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https://issues.apache.org/jira/browse/LUCENE-10015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17384430#comment-17384430
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Julie Tibshirani commented on LUCENE-10015:
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I was initially hesitant about removing the option for "NONE", since it gives a
convenient way to store/ load vectors when you just need them for ranking.
Otherwise many users could be writing the same encoding logic to store vectors
in binary doc values. But Adrien mentioned an idea that I found helpful: if
there's future feedback that it would be useful, we could consider adding
convenience utilities/ wrappers for doc values to make this easy.
> Remove VectorValues.SimilarityFunction, remove NONE
> ---------------------------------------------------
>
> Key: LUCENE-10015
> URL: https://issues.apache.org/jira/browse/LUCENE-10015
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Priority: Blocker
> Fix For: 9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> This stuff is HNSW-implementation specific. It can be moved to a codec
> parameter.
> The NONE option should be removed: it just makes the codec more complex.
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