Github user jtibshirani commented on the issue:
https://github.com/apache/lucene-solr/pull/375
I'm sorry for the confusion -- I didn't mean complete parity with
`RegexpQuery`, as they are different queries with different behaviors, but
rather consistency how they treat an empty regex. After thinking more I now see
your point, it makes a lot more sense to describe it as consistency with
`PrefixCompletionQuery`!
I've made the following changes:
- Replaced references to 'parity with `RegexpQuery`' to 'consistency with
`PrefixCompletionQuery`, as this is more accurate.
- Added an optimization to `ContextQuery#createWeight` that returns an
empty automaton if the inner weight is empty. Note that this optimization only
helps with `RegexCompletionQuery`. When `PrefixCompletionQuery` contains an
empty term, its automaton is actually `*` -- maybe we could look into adding an
optimization there in a follow-up.
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