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https://issues.apache.org/jira/browse/DERBY-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A B updated DERBY-3279:
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Attachment: d3279_v1.patch
Attaching a first attempt at resolving this issue.
The problem as described above only occurs in situations where
preprocessing/optimization eliminates a sort. There is already a method called
"adjustForSortElimination()" defined in ResultSetNode, so this patch creates an
alternate signature that takes an OrderByList as an argument. Then, in the
case where sort elimination occurs, we will search a table's predicates to see
if any of them is a multi-probing predicate. If so, we check to see if the
ORDER BY that was eliminated required a DESCENDING sort on the multi-probe
column, and we adjust for that (if needed) by sorting the IN list values into
descending order at execution time. See code comments for details.
I ran derbyall and suites.All with this patch applied and saw no failures.
Review comments are appreciated.
> Derby 10.3.X sorts VARCHAR column incorrectly when table is indexed and
> VARCHAR column contains a value of '00000'
> ------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-3279
> URL: https://issues.apache.org/jira/browse/DERBY-3279
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.3.1.4, 10.3.2.1
> Environment: Rational Application Developer 7.0.0.2 (Eclipse 3.2.2),
> J2RE 1.5.0 IBM J9 2.3 Windows XP
> Reporter: Ajay Bhala
> Assignee: A B
> Attachments: d3279_v1.patch
>
>
> Running the following produces the error seen in Derby 10.3.X but not in
> 10.2.X nor in 10.1.X.
> Don't know if this related to DERBY-3231.
> First query is incorrectly sorted whereas the second one is okay when there
> is an index on the table.
> If the table is not indexed, the sort works correctly in DESC order.
> ------
> create table CHEESE (
> CHEESE_CODE VARCHAR(5),
> CHEESE_NAME VARCHAR(20),
> CHEESE_COST DECIMAL(7,4)
> );
> create index cheese_index on CHEESE (CHEESE_CODE DESC, CHEESE_NAME DESC,
> CHEESE_COST DESC);
> INSERT INTO CHEESE (
> CHEESE_CODE,
> CHEESE_NAME,
> CHEESE_COST)
> VALUES ('00000', 'GOUDA', 001.1234),
> ('00000', 'EDAM', 002.1111),
> ('54321', 'EDAM', 008.5646),
> ('12345', 'GORGONZOLA', 888.2309),
> ('AAAAA', 'EDAM', 999.8888),
> ('54321', 'MUENSTER', 077.9545);
> SELECT * FROM CHEESE
> WHERE (CHEESE_CODE='00000' OR CHEESE_CODE='54321') AND CHEESE_NAME='EDAM'
> ORDER BY CHEESE_CODE DESC, CHEESE_NAME DESC, CHEESE_COST DESC;
> SELECT * FROM CHEESE
> WHERE (CHEESE_CODE='AAAAA' OR CHEESE_CODE='54321') AND CHEESE_NAME='EDAM'
> ORDER BY CHEESE_CODE DESC, CHEESE_NAME DESC, CHEESE_COST DESC;
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