[jira] [Commented] (LUCENE-3065) NumericField should be stored in binary format in index (matching Solr's format)

["Uwe Schindler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-3065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028354#comment-13028354 ] 

Uwe Schindler commented on LUCENE-3065:
---------------------------------------

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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