[jira] [Created] (OAK-3403) Multiplexing store support in Property indexes

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

Chetan Mehrotra created OAK-3403:
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             Summary: Multiplexing store support in Property indexes
                 Key: OAK-3403
                 URL: https://issues.apache.org/jira/browse/OAK-3403
             Project: Jackrabbit Oak
          Issue Type: Technical task
          Components: query
            Reporter: Chetan Mehrotra
            Assignee: Chetan Mehrotra


In Oak one can define an index anywhere in the repository under a special node name {{oak:index}}. For e.g. if you want a property index for {{sling:resourceType}} at root level then you can create the index at /oak:index/resourceType and this index would store the index content at /oak:index/resourceType/:index.

# Writing - At time of commit the IndexEditor would need to decide where the indexed content for a given path should be stored. To start with it can make use of PathToStoreMapper to decide which node to use the indexed content. For e.g. for /libs the indexed content is stored under :index-pr and for /content :index-sr is used. This is simpler for PropertyIndex where IndexStoreStrategy can be passed the right node
# Reading - At time of reading the QueryIndex implementation would need to provide a union cursor which can perform lookup from all such store directories for a given index. 

*Open Items*
# Supporting unique indexes
# Introducing new oak:index - Node under oak:index node are special. Depending on parent path it might be possible that they would have to be created in both repositories. For e.g. /oak:index would have to be present in both PR and SR. While /content/foo/oak:index can live only in SR. 



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