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https://issues.apache.org/jira/browse/ACCUMULO-3905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14601818#comment-14601818
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Christopher Tubbs commented on ACCUMULO-3905:
---------------------------------------------
After talking with Keith, it looks like this solution still has one limitation:
there's no way for the {{RowDeletingIterator}} (or a similar iterator) to add
an additional whole column family, if a user called {{fetchColumns}} with a
specific qualifier in that family.
So, if the user originally fetched:
{code}
cf1:cq1
cf2
{code}
the system iterator won't be able to tell if cf1 was added from another
iterator... because it would have already been in the set of column families in
the seek. The only logical assumption the system iterator can make is that it
was part of the original request and it must therefore filter on {{cq1}} within
{{cf1}}
The impact on the {{RowDeletingIterator}} is that users shouldn't use it and
also use {{fetchColumns}} with any {{cf:cq}} pair where {{cf}} is empty. In
fact, I'd recommend not using an empty {{cf}} for any columns other than the
delete marker.
This limitation makes ACCUMULO-3906 even more important. {{fetchColumns}} just
isn't maintainable in the long-term if we want the iterator stack to be
flexible enough to support these kinds of use cases.
> RowDeletingIterator does not work if columns are specified
> ----------------------------------------------------------
>
> Key: ACCUMULO-3905
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3905
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Affects Versions: 1.5.0, 1.6.0
> Reporter: Eric Newton
> Assignee: Keith Turner
> Fix For: 1.8.0
>
>
> (from the mailing list):
> {quote}
> It seem that there might be a bug in RowDeletingIterator:
> after using RowDeletingIterator I get expected results when querying by rowId
> and CF, e.g.
> scan \-b myrowid \-c field/abc \-t table <---- doesn't return deleted rows
> as expected
> however if I add column qualified to the query, I see deleted items.
> scan \-b myrowid \-c field/abc:sample_qualifier \-t table <-- returns
> deleted rows
> After major compaction the problem goes away.
> {quote}
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