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123 lines
3.6 KiB
Python
123 lines
3.6 KiB
Python
#coding:utf-8
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"""
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ID: issue-4314
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/4314
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TITLE: Sub-optimal predicate checking while selecting from a view [CORE3981]
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DESCRIPTION:
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NOTES:
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[20.08.2024] pzotov
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Checked on 6.0.0.438, 5.0.2.1479, 4.0.6.3142, 3.0.12.33784.
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"""
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import locale
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import re
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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 rr(
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rel_name varchar(63)
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,id int
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,fid int
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);
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recreate table rf(
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rel_name varchar(63)
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,fid int
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,fnm varchar(63)
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);
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insert into rr
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select a.rdb$relation_name, a.rdb$relation_id, a.rdb$field_id
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from rdb$relations a
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;
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insert into rf select f.rdb$relation_name, f.rdb$field_id, f.rdb$field_name
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from rdb$relation_fields f
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;
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commit;
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alter table rr add constraint rr_rel_name_unq unique (rel_name);
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create index rr_id on rr (id);
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alter table rf add constraint rf_fnm_rel_name_unq unique(fnm, rel_name);
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create index rf_rel_name on rf(rel_name);
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recreate view v as
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select r.rel_name, abs(r.id) as id
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from rr r
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left
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join rf on r.rel_name = rf.rel_name and r.fid = rf.fid
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where r.id < 128;
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set statistics index rr_rel_name_unq;
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set statistics index rr_id;
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set statistics index rf_fnm_rel_name_unq;
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set statistics index rf_rel_name;
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commit;
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"""
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db = db_factory(init = init_sql)
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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')
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def test_1(act: Action, capsys):
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query_from_view = """
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select /* trace_tag: VIEW */ v.rel_name as v_rel_name, v.id as v_id from v
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where id = 0
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"""
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query_from_dt = """
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select /* trace_tag: DERIVED TABLE */ d.rel_name as d_rel_name, d.id as d_id
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from (
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select r.rel_name, abs(r.id) as id
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from rr r
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left
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join rf on r.rel_name = rf.rel_name and r.fid = rf.fid
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where r.id < 128
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) d
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where d.id = 0
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"""
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with act.db.connect() as con:
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cur = con.cursor()
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for test_sql in (query_from_view, query_from_dt):
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ps = cur.prepare(test_sql)
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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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....-> Filter
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........-> Nested Loop Join (outer)
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............-> Filter
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................-> Table "RR" as "V R" Access By ID
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....................-> Bitmap
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........................-> Index "RR_ID" Range Scan (upper bound: 1/1)
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............-> Filter
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................-> Table "RF" as "V RF" Access By ID
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....................-> Bitmap
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........................-> Index "RF_REL_NAME" Range Scan (full match)
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Select Expression
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....-> Filter
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........-> Nested Loop Join (outer)
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............-> Filter
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................-> Table "RR" as "D R" Access By ID
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....................-> Bitmap
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........................-> Index "RR_ID" Range Scan (upper bound: 1/1)
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............-> Filter
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................-> Table "RF" as "D RF" Access By ID
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....................-> Bitmap
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........................-> Index "RF_REL_NAME" 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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