Support for nested queries

[gregsilin]

Thanks for making this library possible!

I'm using it for a project that requries supporting multi-word typeahead sort of query.

Example text:

Mary had a little lamb

Queries such as Mar*, Mary ha*, Mary had a litt*, Mary had a little la* all should match. Fuzzy match not required.

After running into a lot of all dead ends, the approach that I found that worked for me is the one mentioned in this SO article.

public static Query createPhraseQuery(String[] phraseWords, String field) {
    SpanQuery[] queryParts = new SpanQuery[phraseWords.length];
    for (int i = 0; i < phraseWords.length; i++) {
        WildcardQuery wildQuery = new WildcardQuery(new Term(field, phraseWords[i]));
        queryParts[i] = new SpanMultiTermQueryWrapper<WildcardQuery>(wildQuery);
    }
    return new SpanNearQuery(queryParts,       //words
                             0,                //max distance
                             true              //exact order
    );
}

I'd like to contribute a PR to enable SpanQuery support.

What is your requirement for opening PRs, and do you have a preferred approach for handling nested queries? I am asking as I want to keep code consistent with your vision / style (and to limit PR re-works :D).

PR Happy to hear alternative proposals on my original quest - I didn't really find much success with phrase queries or wildcard queries once I went to multiple words with partial match.

[darkfrog26]

I'd welcome a PR. I'd prefer the code style remain consistent, and I might offer some feedback, but I don't hold any hard and fast rules.

[darkfrog26]

@gregsilin, is this something you're still interested in?

[gregsilin]

Hi, yes we would love this! We have a private fork of the above (our company code is not on GitHub) but I haven’t had the chance to open a PR. I can at the very least share the changes.

I’ll try to find time to open a PR in the next couple of weeks

[darkfrog26]

That sounds great. If you haven't noticed, I've been making significant changes and improvements to this project and intend a 1.9 release tomorrow. It doesn't sound like you'll have a PR in time for that, but I'll try to merge and do a new release as soon as you can get me the PR. If you have any other changes, feel free to share them. Lucene is a pain to use, so any assistance is always welcome. ;)