[jira] [Created] (LUCENE-8288) ContextQuery "." for RegexCompletionQuery produces an assertion failure

["Julie Tibshirani (JIRA)" <ji...@apache.org>]

Julie Tibshirani created LUCENE-8288:
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             Summary: ContextQuery "." for RegexCompletionQuery produces an assertion failure
                 Key: LUCENE-8288
                 URL: https://issues.apache.org/jira/browse/LUCENE-8288
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Julie Tibshirani


When a RegexCompletionQuery of "." is provided to ContextQuery, the following assertion failure occurs:
{code:java}
java.lang.AssertionError: input should not end with a context separator followed by SEP_LABEL

at org.apache.lucene.search.suggest.document.ContextQuery$ContextCompletionWeight.setInnerWeight(ContextQuery.java:299)
at org.apache.lucene.search.suggest.document.ContextQuery$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.testDotRegexQuery(TestContextQuery.java:188)

{code}
Note that this is a related, but distinct issue from https://issues.apache.org/jira/browse/LUCENE-8287, where the RegexCompletionQuery is empty.

The attached patch provides a reproduction of the issue, as the test case TestContextQuery#testRegexDotQuery. 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#testRegexDotQuery). In this case, there is no error, and all suggestions are returned.

From a quick look, it seems as though "." doesn't capture any characters past  CompletionAnalyzer.SEP_LABEL, so the matching prefix in ContextCompletionWeight#setInnerWeight is unexpectedly empty.



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