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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1701) Add NumericField and NumericSortField, make plain text numeric parsers public in FieldCache, move trie parsers to FieldCache
Date Fri, 19 Jun 2009 20:18:07 GMT


Michael McCandless commented on LUCENE-1701:

I still think we should make NumericSortField strongly typed (not a
factory method that returns a SortField w/ the right parser).

I think it's far more consumable, from the user's standpoint. I made
a NumericField when indexing so making a NumericSortField to sort
makes it "obvious".

Ie this:
new NumericSortField("price");

is better than this:
new SortField("price", FieldCache.NUMERIC_FLOAT_PARSER);

or this:
SortField.getNumericSortField("price", SortField.FLOAT);

Uwe, I agree that if we take the developer's (us) standpoint, the
implementation of NumericSortField is so trivial (just pick the right
parser) that it's tempting to not name the class.  But from the user's
standpoint it's less consumable.

bq. Regardless of the fact that plain_int parser is on FieldCache, it still doesn't seem like
we should add parsers to FieldCache for every field type.

{Extended,}FieldCache already is the central place that holds parsers
for all of Lucene's core types; why change that?  Leaving Numeric* out
is dangerous because then people will naturally assume getFloats() is
the method to call.

> Add NumericField and NumericSortField, make plain text numeric parsers public in FieldCache,
move trie parsers to FieldCache
> ----------------------------------------------------------------------------------------------------------------------------
>                 Key: LUCENE-1701
>                 URL:
>             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:
> 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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