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86 lines
2.5 KiB
Python
86 lines
2.5 KiB
Python
#coding:utf-8
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"""
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ID: issue-7118
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/7118
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TITLE: Chained JOIN .. USING across the same column names may be optimized badly
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NOTES:
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[01.03.2023] pzotov
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Checked on 3.0.11.33665, 4.0.3.2904, 5.0.0.964
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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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recreate table t1 (id int primary key, col int);
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create index t1_col on t1 (col);
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recreate table t2 (id int primary key, col int);
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create index t2_col on t2 (col);
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recreate table t3 (id int primary key, col int);
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create index t3_col on t3 (col);
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set plan;
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select *
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from t1 t1
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inner join t2 t2 on t1.id = t2.id
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inner join t3 t3 on t1.id = t3.id
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where
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t1.col = 0
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and t2.col = 0
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and t3.col = 0;
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-- PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11), T3 INDEX (RDB$PRIMARY12))
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select *
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from t1 t1
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inner join t2 t2 on t1.id = t2.id
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inner join t3 t3 on t2.id = t3.id
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where
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t1.col = 0
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and t2.col = 0
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and t3.col = 0;
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-- PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11), T3 INDEX (RDB$PRIMARY12))
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select *
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from t1 t1
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inner join t2 t2 on t1.id = t2.id
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inner join t3 t3 on t1.id = t3.id and t2.id = t3.id
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where
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t1.col = 0
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and t2.col = 0
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and t3.col = 0;
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-- PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11), T3 INDEX (RDB$PRIMARY12))
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select *
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from t1 t1
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inner join t2 t2 using (id)
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inner join t3 t3 using (id)
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where
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t1.col = 0
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and t2.col = 0
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and t3.col = 0;
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-- The last query with USING syntax gets a different (usually worse) plan.
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-- This issue is closely related to #3357, because using (id) is internally
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-- transformed into coalesce(t1.id, t2.id) = t3.id.
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-- PLAN HASH (JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY11)), T3 INDEX (T3_COL))
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"""
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act = isql_act('db', test_script)
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""
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expected_stdout = """
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PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
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PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
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PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
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PLAN JOIN (T1 INDEX (T1_COL), T2 INDEX (RDB$PRIMARY2), T3 INDEX (RDB$PRIMARY3))
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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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