Mike Drob created ACCUMULO-1801:
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Summary: 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
Priority: Minor
Fix For: 1.5.1, 1.6.0
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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