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https://issues.apache.org/jira/browse/HBASE-13346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14383725#comment-14383725
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Anoop Sam John commented on HBASE-13346:
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Regarding FirstKeyOnlyFilter
bq.This filter can be used to more efficiently perform row count operations.
It will be better to return only the key for such cases. Value can be large in
certain cases. We could have used the transform(Cell) for doing that. Wondering
why it was not done. wdyt?
> Clean up Filter package for post 1.0
> ------------------------------------
>
> Key: HBASE-13346
> URL: https://issues.apache.org/jira/browse/HBASE-13346
> Project: HBase
> Issue Type: Bug
> Components: API, Filters
> Affects Versions: 2.0.0
> Reporter: Lars George
> Fix For: 2.0.0
>
>
> Since we have a bit of a messy Filter API with KeyValue vs Cell reference
> mixed up all over the place, I recommend cleaning this up once and for all.
> There should be no {{KeyValue}} (or {{kv}}, {{kvs}} etc.) in any method or
> parameter name.
> This includes deprecating and renaming filters too, for example
> {{FirstKeyOnlyFilter}}, which really should be named {{FirstKeyValueFilter}}
> as it does _not_ just return the key, but the entire cell. It should be
> deprecated and renamed to {{FirstCellFilter}} (or {{FirstColumnFilter}} if
> you prefer).
> In general we should clarify and settle on {{KeyValue}} vs {{Cell}} vs
> {{Column}} in our naming. The latter two are the only ones going forward with
> the public API, and are used synonymous. We should carefully check which is
> better suited (is it really a specific cell, or the newest cell, aka the
> newest column value) and settle on a naming schema.
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