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Date: Thu, 11 May 2006 12:13:06 +0000 (GMT+00:00)
From: "Andreas Korneliussen (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-1276) Calling ResultSet.isLast() on a
 scrollable insensitive resultset, causes the entire ResultSet to be
 populated
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     [ http://issues.apache.org/jira/browse/DERBY-1276?page=all ]

Andreas Korneliussen updated DERBY-1276:
----------------------------------------

    Attachment: derbyall_report.txt

Uloading result of derbyall. Test failed in OnlineBackup, do not see that it could be related to the patch.

> Calling ResultSet.isLast() on a scrollable insensitive resultset, causes the entire ResultSet to be populated
> -------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-1276
>          URL: http://issues.apache.org/jira/browse/DERBY-1276
>      Project: Derby
>         Type: Improvement

>   Components: SQL
>     Versions: 10.2.0.0, 10.1.3.0
>     Reporter: Andreas Korneliussen
>     Assignee: Andreas Korneliussen
>     Priority: Minor
>  Attachments: DERBY-1276.diff, DERBY-1276.stat, derbyall_report.txt
>
> The following is not a bug, however some applications do not always need to scroll to the last row, however they do want to check isLast(). Therefore it is unfortunate that isLast() is expensive. The general logic in ScrollInsensitiveResultSet is to populate rows by demand.
> The current logic in ScrollInsensitiveResultSet to return true or false on isLast(), is to move to the last row. If the last row is not the same row number as the current, then isLast() returns false. When moving to the last row, all rows will be populated into the BackingStoreHashtable of the ScrollInsensitiveResultSet.
> This logic may be rewritten to only move to the next row. If the next row exists, isLast() may return false.
> (note the logic is also optimized to use beforeFirst and afterLast flags)

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