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From "Mamta A. Satoor (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5584) Select statement with subqueries with group by and count distinct statements returns wrong number of results
Date Thu, 02 Feb 2012 00:09:53 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198351#comment-13198351
] 

Mamta A. Satoor commented on DERBY-5584:
----------------------------------------

Hi Bryan, thanks for your work on this jira. 

I haven't worked in code related to DISTINCT and GROUP BY but your solution looks like the
correct appraoch. Looks like Derby has made an incorrect assumption about the extra column
when there are multiple passes through the inner table. 

I am working on DERBY-4631 and noticed that an extra column gets pulled in (which might not
be part of the SELECT list) for ORDER BY columns which sounds similar to the extra column
for this jira.

                
> Select statement with subqueries with group by and count distinct statements returns
wrong number of results
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5584
>                 URL: https://issues.apache.org/jira/browse/DERBY-5584
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.7.1.1
>         Environment: Output from sysinfo
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.6
> java.runtime.version: 1.6.0_20-b02
> --------- Derby Information --------
> JRE - JDBC: Java SE 6 - JDBC 4.0
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derby.jar] 10.7.1.1 - (1040133)
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derbytools.jar] 10.7.1.1 - (1040133)
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derbynet.jar] 10.7.1.1 - (1040133)
> [/home/piotrz/Desktop/db-derby-10.7.1.1-bin/lib/derbyclient.jar] 10.7.1.1 - (1040133)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale :  [English/United States [en_US]]
> Found support for locale: [cs]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [de_DE]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [es]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [fr]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [hu]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [it]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [ja_JP]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [ko_KR]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [pl]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [pt_BR]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [ru]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [zh_CN]
> 	 version: 10.7.1.1 - (1040133)
> Found support for locale: [zh_TW]
> 	 version: 10.7.1.1 - (1040133)
>            Reporter: Piotr Zgadzaj
>            Assignee: Bryan Pendleton
>         Attachments: patch1.txt, query.log, tests.out, tests.sql, try1.txt
>
>
> Steps to reproduce:
> 1. Create database, connect to database with any JDBC client
> 2. create two tables:
> CREATE TABLE TEST_5 (
>        profile_id INTEGER NOT NULL,
>        group_ref INTEGER NOT NULL,
>        matched_count INTEGER NOT NULL
>    );
>    CREATE TABLE TEST_6 (
>        profile_id INTEGER NOT NULL,
>        group_ref INTEGER NOT NULL,
>        matched_count INTEGER NOT NULL
>    );
> 3. Insert two records for each table:
> insert into test_5 values (1, 10000,1);
> insert into test_5 values (2, 10000, 2);
> insert into test_6 values (1, 10000,1);
> insert into test_6 values (2, 10000, 2);
> 4. Run following statement
> SELECT *
> FROM
>  (SELECT ps1.group_ref,
>    COUNT(DISTINCT ps1.matched_count) AS matched_count
>  FROM test_5 ps1
>  GROUP BY ps1.group_ref,
>    ps1.profile_id
>  ) a,
>  (SELECT ps2.group_ref,
>    COUNT( DISTINCT ps2.matched_count) AS matched_count
>  FROM test_6 ps2
>  GROUP BY ps2.group_ref,
>    ps2.profile_id
>  ) b
> As a result I've got 3 records instead of 4 - at least Oracle 10g
> returns 4 records for this statement. Maybe i'm doing something wrong.
> Do you have any suggestions / possible workarounds for this problem

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