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From "Dave Revell (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4256) Intra-row scanning (part deux)
Date Mon, 14 Nov 2011 20:28:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149878#comment-13149878
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Dave Revell commented on HBASE-4256:
------------------------------------

I've started work on this and I'm having trouble deciding on the best interface. I can see
a couple ways that it might work:

1. Add Scan.setStartQualifier() and Scan.setEndQualifier(). What if the user also uses addColumn(),
would we fetch those columns also?

2. Add Scan.addColumnRange(byte[] start, byte[] end). Could the user specify multiple (possibly
overlapping) ranges? Again, would this conflict with addColumn()?

Any input would be appreciated.
                
> Intra-row scanning (part deux)
> ------------------------------
>
>                 Key: HBASE-4256
>                 URL: https://issues.apache.org/jira/browse/HBASE-4256
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>            Assignee: Dave Revell
>            Priority: Critical
>             Fix For: 0.94.0
>
>
> Dave Revell was asking on IRC today if there's a way to scan ranges of *qualifiers* within
a row. That is, to be able to specify a *start qualifier* and an *end qualifier* so that the
Get or Scan seeks directly to the first qualifier and stops at some point which can be predeterminate
by a qualifier or simply a batch configuration (already exists).
> This is particularly useful for large rows with time-based qualifiers.
> Dave also mentioned that another popular database has such a feature that they call "column
slices".

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