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 


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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