[jira] [Commented] (SOLR-12879) Query Parser for MinHash/LSH

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[jira] [Commented] (SOLR-12879) Query Parser for MinHash/LSH

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    [ https://issues.apache.org/jira/browse/SOLR-12879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16659170#comment-16659170 ]

Christine Poerschke commented on SOLR-12879:

Late to the party here. Hello.

* Would it be possible to backport to branch_7x too? LUCENE-6968 mentioned above appears to be in 7.0 but perhaps there are other dependencies? During the Lucene Hackday in Montreal [~andyhind] explained a little on what this logic is about and I think this could be of interest to folks on the upcoming 7.6 release too.

* Is the intended use case for this query parser primarily direct e.g. via the {{q}} and {{fq}} parameters or indirect somehow e.g. via streaming expressions? If the use case is direct:
** the parser could potentially be given a default name of (say) {{minhash}} and included in the standard plugins i.e. https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.5.0/solr/core/src/java/org/apache/solr/search/QParserPlugin.java#L46
*** Users (and tests) would not need to configure {{<queryParser name="minhash" class="org.apache.solr.search.MinHashQParserPlugin" />}} then.
** the parser could be included in the Solr Reference Guide e.g. the http://lucene.apache.org/solr/guide/7_5/other-parsers.html section which is https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.5.0/solr/solr-ref-guide/src/other-parsers.adoc in version control.

* The solr/CHANGES.txt entry lacks the customary attribution, just an oversight I'm sure and easily fixed.

> Query Parser for MinHash/LSH
> ----------------------------
>                 Key: SOLR-12879
>                 URL: https://issues.apache.org/jira/browse/SOLR-12879
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public)
>          Components: query parsers
>    Affects Versions: master (8.0)
>            Reporter: Andy Hind
>            Assignee: Tommaso Teofili
>            Priority: Major
>             Fix For: master (8.0)
>         Attachments: minhash.patch
> Following on from https://issues.apache.org/jira/browse/LUCENE-6968, provide a query parser that builds queries that provide a measure of Jaccard similarity. The initial patch includes banded queries that were also proposed on the original issue.
> I have one outstanding questions:
>  * Should the score from the overall query be normalised?
> Note, that the band count is currently approximate and may be one less than in practise.

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