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https://issues.apache.org/jira/browse/DERBY-3310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571629#action_12571629
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Daniel John Debrunner commented on DERBY-3310:
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ResultSetNode.genNormalizeResultSetNode() is a little strange:
Its purpose is to push a normalize result set node on-top of a ResultSetNode.
The passed in child node is always the node is actually invoked on, so it's
always operating on this.
(I'll attach a simple patch for that, it simplifies the code a little,
otherwise it appears the method is operating on
two result set nodes instead of just itself.
What's strange to me is that even though it is wrapping itself with a normalize
node, the code ends up modifying
its own resultColumns. A normal, expected pattern for such a situation is that
the node to be wrapped would
be unmodified by pushing a normalize node on top of it. This could be related
to this issue, the source nodes and
target nodes might be being mixed up.
[sorry if this appears unclear, it's just something I noticed and wanted to
quickly throw out there]
> 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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