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https://issues.apache.org/jira/browse/LUCENE-9815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17292518#comment-17292518
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Bruno Roustant commented on LUCENE-9815:
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[~rcmuir] do you mean always compressing sorted docvalues and having a on/off
mode for binary docvalues?
Based on LUCENE-9378 binary docvalues compression causes a big perf impact, so
currently the on/off compression mode for all docvalues is not so useful as
users do not want to hit the perf for binary docvalues so they don't enable
compression for sorted set neither.
> PerField formats can select the format based on FieldInfo
> ---------------------------------------------------------
>
> Key: LUCENE-9815
> URL: https://issues.apache.org/jira/browse/LUCENE-9815
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Bruno Roustant
> Priority: Minor
>
> PerFieldDocValuesFormat and PerFieldPostingsFormat currently only select the
> format based on the field name.
> If we improve them to also support the selection based on the FieldInfo, it
> will be possible to select based on some FieldInfo attribute, DocValuesType,
> etc.
> +Example use-case:+
> It will be possible to adapt the compression mode of doc values fields
> easily based on the DocValuesType. E.g. compressing sorted and not binary doc
> values.
> > User creates a new custom codec which provides a custom DocValuesFormat
> > which extends PerFieldDocValuesFormat and implements the method
> DocValuesFormat getDocValuesFormatForField(FieldInfo fieldInfo).
> This method provides either a standard Lucene80DocValuesFormat (no
> compression) or another new custom DocValuesFormat extending
> Lucene80DocValuesFormat with BEST_COMPRESSION mode.
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