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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-6221) Can't select from SYS.SYSUSERS if you use a WHERE clause in the query
Date Thu, 30 May 2013 15:36:21 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-6221:

    Attachment: derby-6221-01-aa-checkForPasswordProbeAtPreprocessTime.diff

Attaching derby-6221-01-aa-checkForPasswordProbeAtPreprocessTime.diff. This patch moves the
check for whether SYS.SYSUSERS.PASSWORD is referenced from code-generation time to preprocessing
time. I am running tests now.

I agree with Dag's analysis of the problem. The problem is that we are looking at a referenced
column map which has been altered by the optimizer. The fix is to check the referenced column
map after binding but before optimization.

Touches the following files:


M       java/engine/org/apache/derby/impl/sql/compile/FromBaseTable.java

The fix.


M       java/testing/org/apache/derbyTesting/functionTests/tests/lang/DBOAccessTest.java

New regression test cases, including the repro.

> Can't select from SYS.SYSUSERS if you use a WHERE clause in the query
> ---------------------------------------------------------------------
>                 Key: DERBY-6221
>                 URL: https://issues.apache.org/jira/browse/DERBY-6221
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
>         Attachments: derby-6221-01-aa-checkForPasswordProbeAtPreprocessTime.diff
> The following query runs fine:
> SELECT username, lastmodified FROM sys.sysusers;
> ...but the following query raises an exception:
> SELECT username, lastmodified FROM sys.sysusers WHERE USERNAME = 'FRED';
> ...which is
> ERROR 4251E: No one can view the 'SYSUSERS'.'PASSWORD' column.

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