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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1701) Add NumericField and NumericSortField, make plain text numeric parsers public in FieldCache, move trie parsers to FieldCache
Date Mon, 22 Jun 2009 15:29:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722639#action_12722639
] 

Michael McCandless commented on LUCENE-1701:
--------------------------------------------


bq. You cannot do this with NumberTools.

Whoa! Sorry, you are right.  Nothing in FieldCache can handle decoding
this encoding into short/byte; so you'd need something outside of
Lucene's core, today, to do that.

Though it does allow you to do RangeQuery, with short/byte, and you
could sort as SortField.STRING, (quite hideously memory inefficient).

So I now agree: we should deprecate NumberTools entirely, now.

If people ask how to handle short/byte beforew we resolve LUCENE-1710,
the answer is to upgrade everything to int.  The resulting wasteful
int[] that'd be in the FieldCache is not nearly as wasteful as the
String[] you'd need to use to do sorting, today.  And you could always
make a custom parser using NumericUtils that downcasts to byte/short,
anyway, since the needed APIs are public.


> 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,
LUCENE-1701.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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