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https://issues.apache.org/jira/browse/ACCUMULO-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890624#comment-13890624
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Corey Nolet commented on ACCUMULO-2178:
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[~vickyeuc], I think the important difference here is the ability to seek
directly from the end of one range to the beginning of another.
> ColumnFamilyRangeIterator
> -------------------------
>
> Key: ACCUMULO-2178
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2178
> Project: Accumulo
> Issue Type: Improvement
> Reporter: Corey J. Nolet
> Priority: Minor
>
> It would be extremely useful in situations where you would like to specify a
> range of rows to iterate and also a range of column families within that
> range of rows. The current API requires that you specify a start/end key for
> each row that you will be scanning in the range of column families.
> There would be a lot gained from the ability to first seek to the beginning
> column specified in the range of columns, return all keys/values inside of
> that range, and then seek to the beginning of the range for the following row
> when the ending column family in the current row has been reached.
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