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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6623) DatabaseMetaDataTest fails intermittently
Date Tue, 24 Jun 2014 08:33:24 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041866#comment-14041866
] 

Knut Anders Hatlen commented on DERBY-6623:
-------------------------------------------

My expectation would be that it only returned one of them. The javadoc says: "Retrieves a
description of a table's optimal set of columns that uniquely identifies a row." And (I, J)
sounds like a less optimal set than (I) or (J), since it's bigger and has some redundancy.

I think the current behaviour is fine, but I see no harm in adding some extra ordering so
that it is deterministic which constraint is used in case of ties.

The reference manual actually has [a topic|https://builds.apache.org/job/Derby-docs/lastSuccessfulBuild/artifact/trunk/out/ref/index.html]
that describes how getBestRowIdentifier() works. It's more detailed than the JDBC specification,
but it does not say anything about ties.

> DatabaseMetaDataTest fails intermittently
> -----------------------------------------
>
>                 Key: DERBY-6623
>                 URL: https://issues.apache.org/jira/browse/DERBY-6623
>             Project: Derby
>          Issue Type: Bug
>          Components: Test
>            Reporter: Dag H. Wanvik
>            Assignee: Dag H. Wanvik
>             Fix For: 10.11.0.0
>
>         Attachments: derby-6623.diff
>
>
> Saw this on the trunk [[http://download.java.net/javadesktop/derby/request_5592737/javadb-task-3883745.html][regression
tests]]:
> testGetXXportedKeys:
> {code}
> junit.framework.AssertionFailedError: Column value mismatch @ column 'FK_NAME', row 3:
>     Expected: >FKEY3<
>     Found:    >FKEY2<
> 	at org.apache.derbyTesting.junit.JDBC.assertRowInResultSet(JDBC.java:1303)
> 	at org.apache.derbyTesting.junit.JDBC.assertRowInResultSet(JDBC.java:1215)
> 	at org.apache.derbyTesting.junit.JDBC.assertFullResultSetMinion(JDBC.java:1102)
> 	at org.apache.derbyTesting.junit.JDBC.assertFullResultSet(JDBC.java:1025)
> 	at org.apache.derbyTesting.junit.JDBC.assertFullResultSet(JDBC.java:982)
> 	at org.apache.derbyTesting.functionTests.tests.jdbcapi.DatabaseMetaDataTest.assertFullResultSet(DatabaseMetaDataTest.java:3930)
> 	at org.apache.derbyTesting.functionTests.tests.jdbcapi.DatabaseMetaDataTest.testGetXXportedKeys(DatabaseMetaDataTest.java:4117)
> 	at org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:118)
> 	at org.apache.derbyTesting.junit.BaseJDBCTestCase.runBareOverridable(BaseJDBCTestCase.java:440)
> 	at org.apache.derbyTesting.junit.BaseJDBCTestCase.runBare(BaseJDBCTestCase.java:457)
> {code}



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