[jira] [Created] (OAK-4368) Excerpt extracted from the Lucene index should be more selective

["Tommaso Teofili (JIRA)" <ji...@apache.org>]

Tommaso Teofili created OAK-4368:
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             Summary: Excerpt extracted from the Lucene index should be more selective
                 Key: OAK-4368
                 URL: https://issues.apache.org/jira/browse/OAK-4368
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: lucene
    Affects Versions: 1.5.2, 1.4.2, 1.2.14, 1.0.30
            Reporter: Tommaso Teofili
            Assignee: Tommaso Teofili
             Fix For: 1.5.3


Lucene index can be used in order to extract _rep:excerpt_ using {{Highlighter}}.
The current implementation may suffer performance issues when the result set of the original query contains a lot of results, each of them possibly containing lots of (stored) properties that get passed to the highlighter in order to try to extract the excerpt; such a process doesn't stop as soon as the first excerpt is found so that excerpt is composed using text from all stored properties in all results (if there's a match on the query).

While we can accept some cost of extracting excerpt at query time (whereas it was generated at excerpt retrieval time, e.g. via _row.getValue("rep:excerpt")_) , that should be bounded and mitigated as much as possible.




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