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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6310) NLS SESSION SORT
Date Mon, 19 Aug 2013 12:27:48 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13743769#comment-13743769
] 

Rick Hillegas commented on DERBY-6310:
--------------------------------------

Hi Sebastian,

That is a big data set. Note that ForeighTableVTI implements RestrictedVTI. That means that
projections (limiting which columns are selected) and restrictions (limiting which rows are
selected) are pushed into the table function. That can vastly reduce the size of the data
rectangle returned by ForeignTableVTI and therefore the amount of data which has to be thrown
into the sorter. 

Thanks,
-Rick
                
> NLS SESSION SORT
> ----------------
>
>                 Key: DERBY-6310
>                 URL: https://issues.apache.org/jira/browse/DERBY-6310
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.8.2.2
>         Environment: Java 1.6 / 1.7, Derby 10.8.2.2
>            Reporter: Sebastian Ritter
>
> Migrating from Oracle missing SQL Statement:
> ALTER SESSION SET NLS_SORT=binary

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