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65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
#coding:utf-8
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"""
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ID: issue-3357
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/3357
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TITLE: Bad execution plan if some stream depends on multiple streams via a function [CORE2975]
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NOTES:
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[04.03.2023] pzotov
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Discussed with dimitr, letters 01-mar-2023 18:37 and 04-mar-2023 10:38.
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Test must verify that execution plan uses NESTED LOOPS rather than HASH JOIN.
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Because of this, tables must be filled with approximately equal volume of data.
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Confirmed bug on 3.0.9.33548 (28-dec-2021), plan was:
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PLAN HASH (JOIN (T1 INDEX (T1_COL), T2 INDEX (T2_ID)), T3 NATURAL)
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Checked on 5.0.0.970, 4.0.3.2904, 3.0.11.33665.
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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()
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test_script = """
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set bail on;
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create table T1 (ID int, COL int);
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create table T2 (ID int);
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create table T3 (ID int);
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create view v_data as
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select iif(mod(i,2) = 0, null, i) as id, iif(mod(i,2) = 1, null, i) as col
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from (
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select row_number()over() as i
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from rdb$types a, rdb$types b
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rows 5000
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);
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commit;
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insert into t1 select id, col from v_data;
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insert into t2 select id from v_data;
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insert into t3 select id from v_data;
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commit;
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create index T1_ID on T1 (ID);
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create unique index T1_COL on T1 (COL);
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create index T2_ID on T2 (ID);
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create index T3_ID on T3 (ID);
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set planonly;
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select *
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from T1
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join T2 on T2.ID = T1.ID
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join T3 on T3.ID = coalesce(T1.ID, T2.ID)
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where T1.COL = 1;
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"""
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act = isql_act('db', test_script)
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expected_stdout = """
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PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (T2_ID), T3 INDEX (T3_ID))
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"""
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@pytest.mark.version('>=3.0.9')
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def test_1(act: Action):
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act.expected_stdout = expected_stdout
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act.execute(combine_output = True)
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assert act.clean_stdout == act.clean_expected_stdout
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