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https://issues.apache.org/jira/browse/LUCENE-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13753622#comment-13753622
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Uwe Schindler commented on LUCENE-5189:
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bq. This callback would need to also get the docid I guess (it's missing in
your API example)?
Of course we could add this. Java 8 would also support this cool syntax,
something like: {{writer.updateDocValues(term, (docid, value) -> value+1);}}
The Java 8 example here was just syntactic sugar: For all this its only
important that it is an {{interface}} with only one method that gets as many
parameters as needed and returns one value. We automatically get the cool java
8 syntax for users, if we design the callback interface to these guidelines.
One common example is the "Comparator" interface in Java. Every Comparator<T>
can be written in this cool syntax :-)
> 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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