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53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
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#coding:utf-8
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#
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# id: bugs.core_4530
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# title: DB_KEY based join of two tables may be ineffective
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# decription: Order of expressions in the join condition could negatively affect the generated plan and thus performance
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# tracker_id: CORE-4530
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# min_versions: ['3.0']
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# versions: 3.0
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# qmid: None
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import pytest
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from firebird.qa import db_factory, isql_act, Action
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# version: 3.0
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# resources: None
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substitutions_1 = []
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init_script_1 = """
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recreate table t (id int, constraint t_pk primary key(id) using index t_pk_idx);
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commit;
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"""
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db_1 = db_factory(page_size=4096, sql_dialect=3, init=init_script_1)
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test_script_1 = """
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set planonly;
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-- This query had bad generated plan before fix core-4530:
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-- PLAN JOIN (X A ORDER RDB$PRIMARY4, Z NATURAL)
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select count(*)
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from (select id, rdb$db_key k from t a order by id) x
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left join t z on x.k = z.rdb$db_key; -------------------- left side: `x.k`, right side: `z.rdb$db_key`
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select count(*)
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from (select id, rdb$db_key k from t a order by id) x
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left join t z on z.rdb$db_key = x.k; -------------------- left side: `z.rdb$db_key`, right side: `x.k`
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"""
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act_1 = isql_act('db_1', test_script_1, substitutions=substitutions_1)
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expected_stdout_1 = """
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PLAN JOIN (X A ORDER T_PK_IDX, Z INDEX ())
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PLAN JOIN (X A ORDER T_PK_IDX, Z INDEX ())
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"""
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@pytest.mark.version('>=3.0')
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def test_core_4530_1(act_1: Action):
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act_1.expected_stdout = expected_stdout_1
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act_1.execute()
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assert act_1.clean_expected_stdout == act_1.clean_stdout
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