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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENE-3629) Hide storage details for IndexDocValues inside the codec
Date Mon, 01 Apr 2013 19:25:15 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir resolved LUCENE-3629.
---------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 4.3)
                   4.2
    
> Hide storage details for IndexDocValues inside the codec
> --------------------------------------------------------
>
>                 Key: LUCENE-3629
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3629
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>    Affects Versions: 4.0-ALPHA
>            Reporter: Simon Willnauer
>             Fix For: 4.2
>
>
> Currently ValueType exposes a lot of impl. details about how values are stored. However,
since those are really impl details we should move those into the codec and decide during
indexing which storage variant we are using. (robert convinced me this is the right thing
and we should explore it)
> We can basically reduce the ValuesType to { Bytes, SortedBytes, FixedInts, Floats, VarInts
}. The implementation ie. the codec can decide based on how many unique values and if values
have all the same size what storage variant it should use. For merging we would need some
statistics exposed on the Source ie. how many unique values and if all value have a fixed
size to decide what the target "type" is going to be. 
> This change would make usage of the API a lot easier and less confusing and at the same
time it makes merging and type promotion straight forward since we can decide what type we
promote to without loading the IDV provider to get the actual size and compare it. 

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