Josh Elser created ACCUMULO-697:
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Summary: 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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