Julie Tibshirani created LUCENE-8287:
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Summary: ContextQuery with empty RegexCompletionQuery produces an
assertion failure
Key: LUCENE-8287
URL: https://issues.apache.org/jira/browse/LUCENE-8287
Project: Lucene - Core
Issue Type: Bug
Reporter: Julie Tibshirani
When an empty RegexCompletionQuery is provided to ContextQuery, the following
assertion failure occurs:
{code:java}
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)
{code}
This is a bit of an edge case, but may be concerning as 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.
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