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Date: Fri, 22 Feb 2008 15:19:19 -0800 (PST)
From: "Daniel John Debrunner (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-3310) ASSERT in
 MergeSort.checkColumnTypes() disallow legal type conversions
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    [ https://issues.apache.org/jira/browse/DERBY-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571637#action_12571637 ] 

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

[more rambling]
The pattern of modifying the node being wrapped when wrapping it seems a common theme in ResultSetNode:

  genProjectRestrictForReordering & genProjectRestrict also do it.

Have to say it's a very counter-intuitive coding style and likely to lead to bugs.

> 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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