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Posted to issues@lucene.apache.org by "Feng Guo (Jira)" <ji...@apache.org> on 2022/02/08 06:06:00 UTC
[jira] [Commented] (LUCENE-10409) Improve BKDWriter's DocIdsWriter to better encode decreasing sequences of doc IDs
[ https://issues.apache.org/jira/browse/LUCENE-10409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488607#comment-17488607 ]
Feng Guo commented on LUCENE-10409:
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+1, Great idea! I'd like to take on this if you agree.
> Improve BKDWriter's DocIdsWriter to better encode decreasing sequences of doc IDs
> ---------------------------------------------------------------------------------
>
> Key: LUCENE-10409
> URL: https://issues.apache.org/jira/browse/LUCENE-10409
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Priority: Minor
>
> [~gf2121] recently improved DocIdsWriter for the case when doc IDs are dense and come in the same order as values via the CONTINUOUS_IDS and BITSET_IDS encodings.
> We could do the same for the case when doc IDs come in the opposite order to values. This would be used whenever searching on a field that is used for index sorting in the descending order. This would be a frequent case for Elasticsearch users as we're planning on using index sorting more and more on time-based data with a descending sort on the timestamp as the last sort field.
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