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https://issues.apache.org/jira/browse/HBASE-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150091#comment-13150091
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Lars Hofhansl commented on HBASE-4256:
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What about the other points? Are we seeing this as:
1. A way to scan subset of many rows (would be inefficient as we need to reseek
at the beginning of every new row)?
or
2. A scan strictly within a single row? (should enforce start/endRow set to the
same value in this case.)
or
3. More control where to start and stop a scan? (leave the scan logic mostly
the way it is, and allow a way to seek to a column of a row, and end at a
different column in another row).
#1 makes no sense (to me anyway, but maybe there's something I didn't see).
#3 is a superset of #2. As described above, in this case we could start at
RowX:QualA and scan to RowY:QualB, all rows between RowX and RowY would scan
all Quals. Can be combined easily with timerange scans.
I'd be in favor of #3. Or #2 if it turns out to be less work.
> 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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