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From "Lance Norskog (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1918) Bit-wise scoring field type
Date Wed, 19 May 2010 02:24:53 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868962#action_12868962
] 

Lance Norskog commented on SOLR-1918:
-------------------------------------

I can't quite follow the patch. Does this do scoring from the Hamming distance?

> Bit-wise scoring field type
> ---------------------------
>
>                 Key: SOLR-1918
>                 URL: https://issues.apache.org/jira/browse/SOLR-1918
>             Project: Solr
>          Issue Type: New Feature
>          Components: Schema and Analysis
>    Affects Versions: 3.1
>            Reporter: Andrzej Bialecki 
>         Attachments: bitwise.patch
>
>
> This field type supports bit-wise matching with scoring over fields containing 32-bit
integer values.
> Internally during indexing the field value is interpreted as a 32-bit integer and converted
to a set of bitmask terms. During search the query term is also converted into a BooleanQuery
of corresponding bitmask terms, added as Occur.SHOULD clauses. The scoring of such query over
such field produces the desired effect, where bit patterns closest to the query get highest
scores.
> NOTE: currently only single value per field, a future extension will support multiple
values.
> The difference between this issue and SOLR-1913 is that SOLR-1913 offers filtering only
(no scoring), while this implementation performs scoring, which allows finding the best matching
inexact bit patterns. This has applications in e.g. near-duplicate detection.

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