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  1. Lucene - Core
  2. LUCENE-2068

fix reverseStringFilter for unicode 4.0

    XMLWordPrintableJSON

Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • None
    • 4.0-ALPHA
    • modules/analysis
    • None
    • New, Patch Available

    Description

      ReverseStringFilter is not aware of supplementary characters: when it reverses it will create unpaired surrogates, which will be replaced by U+FFFD by the indexer (but not at query time).
      The wrong words will conflate to each other, and the right words won't match, basically the whole thing falls apart.

      This patch implements in-place reverse with the algorithm from apache harmony AbstractStringBuilder.reverse0()

      Attachments

        1. LUCENE_2068.patch
          13 kB
          Simon Willnauer
        2. LUCENE-2068.patch
          13 kB
          Robert Muir
        3. LUCENE_2068.patch
          6 kB
          Simon Willnauer
        4. LUCENE_2068.patch
          6 kB
          Simon Willnauer
        5. LUCENE-2068.patch
          5 kB
          Robert Muir

        Issue Links

          is part of

          Improvement - An improvement or enhancement to an existing feature or task. LUCENE-1689 supplementary character handling

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Activity

            People

              simonw Simon Willnauer
              rcmuir Robert Muir
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              Dates

                Created:
                Updated:
                Resolved: