[jira] [Commented] (ACCUMULO-1801) Create a SelectColumnsIterator

["Keith Turner (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ACCUMULO-1801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14606263#comment-14606263 ] 

Keith Turner commented on ACCUMULO-1801:
----------------------------------------

I added a patch to ACCUMULO-3905 update the javadoc for fetchColumns.  I'm thinking once this issue is done we should deprecate fetchColumns and recommend using the iterator.

> Create a SelectColumnsIterator
> ------------------------------
>
>                 Key: ACCUMULO-1801
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1801
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client
>            Reporter: Mike Drob
>            Assignee: Christopher Tubbs
>            Priority: Minor
>             Fix For: 1.8.0
>
>
> A user can already limit columns on a scanner, however there is not an easy way to limit the columns propagated in the middle of an iterator stack. For example, if a user has data like the following:
> {noformat}
> user-1 age:25
> user-1 occupation:Student
> user-2 age:45
> user-2 occupation:Engineer
> {noformat}
> and wants to get only the users that are younger than 30, it is easy to write a custom {{RowFilter}} to do that.
> However, to get only the occupation of users under 30, there would need to be additional filtering done on the client side. If the rows get large or particularly numerous, then this becomes undesirable. And setting the fetch columns is not an option since that would hide the age column from the {{RowFilter}}.



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