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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CONNECTORS-110) Max activity and Max bandwidth reports don't work properly under Derby
Date Sat, 02 Apr 2011 11:58:05 GMT

     [ https://issues.apache.org/jira/browse/CONNECTORS-110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karl Wright updated CONNECTORS-110:
-----------------------------------

    Summary: Max activity and Max bandwidth reports don't work properly under Derby  (was:
Max activity and Max bandwidth reports fail under Derby with a stack trace)

> Max activity and Max bandwidth reports don't work properly under Derby
> ----------------------------------------------------------------------
>
>                 Key: CONNECTORS-110
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-110
>             Project: ManifoldCF
>          Issue Type: Bug
>          Components: Framework crawler agent
>            Reporter: Karl Wright
>
> The reason for the failure is because the queries used are doing the Postgresql DISTINCT
ON (xxx) syntax, which Derby does not support.  Unfortunately, there does not seem to be a
way in Derby at present to do anything similar to DISTINCT ON (xxx), and the queries really
can't be done without that.
> One option is to introduce a getCapabilities() method into the database implementation,
which would allow ACF to query the database capabilities before even presenting the report
in the navigation menu in the UI.  Another alternative is to do a sizable chunk of resultset
processing within ACF, which would require not only the DISTINCT ON() implementation, but
also the enclosing sort and limit stuff.  It's the latter that would be most challenging,
because of the difficulties with i18n etc.

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