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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (DERBY-4720) Allow boolean-valued expressions in select lists
Date Mon, 28 Jun 2010 19:55:50 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas reassigned DERBY-4720:

    Assignee: Rick Hillegas

> Allow boolean-valued expressions in select lists
> ------------------------------------------------
>                 Key: DERBY-4720
>                 URL: https://issues.apache.org/jira/browse/DERBY-4720
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions:
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
> When the BOOLEAN datatype was disabled, the grammar was peppered with special checks
to make sure that expressions like "a > 10" did not appear in the SELECT list. Perhaps
this was done to reduce the number of cases in which BOOLEAN values could be materialized
as columns in queries. That is, however, an unsatisfying reason because you could always materialize
BOOLEAN columns by selecting from certain system tables. In any event, the SQL grammar allows
these expressions in the SELECT list and we should re-enable them as part of exposing BOOLEAN
as a full-fledged Derby datatype.
> I intend to re-enable these expressions per the SQL spec. If anyone knows of a reason
why this should not be allowed, please speak up. Thanks.

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