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https://issues.apache.org/jira/browse/ACCUMULO-697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419984#comment-13419984
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Josh Elser commented on ACCUMULO-697:
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John, I should have mentioned that the "inspiration" for something like this
came from the TypedValueCombiner. If someone is already instrumenting code to
run in Accumulo (writing an SKVI), I see no reason why to not let them actually
deal in the types which they want, rather than forcing them to deal with
everything in terms of Key/Value.
Adam and Bill definitely hit on a larger issue of how far you can go with such
an idea, but the scope of what I'll attempt here is much smaller than that.
> 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
> Affects Versions: 1.5.0
> 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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