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78 lines
2.1 KiB
Python
78 lines
2.1 KiB
Python
#coding:utf-8
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"""
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ID: optimizer.left-join-02
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TITLE: LEFT OUTER JOIN with no match and IS NULL in WHERE clause
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DESCRIPTION:
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TableX LEFT OUTER JOIN TableY with no match, thus result should contain all NULLs for TableY
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references. WHERE clause contains IS NULL on a field which is also in a single segment index.
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The WHERE clause shouldn't be distributed to the joined table..
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FBTEST: functional.arno.optimizer.opt_left_join_02
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"""
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import pytest
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from firebird.qa import *
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init_script = """CREATE TABLE Colors (
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ColorID INTEGER NOT NULL,
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ColorName VARCHAR(20)
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);
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CREATE TABLE Flowers (
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FlowerID INTEGER NOT NULL,
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FlowerName VARCHAR(30),
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ColorID INTEGER
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);
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COMMIT;
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/* Value 0 represents -no value- */
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INSERT INTO Colors (ColorID, ColorName) VALUES (0, 'Not defined');
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INSERT INTO Colors (ColorID, ColorName) VALUES (1, 'Red');
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INSERT INTO Colors (ColorID, ColorName) VALUES (2, 'Yellow');
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/* insert some data with references */
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INSERT INTO Flowers (FlowerID, FlowerName, ColorID) VALUES (1, 'Rose', 1);
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INSERT INTO Flowers (FlowerID, FlowerName, ColorID) VALUES (2, 'Tulip', 2);
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INSERT INTO Flowers (FlowerID, FlowerName, ColorID) VALUES (3, 'Gerbera', 0);
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COMMIT;
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/* Normally these indexes are created by the primary/foreign keys,
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but we don't want to rely on them for this test */
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CREATE UNIQUE ASC INDEX PK_Colors ON Colors (ColorID);
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CREATE UNIQUE ASC INDEX PK_Flowers ON Flowers (FlowerID);
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CREATE ASC INDEX FK_Flowers_Colors ON Flowers (ColorID);
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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 = """SET PLAN ON;
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/* LEFT JOIN should return all NULLs */
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SELECT
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f.FlowerName,
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c.ColorName
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FROM
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Flowers f
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LEFT JOIN Colors c ON (1 = 0)
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WHERE
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c.ColorID IS NULL;"""
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act = isql_act('db', test_script)
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expected_stdout = """PLAN JOIN (F NATURAL, C NATURAL)
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FLOWERNAME COLORNAME
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============================== ====================
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Rose <null>
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Tulip <null>
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Gerbera <null>"""
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@pytest.mark.version('>=3')
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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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