Missing possibility to supply custom FieldParser when sorting search results
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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
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" bcause all 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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