Bruno Roustant created LUCENE-9815:
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Summary: 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
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.
+Use-case example:+
It will be possible for example 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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