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Posted to issues@lucene.apache.org by "Bruno Roustant (Jira)" <ji...@apache.org> on 2021/03/01 09:32:00 UTC
[jira] [Resolved] (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:all-tabpanel ]
Bruno Roustant resolved LUCENE-9815.
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Resolution: Won't Do
> 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
> Attachments: Screen_Shot_2021-02-28_at_16.08.05.png
>
>
> 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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