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https://issues.apache.org/jira/browse/LUCENE-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756678#comment-13756678
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Robert Muir commented on LUCENE-5189:
-------------------------------------
{quote}
Patch adds per-field support. I currently do that by adding a boolean
'isFieldUpdate' to SegWriteState which is set to true only by
ReaderAndLiveDocs. PerFieldDVF then peeks into that boolean and if it's true,
it reads the format name from FieldInfo.attributes() instead of relying on
Codec.getPerFieldDVF(). If we'll eventually gen FieldInfos, there won't be a
need for this boolean as PerFieldDVF will get that from FI.dvGen.
{quote}
We can't move forward really with this boolean: it only attacks the symptom
(puts a HACK in per-field) without fixing the disease (the codec API).
In general if a codec needs to write to and read from
FieldInfos/SegmentInfos.attributes, it doesnt work here: this api needs to be
fixed.
> 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, 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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