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Join with 2 AND-ed conditions where one is LIKE/ILIKE returns too many results #2715

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monetdb-team opened this issue Nov 30, 2020 · 0 comments
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@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2010-11-05 17:48:23 +0100
From: @swingbit
To: SQL devs <>
Version: 2.40.1 (Oct2010) [obsolete]
CC: @njnes

Last updated: 2011-03-28 17:31:23 +0200

Comment 15176

Date: 2010-11-05 17:48:23 +0100
From: @swingbit

User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-GB; rv:1.9.1.12) Gecko/20100907 Fedora/3.5.12-1.fc12 Firefox/3.5.12 GTB7.1
Build Identifier:

The following query returns too many results:

START TRANSACTION;

CREATE TABLE a(id INT, a1 string, a2 string);
INSERT INTO a VALUES (1,'kind','a1');
INSERT INTO a VALUES (2,'kind','b4');
INSERT INTO a VALUES (1,'family','xx');
INSERT INTO a VALUES (2,'family','yy');
INSERT INTO a VALUES (1,'country','EP');
INSERT INTO a VALUES (2,'country','US');

CREATE TABLE b(b1 string, b2 string);
INSERT INTO b VALUES ('country', 'EP');

SELECT *
FROM a,b
WHERE a.a1 = b.b1
AND a.a2 LIKE b.b2;

ROLLBACK;

It behaves as if the two join conditions where OR-ed, rather than AND-ed.
Notice that both join conditions return the correct result if used alone, only when AND-ed they go wrong.

Reproducible: Always

Steps to Reproduce:

1.run the provided script
2.
3.

Actual Results:

+------+---------+------+---------+------+
| id | a1 | a2 | b1 | b2 |
+======+=========+======+=========+======+
| 1 | country | EP | country | EP |
| 2 | country | US | country | EP |
+------+---------+------+---------+------+

Expected Results:

+------+---------+------+---------+------+
| id | a1 | a2 | b1 | b2 |
+======+=========+======+=========+======+
| 1 | country | EP | country | EP |
+------+---------+------+---------+------+

Comment 15185

Date: 2010-11-10 12:55:42 +0100
From: @sjoerdmullender

Changeset 9aee83da8fcf made by Sjoerd Mullender sjoerd@acm.org in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=9aee83da8fcf

Changeset description:

Added test for bug #2715.

Comment 15615

Date: 2011-03-28 17:31:23 +0200
From: @sjoerdmullender

The Mar2011 version has been released.

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