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51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
#coding:utf-8
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"""
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ID: issue-4848
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ISSUE: 4848
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TITLE: DB_KEY based join of two tables may be ineffective
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DESCRIPTION:
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Order of expressions in the join condition could negatively affect the generated plan
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and thus performance
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JIRA: CORE-4530
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FBTEST: bugs.core_4530
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"""
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import pytest
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from firebird.qa import *
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init_script = """
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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 = db_factory(init=init_script)
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test_script = """
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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 = isql_act('db', test_script)
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expected_stdout = """
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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_1(act: Action):
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act.expected_stdout = expected_stdout
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act.execute()
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assert act.clean_stdout == act.clean_expected_stdout
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