jaisonbi edited a comment on pull request #2213:
URL: https://github.com/apache/lucene-solr/pull/2213#issuecomment-772993254
Thanks for the detailed suggestion:) @bruno-roustant
Will add a **new custom codec** to support compression or un-compression
mode. I name it as "Lucene90ExpertCodec", in this codec, user will have more
compression choices, likes Terms Dict compression, Binary DocValue compression..
One doubt, PerFieldDocValuesFormat provides one method for getting Format
according to field name.
`public abstract DocValuesFormat getDocValuesFormatForField(String field);`
so we need to use the approach as @bruno-roustant suggested:
> The choice can be made either based on a config (e.g. file) which lists
all compressed DocValue based fields, or based on a naming convention.
we need to maintain the config file, and the field name list may got
change...Regarding on the "naming convention" approach, we need to give rules
to the field name definition(Please correct me if I am wrong)...I am afraid
it's a heavy burden for users if they want to enable terms-dict compression for
the exist indices.
There's another two options:
1. Use a global switch in "Lucene90ExpertCodec", so Terms-Dict
compression/Binary DocValue Compression can be enabled easily.
2. Based on PerFieldDocValuesFormat, but add one more method:
`public abstract DocValuesFormat getDocValuesFormatForField(FieldInfo
field);`
We can add new attribute in FieldInfo to identify the
compression-enabled fields.
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