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https://issues.apache.org/jira/browse/LUCENE-3065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028354#comment-13028354
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Uwe Schindler commented on LUCENE-3065:
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Ideally this could be done with the schema-like approach of one of the GSoC
projects?
We already discussed about that: We can use the FieldsReader/FieldsWriter type
flag (which currently says, binary/text and compressed (unused now)) in the
index file format to mark a field as NumericField. In that case,
Document.getField() would return the NumericField instance.
For Lucene backwards we should still support creating "text-only" fields.
The new binary format would also be compatible with solr, as on getField, Solr
would get a NumericField and can decide using instanceof what to do. Old Solr
indexes without the NumericField marker flag would return as byte[], in which
case, solr would do the decoding.
For storing on index side, Solr could move to NumericField completely (I dont
like the current approach using NumericTokenStream and to/fromInternal wrappers
around conventional Field).
> NumericField should be stored in binary format in index (matching Solr's
> format)
> --------------------------------------------------------------------------------
>
> Key: LUCENE-3065
> URL: https://issues.apache.org/jira/browse/LUCENE-3065
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Reporter: Michael McCandless
> Priority: Minor
> Fix For: 3.2, 4.0
>
>
> (Spinoff of LUCENE-3001)
> Today when writing stored fields we don't record that the field was a
> NumericField, and so at IndexReader time you get back an "ordinary" Field and
> your number has turned into a string. See
> https://issues.apache.org/jira/browse/LUCENE-1701?focusedCommentId=12721972&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12721972
> We have spare bits already in stored fields, so, we should use one to record
> that the field is numeric, and then encode the numeric field in Solr's
> more-compact binary format.
> A nice side-effect is we fix the long standing issue that you don't get a
> NumericField back when loading your document.
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