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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-697) Break Scanner parameterization from Key,Value to Key,{Something}
Date Fri, 07 Sep 2012 01:14:09 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christopher Tubbs updated ACCUMULO-697:
---------------------------------------

    Affects Version/s:     (was: 1.5.0)
    
> Break Scanner parameterization from Key,Value to Key,{Something}
> ----------------------------------------------------------------
>
>                 Key: ACCUMULO-697
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-697
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>
> When writing a custom iterator, many times the iterator has some semantic knowledge of
what each Key/Value being returned actually means (e.g. A word count could be returning Key/Value
but really is returning an Integer/Long count in the Value). This forces the client to know
what is going to be returned and handle the cast/transformation.
> I believe it should be fairly straightforward to encapsulate this transformation inside
the Accumulo client code. I plan on investigating the possibility of changing the ScannerBase
impl, or perhaps making a TypedScannerBase, in which the iterator at the "top" of the stack
for a scan can return something other than a Value to the client.

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