andywebb1975 opened a new pull request, #2488:
URL: https://github.com/apache/solr/pull/2488
_work in progress!_ If anyone sees this and has thoughts on it, please
comment below :-)
# Description
We were surprised by `edismax`'s behaviour for pure-stopword queries, having
expected that these would return zero results. Its _'If a query consists of all
stopwords, such as "to be or not to be", then all words are required.'_
behaviour is the opposite to what we want as we're using query-time stopwords
to prevent particular query terms matching, but there's no way to disable the
behaviour other than using `dismax` instead, which may have other impacts.
# Solution
This PR adds an `alwaysStopwords` option that disables the default
behaviour. Its name is TBD.
I've noticed that the query plan becomes `+()` rather than
`MatchNoDocsQuery("")` for pure-stopword queries, also when the query contains
only tokenising characters (e.g. punctuation). Does this make any difference?
# Tests
_TO DO!_
# Checklist
Please review the following and check all that apply:
- [ ] I have reviewed the guidelines for [How to
Contribute](https://github.com/apache/solr/blob/main/CONTRIBUTING.md) and my
code conforms to the standards described there to the best of my ability.
- [ ] I have created a Jira issue and added the issue ID to my pull request
title.
- [ ] I have given Solr maintainers
[access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
to contribute to my PR branch. (optional but recommended)
- [ ] I have developed this patch against the `main` branch.
- [ ] I have run `./gradlew check`.
- [ ] I have added tests for my changes.
- [ ] I have added documentation for the [Reference
Guide](https://github.com/apache/solr/tree/main/solr/solr-ref-guide)
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