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Date: Fri, 17 Aug 2012 02:13:38 +1100 (NCT)
From: "Alex Baranau (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4364) Filters applied to columns not in
 the selected column list are ignored
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    [ https://issues.apache.org/jira/browse/HBASE-4364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436027#comment-13436027 ] 

Alex Baranau commented on HBASE-4364:
-------------------------------------

@Jie Yeah, seems you are right. The problem I'm referring to is a bit different.

Now that I re-read the issue description I think that two problems could be contradictory:
1. In this issue it is stated that *filters should be applied to the columns not in the selected list*
2. In the problem I'm referring to states that *filters should not be applied to the columns in the selected list*

May be what I'm pointing out with the unit-test is really not a bug, but "designed to be" so? Though it might be not, because it would make scanner to always fetch (physically from the storage) even those columns we are not interested in if filters are added to the scan. Which might add a lot of unnecessary work (currently - when data is in different columnfamilies, or in future for same CF if the storage format will be improved somehow that will allow avoid reading columns that are not requested from single CF). I'd say it may be better to require users to specify explicitly columns to which the filters should be applied iff they are not in the selected list. In case of SingleColumnValueFilter, we may say that user specifies the column explicitly. I.e. we should also have ability, (or do we already?) for filter to add a column to that "apply filter to but not transfer to the user" column list.
                
> Filters applied to columns not in the selected column list are ignored
> ----------------------------------------------------------------------
>
>                 Key: HBASE-4364
>                 URL: https://issues.apache.org/jira/browse/HBASE-4364
>             Project: HBase
>          Issue Type: Bug
>          Components: filters
>    Affects Versions: 0.90.4, 0.92.0, 0.94.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>         Attachments: HBASE-4364-failing-test-with-simplest-custom-filter.patch, hbase-4364_trunk.patch, hbase-4364_trunk-v2.patch
>
>
> For a scan, if you select some set of columns using addColumns(), and then apply a SingleColumnValueFilter that restricts the results based on some other columns which aren't selected, then those filter conditions are ignored.

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