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  1. Lucene - Core
  2. LUCENE-8287

ContextQuery with empty RegexCompletionQuery produces an assertion failure

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 7.4, 8.0
    • Component/s: None
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      When an empty RegexCompletionQuery is provided to ContextQuery, the following assertion failure occurs:

      java.lang.AssertionError: input should not end with the context separator
      at org.apache.lucene.search.suggest.document.ContextQuery$ContextCompletionWeight.setInnerWeight(ContextQuery.java:296)
      at org.apache.lucene.search.suggest.document.ContextQuery$ContextCompletionWeight.setNextMatch(ContextQuery.java:275)
      at org.apache.lucene.search.suggest.document.NRTSuggester.lookup(NRTSuggester.java:221)
      at org.apache.lucene.search.suggest.document.CompletionScorer.score(CompletionScorer.java:70)
      at org.apache.lucene.search.BulkScorer.score(BulkScorer.java:39)
      at org.apache.lucene.search.suggest.document.SuggestIndexSearcher.suggest(SuggestIndexSearcher.java:78)
      at org.apache.lucene.search.suggest.document.SuggestIndexSearcher.suggest(SuggestIndexSearcher.java:58)
      at org.apache.lucene.search.suggest.document.TestContextQuery.testEmptyRegexQuery(TestContextQuery.java:193)
      

      This is a bit of an edge case, but may be concerning since without assertions enabled, you can go on to access IntsRef indices that are out of bounds.

      The attached patch provides a reproduction of the issue, as the test case TestContextQuery#testEmptyRegexQuery. Note that to reproduce, Java assertions must be enabled (as in the default configuration for tests).

      The patch also provides a test case for the normal behavior of an empty RegexCompletionQuery, when it is not wrapped in ContextQuery (TestRegexCompletionQuery#testEmptyRegexQuery). In this case, there is no error, and all suggestions are returned. 

        Attachments

        1. LUCENE-8287.patch
          2 kB
          Julie Tibshirani
        2. LUCENE-8287-repro.patch
          3 kB
          Julie Tibshirani

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              • Assignee:
                Unassigned
                Reporter:
                jtibshirani Julie Tibshirani
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