0;
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execute procedure sp_truncate_stat;
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commit;
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execute procedure sp_gather_stat; ------- catch statistics BEFORE measured statement(s)
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commit;
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set term ^;
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execute block as
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declare v_dummy int;
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begin
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select min(a.x) from test a join test b on a.x = b.x join test c on b.x = c.x into v_dummy;
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end
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^
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set term ;^
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execute procedure sp_gather_stat; ------- catch statistics AFTER measured statement(s)
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commit;
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set list on;
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-- 3.0.0.31374 (Beta 1):
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-- natural_reads 2500
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-- indexed_reads 1839808
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-- 3.0.0.31852:
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-- natural_reads 0
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-- indexed_reads 6
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-- 4.0.0.313:
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-- natural_reads 0
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-- indexed_reads 18
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select
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iif( natural_reads <= nat_max, 'acceptable, <= ' || nat_max, 'abnormal, ' || natural_reads || ' > ' || nat_max ) as natural_reads
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,iif( indexed_reads <= idx_max, 'acceptable, <= ' || idx_max, 'abnormal, ' || indexed_reads || ' > ' || idx_max ) as indexed_reads
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from (
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select
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v.natural_reads
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,v.indexed_reads
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,cast(rdb$get_context('USER_SESSION','NAT_READS_MAX_THRESHOLD') as int) nat_max
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,cast(rdb$get_context('USER_SESSION','IDX_READS_MAX_THRESHOLD') as int) idx_max
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from v_agg_stat v
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);
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"""
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act = isql_act('db', test_script)
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expected_stdout = """
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NATURAL_READS acceptable, <= 0
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INDEXED_READS acceptable, <= 20
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"""
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@pytest.mark.version('>=3.0')
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def test_1(act: Action):
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act.expected_stdout = expected_stdout
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act.execute()
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assert act.clean_stdout == act.clean_expected_stdout
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