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https://issues.apache.org/jira/browse/LUCENE-9236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17055907#comment-17055907
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Adrien Grand commented on LUCENE-9236:
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[~juan.duran] In my opinion it introduces complexity because it introduces more
abstractions: CompositeFieldMetadata, DocValuesConsumerSupplier, and so on.
> Having a modular Doc Values format
> ----------------------------------
>
> Key: LUCENE-9236
> URL: https://issues.apache.org/jira/browse/LUCENE-9236
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: juan camilo rodriguez duran
> Priority: Minor
> Labels: docValues
>
> Today DocValues Consumer/Producer require override 5 different methods, even
> if you only want to use one and given that one given field can only support
> one doc values type at same time.
>
> In the attached PR I’ve implemented a new modular version of those classes
> (consumer/producer) each one having a single responsibility and writing in
> the same unique file.
> This is mainly a refactor of the existing format opening the possibility to
> override or implement the sub-format you need.
>
> I’ll do in 3 steps:
> # Create a CompositeDocValuesFormat and moving the code of
> Lucene80DocValuesFormat in separate classes, without modifying the inner
> code. At same time I created a Lucene85CompositeDocValuesFormat based on
> these changes.
> # I’ll introduce some basic components for writing doc values in general
> such as:
> ## DocumentIdSetIterator Serializer: used in each type of field based on an
> IndexedDISI.
> ## Document Ordinals Serializer: Used in Sorted and SortedSet for
> deduplicate values using a dictionary.
> ## Document Boundaries Serializer (optional used only for multivalued
> fields: SortedNumeric and SortedSet)
> ## TermsEnum Serializer: useful to write and read the terms dictionary for
> sorted and sorted set doc values.
> # I’ll create the new Sub-DocValues format using the previous components.
>
> PR: [https://github.com/apache/lucene-solr/pull/1282]
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