[
https://issues.apache.org/jira/browse/DERBY-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487447
]
Bryan Pendleton commented on DERBY-2526:
----------------------------------------
In the "good" case, the OptimizerImpl's predicateList contains two predicates:
[0]: bvw.c1 = b4.c7
[1]: b3.c8 = bvw.c5
which seems all well and good. But in the "bad" case, the predicateList
contains:
[0]: b3.c8=b4.c7
[1]: bvw2.c1 = b4.c7
[2]: b3.c8 = bvw2.c5
and while the second and third predicates are fine, that first one is
completely bogus.
So now I will try to figure out where that extra erroneous predicate is coming
from.
> Wrong query results due to column ordering in UNION view
> --------------------------------------------------------
>
> Key: DERBY-2526
> URL: https://issues.apache.org/jira/browse/DERBY-2526
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.0.2.1, 10.1.3.1, 10.2.2.0, 10.3.0.0
> Reporter: Bryan Pendleton
> Assigned To: Bryan Pendleton
> Attachments: badQuery.log, derby-2526.sql, goodQuery.log
>
>
> I think both select statements in the attached repro script should return 1
> row, but in fact the first statement returns 1 row and the second returns
> zero rows.
> The only difference between the two statements is that the columns in the
> UNION view are listed in a different order (bvw vs. bvw2).
> This seems like a bug to me; the order of the columns in the view definition
> shouldn't matter, should it?
> As Army noted on the derby-dev list, the fact that this reproduces with 10.0
> means that it is not caused by some of the 10.2 optimizer changes. Something
> else is going wrong.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
