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https://issues.apache.org/jira/browse/LUCENE-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13753476#comment-13753476
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Shai Erera commented on LUCENE-5189:
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Regarding problem 1, I don't know if it's a valid solution, but maybe if we
recorded a per-field-format map for each SegInfo, Lucene45Codec could
initialize its dvFormat accordingly? This is not generic though .. it's like we
need to have a Codec.serialize() method which dumps stuff to SegInfo (or
returns a BytesRef/String from which it can later initialize itself). We'd then
not need the attributes on FieldInfo. We have to somehow employ the same logic
as we do in PerFieldDVF.FieldsReader, in PerFieldDVF.FieldsWriter for updating
existing segments. Whatever solution we'll do here, will help us when we come
to implement field updates for postings.
> Numeric DocValues Updates
> -------------------------
>
> Key: LUCENE-5189
> URL: https://issues.apache.org/jira/browse/LUCENE-5189
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-5189.patch, LUCENE-5189.patch, LUCENE-5189.patch,
> LUCENE-5189.patch
>
>
> In LUCENE-4258 we started to work on incremental field updates, however the
> amount of changes are immense and hard to follow/consume. The reason is that
> we targeted postings, stored fields, DV etc., all from the get go.
> I'd like to start afresh here, with numeric-dv-field updates only. There are
> a couple of reasons to that:
> * NumericDV fields should be easier to update, if e.g. we write all the
> values of all the documents in a segment for the updated field (similar to
> how livedocs work, and previously norms).
> * It's a fairly contained issue, attempting to handle just one data type to
> update, yet requires many changes to core code which will also be useful for
> updating other data types.
> * It has value in and on itself, and we don't need to allow updating all the
> data types in Lucene at once ... we can do that gradually.
> I have some working patch already which I'll upload next, explaining the
> changes.
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