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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
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Alex Baranau commented on HBASE-4364:
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@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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