[jira] [Created] (OAK-1263) optimize oak index to support 'fast ORDER BY' queries to support sorting & pagination for large set of children

["Stefan Egli (JIRA)" <ji...@apache.org>]

Stefan Egli created OAK-1263:
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             Summary: optimize oak index to support 'fast ORDER BY' queries to support sorting & pagination for large set of children
                 Key: OAK-1263
                 URL: https://issues.apache.org/jira/browse/OAK-1263
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: query
    Affects Versions: 0.12
            Reporter: Stefan Egli


We have a use case where we'd like to be able to use an index in a "pagination-like" fashion. That is, we'd like to be able to have an index on a subtree on a certain property, and then run a query which does ORDER BY that property combined with OFFSET. That way, essentially allowing pagination of child nodes of a particular parent based on 'sorted by a certain property'.

AFAIU currently the oak index is not optimized to support ORDER BY queries in a fast manner. The index keeps 'the child nodes unsorted', ie to process an ORDER BY, the child nodes would have to be 'manually sorted' which can result in bad performance given a large number of child nodes.



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