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https://issues.apache.org/jira/browse/LUCENE-1701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722257#action_12722257
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Yonik Seeley commented on LUCENE-1701:
--------------------------------------

I'll quote myself, and then attempt to not repeat myself further after this 
point (the back and forth is silly).
bq. The next step after adding NumericField seems to be "it's a bug if 
getDocument() doesn't return a NumericField, so we must encode it in the 
index". If that's the case, I'm -1 on adding NumericField in the first place.

Everyone thinks good APIs, good architecture, and good performance is 
important.  It imply otherwise is also silly.

> Add NumericField and NumericSortField, make plain text numeric parsers public 
> in FieldCache, move trie parsers to FieldCache
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1701
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1701
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index, Search
>    Affects Versions: 2.9
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 2.9
>
>         Attachments: LUCENE-1701-test-tag-special.patch, LUCENE-1701.patch, 
> LUCENE-1701.patch, NumericField.java
>
>
> In discussions about LUCENE-1673, Mike & me wanted to add a new NumericField 
> to o.a.l.document specific for easy indexing. An alternative would be to add 
> a NumericUtils.newXxxField() factory, that creates a preconfigured Field 
> instance with norms and tf off, optionally a stored text (LUCENE-1699) and 
> the TokenStream already initialized. On the other hand 
> NumericUtils.newXxxSortField could be moved to NumericSortField.
> I and Yonik tend to use the factory for both, Mike tends to create the new 
> classes.
> Also the parsers for string-formatted numerics are not public in FieldCache. 
> As the new SortField API (LUCENE-1478) makes it possible to support a parser 
> in SortField instantiation, it would be good to have the static parsers in 
> FieldCache public available. SortField would init its member variable to them 
> (instead of NULL), so making code a lot easier (FieldComparator has this ugly 
> null checks when retrieving values from the cache).
> Moving the Trie parsers also as static instances into FieldCache would make 
> the code cleaner and we would be able to hide the "hack" 
> StopFillCacheException by making it private to FieldCache (currently its 
> public because NumericUtils is in o.a.l.util).

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