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From "Ferdy Galema (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GORA-119) implement a filter enabled scan in gora
Date Thu, 26 Apr 2012 17:22:17 GMT

    [ https://issues.apache.org/jira/browse/GORA-119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13262757#comment-13262757
] 

Ferdy Galema commented on GORA-119:
-----------------------------------

Hey Keith,

I like your idea about QueryOptimizer! I was struggling a bit on my own about how to cleanly
design the filter interface so that the optimization is coupled with the implementation of
the filter itself. Your suggestion exactly does that! And indeed has the additional benefit
of allowing users to implement optimizers for their own filters. Only thing is that when implementing
a QueryOptimizer, a user might not want to be bothered with implementing the generic non-optimized
variant. (Not that it matters much, they could leave it empty of course since it is a locally
implemented filter). A slightly bigger issue is that the Gora-supplied filters have knowledge
about stores. (Dependency inversion?). But then again we could simply leave the optimization
empty so that is up to each store to implement optimizations for those filters.

About the list of filters, this can easily be implemented with a Gora-supplied filter that
accepts a list with optional an operater (i.e. AND, OR).

Thanks.
                
> implement a filter enabled scan in gora
> ---------------------------------------
>
>                 Key: GORA-119
>                 URL: https://issues.apache.org/jira/browse/GORA-119
>             Project: Apache Gora
>          Issue Type: Improvement
>    Affects Versions: 0.2
>         Environment: gora hbase gora-core gora-hbase
>            Reporter: raf shin
>              Labels: filter, gora-core, gora-hbase, scan
>             Fix For: 0.3
>
>         Attachments: GORA-119-v1.txt
>
>
> it'll be very of help to implement a filtered scan to reduce the time of scan in gora-core
and gora-hbase components.

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