Lucene - Core
  1. Lucene - Core
  2. LUCENE-1478

Missing possibility to supply custom FieldParser when sorting search results


    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 2.4
    • Fix Version/s: 2.9
    • Component/s: core/search
    • Labels:
    • Lucene Fields:
      New, Patch Available


      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 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

      SortField(String field, int type, Object parser, boolean reverse)

      The parser is "object" because all current parsers have no super-interface. The ideal solution would be to have:

      SortField(String field, int type, FieldCache.Parser parser, boolean reverse)

      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.

      1. LUCENE-1478-no-superinterface.patch
        13 kB
        Uwe Schindler
      2. LUCENE-1478.patch
        31 kB
        Uwe Schindler
      3. LUCENE-1478.patch
        31 kB
        Uwe Schindler
      4. LUCENE-1478.patch
        32 kB
        Uwe Schindler
      5. LUCENE-1478.patch
        34 kB
        Michael McCandless
      6. LUCENE-1478.patch
        37 kB
        Michael McCandless
      7. LUCENE-1478-cleanup.patch
        3 kB
        Uwe Schindler

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            • Assignee:
              Michael McCandless
              Uwe Schindler
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