[jira] [Commented] (LUCENE-6352) Add global ordinal based query time join

["Adrien Grand (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-6352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14390204#comment-14390204 ] 

Adrien Grand commented on LUCENE-6352:
--------------------------------------

Or maybe we could just document that this feature expects that the join field stores utf8 string values?

> Add global ordinal based query time join 
> -----------------------------------------
>
>                 Key: LUCENE-6352
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6352
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>         Attachments: LUCENE-6352.patch, LUCENE-6352.patch, LUCENE-6352.patch, LUCENE-6352.patch
>
>
> Global ordinal based query time join as an alternative to the current query time join. The implementation is faster for subsequent joins between reopens, but requires an OrdinalMap to be built.
> This join has certain restrictions and requirements:
> * A document can only refer to on other document. (but can be referred by one or more documents)
> * A type field must exist on all documents and each document must be categorized to a type. This is to distingues between the "from" and "to" side.
> * There must be a single sorted doc values field use by both the "from" and "to" documents. By encoding join into a single doc values field it is trival to build an ordinals map from it.



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