mirror of
https://github.com/FirebirdSQL/firebird-qa.git
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111 lines
3.2 KiB
Python
111 lines
3.2 KiB
Python
#coding:utf-8
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"""
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ID: issue-7137
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/7137
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TITLE: Optimizer regression: bad plan (HASH instead of JOIN) is chosen for some inner joins
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NOTES:
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[26.04.2022] pzotov
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Confirmed bug (ineffective execution plan) on 3.0.9.33560 (09.02.2022).
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Checked on 6.0.0.336, 5.0.1.1383, 4.0.5.3086, 3.0.10.33569 (24.02.2022) - all fine.
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"""
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import pytest
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from firebird.qa import *
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init_sql = """
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recreate table test_c(x int);
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commit;
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recreate table test_a(
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id int unique using index test_a_pk
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,ico int
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,name varchar(50)
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);
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create index test_a_name on test_a(name);
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recreate table test_b(
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id int primary key using index test_b_pk
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,ico int
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,name varchar(50)
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);
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recreate table test_c(
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id int primary key using index test_c_pk
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,pid_a int references test_a(id) using index test_c_fk
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);
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insert into test_a(id, ico, name)
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select row_number()over(), mod( row_number()over(), 10 ), ascii_char(64 + mod( row_number()over(), 10 ))
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from rdb$types
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rows 200;
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insert into test_b(id, ico, name)
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select row_number()over()-1, mod( row_number()over(), 10 ), ascii_char(64 + mod( row_number()over(), 10 ))
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from rdb$types, rdb$types
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rows 10000;
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insert into test_c(id, pid_a)
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select row_number()over(), 1 + mod( row_number()over(), 100 )
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from rdb$types, rdb$types
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rows 10000;
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commit;
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set statistics index test_a_pk;
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set statistics index test_a_name;
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set statistics index test_b_pk;
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set statistics index test_c_pk;
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set statistics index test_c_fk;
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commit;
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"""
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db = db_factory(init = init_sql)
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query_lst = [
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"""
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select 1
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from test_a a
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join test_b b on b.ico = a.ico
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join test_c c on c.pid_a = a.id
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where b.id = 0 and a.name = b.name
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""",
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]
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act = python_act('db')
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#---------------------------------------------------------
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def replace_leading(source, char="."):
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stripped = source.lstrip()
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return char * (len(source) - len(stripped)) + stripped
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#---------------------------------------------------------
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@pytest.mark.version('>=3.0.9')
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def test_1(act: Action, capsys):
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with act.db.connect() as con:
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cur = con.cursor()
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for q in query_lst:
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with cur.prepare(q) as ps:
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print( '\n'.join([replace_leading(s) for s in ps.detailed_plan .split('\n')]) )
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expected_stdout = """
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Select Expression
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....-> Nested Loop Join (inner)
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........-> Filter
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............-> Table "TEST_B" as "B" Access By ID
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................-> Bitmap
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....................-> Index "TEST_B_PK" Unique Scan
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........-> Filter
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............-> Table "TEST_A" as "A" Access By ID
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................-> Bitmap
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....................-> Index "TEST_A_NAME" Range Scan (full match)
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........-> Filter
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............-> Table "TEST_C" as "C" Access By ID
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................-> Bitmap
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....................-> Index "TEST_C_FK" Range Scan (full match)
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"""
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act.expected_stdout = expected_stdout
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act.stdout = capsys.readouterr().out
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assert act.clean_stdout == act.clean_expected_stdout
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