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https://issues.apache.org/jira/browse/LUCENE-1478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668822#action_12668822
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Uwe Schindler commented on LUCENE-1478:
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Ah, now I understand (by the way, I do not understand Solrs ExternalFileField
in complete, too):
With my workaround, I did not want to work around the problem of a changed
external file. I propsed, not to implement a own FieldCache for the whole thing
and just use the new SortField's parser to fill the standard FloatCache during
searching/filtering. Just use the external (static) file and convert the the
values from the index using the HashMap in ExternalFileField to the floats.
This parser is a singleton for each ExternalFileField.
But I think we should wait, until Yonik explains us the problem more detail.
> Missing possibility to supply custom FieldParser when sorting search results
> ----------------------------------------------------------------------------
>
> Key: LUCENE-1478
> URL: https://issues.apache.org/jira/browse/LUCENE-1478
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.4
> Reporter: Uwe Schindler
> Assignee: Michael McCandless
> Fix For: 2.9
>
> Attachments: LUCENE-1478-cleanup.patch,
> LUCENE-1478-no-superinterface.patch, LUCENE-1478.patch, LUCENE-1478.patch,
> LUCENE-1478.patch, LUCENE-1478.patch, LUCENE-1478.patch
>
>
> When implementing the new TrieRangeQuery for contrib (LUCENE-1470), I was
> confronted by the problem that the special trie-encoded values (which are
> longs in a special encoding) cannot be sorted by Searcher.search() and
> SortField. The problem is: If you use SortField.LONG, you get
> NumberFormatExceptions. The trie encoded values may be sorted using
> SortField.String (as the encoding is in such a way, that they are sortable as
> Strings), but this is very memory ineffective.
> ExtendedFieldCache gives the possibility to specify a custom LongParser when
> retrieving the cached values. But you cannot use this during searching,
> because there is no possibility to supply this custom LongParser to the
> SortField.
> I propose a change in the sort classes:
> Include a pointer to the parser instance to be used in SortField (if not
> given use the default). My idea is to create a SortField using a new
> constructor
> {code}SortField(String field, int type, Object parser, boolean reverse){code}
> The parser is "object" because all current parsers have no super-interface.
> The ideal solution would be to have:
> {code}SortField(String field, int type, FieldCache.Parser parser, boolean
> reverse){code}
> and FieldCache.Parser is a super-interface (just empty, more like a
> marker-interface) of all other parsers (like LongParser...). The sort
> implementation then must be changed to respect the given parser (if not
> NULL), else use the default FieldCache.getXXXX without parser.
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