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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3310) ASSERT in MergeSort.checkColumnTypes() disallow legal type conversions
Date Fri, 22 Feb 2008 22:43:19 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571624#action_12571624
] 

Daniel John Debrunner commented on DERBY-3310:
----------------------------------------------

> Do you think this is a sufficient incremental improvement to resolve the regression?


In my opinion not at the moment, I'm uncomfortable with fixes that can't be explained. At
the moment it's a case
of :
   - if I do this then it appears to work but I don't know why.

It's good that you've found the likely source of the problem, but it's just a starting point.
I'll spend some time trying to understand what that method is trying to do, it probably has
to
do with some comments in ResultSetNode.genNormalizeResultSetNode:

  	 * Put a NormalizeResultSetNode on top of the specified ResultSetNode.
	 * ColumnReferences must continue to point to the same ResultColumn, so
	 * that ResultColumn must percolate up to the new PRN.

Not sure what that means exactly, but it seems related.



> ASSERT in MergeSort.checkColumnTypes() disallow legal type conversions
> ----------------------------------------------------------------------
>
>                 Key: DERBY-3310
>                 URL: https://issues.apache.org/jira/browse/DERBY-3310
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.0.0
>            Reporter: Dyre Tjeldvoll
>            Assignee: Kathey Marsden
>            Priority: Minor
>         Attachments: cast-repro.sql, derby-3310_try1_diff.txt
>
>
> The following code 
> CREATE TABLE U (SNAME VARCHAR(32000), TNAME VARCHAR(32000), C1 BIGINT);
> -- This triggers an ASSERT (because 2 is INTEGER and not BIGINT)
> INSERT INTO U(SNAME, TNAME, C1) SELECT DISTINCT SCHEMANAME, TABLENAME, 2
>  FROM SYS.SYSTABLES T JOIN SYS.SYSSCHEMAS S ON T.SCHEMAID = S.SCHEMAID;
> gives
> ERROR XJ001: Java exception: 'ASSERT FAILED col1.getClass() (class org.apache.derby.iapi.types.SQLInteger)
expected to be the same as col2.getClass() (class org.apache.derby.iapi.types.SQLLongint):
org.apache.derby.shared.common.sanity.AssertFailure'.

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