[jira] [Updated] (LUCENE-7122) BytesRefArray can be more efficient for fixed width values

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-7122:
---------------------------------------
    Attachment: LUCENE-7122.patch

Patch, changing {{BytesRefArray}} to lazily create the {{int[] offsets}} only when it sees that they are different across values.  We could alternatively make a separate class ({{FixedWidthBytesRefArray}}?) but I think we have too many of these already...


> BytesRefArray can be more efficient for fixed width values
> ----------------------------------------------------------
>
>                 Key: LUCENE-7122
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7122
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: master, 6.1
>
>         Attachments: LUCENE-7122.patch
>
>
> Today {{BytesRefArray}} uses one int ({{int[]}}, overallocated) per
> value to hold the length, but for dimensional points these values are
> always the same length. 
> This can save another 4 bytes of heap per indexed dimensional point,
> which is a big improvement (more points can fit in heap at once) for
> 1D and 2D lat/lon points.



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