Github user rmuir commented on the issue:
https://github.com/apache/lucene-solr/pull/375
{quote}
When PrefixCompletionQuery has an empty term, its automaton is actually *
-- maybe we could look into adding a fix/ optimization there in a follow-up.
{quote}
Regexp query should handle that case fine though. It uses
Operations.isEmpty (see the CompiledAutomaton class) to detect that the
automation accepts no strings. The logic here is different and a subset of
that, and I think thats why there might be such cases.
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