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From "Vikas Saurabh (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-3352) Expose Lucene search score explanation
Date Wed, 02 Dec 2015 02:45:11 GMT

     [ https://issues.apache.org/jira/browse/OAK-3352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Vikas Saurabh updated OAK-3352:
    Attachment: OAK-3352.patch

Attaching [patch|^OAK-3352.patch]. The patch parses query same as {{rep:excerpt()}} does (i.e.
simple String.contains() in filter) - I'm not sure if this is fine or we should put it in
as a flag in filter as Chetan suggested in his proposal.
Column name used is oak:explainScore although I think something of the form oak:explainScore*()*
might be better (parentheses to give better sense that this is not a property name).

In absence of a better idea, the test case just checks if results contains {{(MATCH)}} as
a couple of explanations that I saw had this string in the explanation.

BTW, [IndexSearcher.explain|https://lucene.apache.org/core/4_6_0/core/org/apache/lucene/search/IndexSearcher.html#explain%28org.apache.lucene.search.Query,%20int%29]
suggests that calculating score can be slow for performance - so, we should specify it clearly
in documentation too.

[~chetanm], [~teofili], can you please review it?

> Expose Lucene search score explanation 
> ---------------------------------------
>                 Key: OAK-3352
>                 URL: https://issues.apache.org/jira/browse/OAK-3352
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: lucene, query
>            Reporter: Chetan Mehrotra
>             Fix For: 1.4
>         Attachments: OAK-3352.patch
> Lucene provides {{Explanation}} [1] support to understand how the score for a particular
search result is determined. To enable users to reason out about fulltext search results in
Oak we should expose this information as part of query result
> [1] https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/search/Explanation.html

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