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Posted to issues@lucene.apache.org by "Robert Muir (Jira)" <ji...@apache.org> on 2021/02/28 15:15:00 UTC
[jira] [Commented] (LUCENE-9815) PerField formats can select the
format based on FieldInfo
[ https://issues.apache.org/jira/browse/LUCENE-9815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17292425#comment-17292425 ]
Robert Muir commented on LUCENE-9815:
-------------------------------------
I still think the use-case/premise here is wrong. We shouldn't even have it as an option to compress the sorted docvalues term dictionary, it should just be what happens.
And any bad code hashing on term bytes and stuff instead of using ordinals should just be fixed.
> 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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