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Posted to issues@lucene.apache.org by "Mayya Sharipova (Jira)" <ji...@apache.org> on 2020/07/31 19:05:00 UTC

[jira] [Resolved] (LUCENE-9384) Backport for the field sort optimization of LUCENE-9280

     [ https://issues.apache.org/jira/browse/LUCENE-9384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mayya Sharipova resolved LUCENE-9384.
-------------------------------------
    Fix Version/s: 8.7
       Resolution: Fixed

> Backport for the field sort optimization of LUCENE-9280
> -------------------------------------------------------
>
>                 Key: LUCENE-9384
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9384
>             Project: Lucene - Core
>          Issue Type: Task
>    Affects Versions: 8.x
>            Reporter: Mayya Sharipova
>            Priority: Minor
>             Fix For: 8.7
>
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> Field sort optimization implemented in LUCENE-9280 is based on an assumption that if a numeric field is indexed with both doc values and points, the *same data* is stored in these points and doc values.  While there is  a plan in LUCENE-9334 to enforce this consistency from Lucene 9.0, there is nothing in Lucene 8.x to enforce this assumption.
>  
> Thus in order to backport the sort optimization to 8.x, we need to make a user to explicitly opt in for it. This could be done by either:
>  * introducing a special SortField (e.g. DocValuesPointSortField) that will use optimization
>  * introduce a bool parameter to a SortField which when true will indicate that the sort optimization should be enabled (e.g. SortField("my_field", SortField.Type.LONG, true))
>  



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