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https://issues.apache.org/jira/browse/ACCUMULO-697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421523#comment-13421523
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David Medinets commented on ACCUMULO-697:
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What is K and V? Where are they defined? I know they mean key and value but I'd
like to grok the fundamentals. Sorry for this basic question, and pardon me for
asking it here, but I don't know what kind of web search would give me an
answer.
> 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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