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https://issues.apache.org/jira/browse/LUCENE-5666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000782#comment-14000782
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David Smiley commented on LUCENE-5666:
--------------------------------------
Oh, right. I'll repost it here for everyone's benefit:
{noformat}
* LUCENE-5666: Change uninverted access (sorting, faceting, grouping, etc)
to use the DocValues API instead of FieldCache. For FieldCache functionality,
use UninvertingReader in lucene/misc (or implement your own FilterReader).
UninvertingReader is more efficient: supports multi-valued numeric fields,
detects when a multi-valued field is single-valued, reuses caches
of compatible types (e.g. SORTED also supports BINARY and SORTED_SET access
without insanity). "Insanity" is no longer possible unless you explicitly
want it.
Rename FieldCache* and DocTermOrds* classes in the search package to
DocValues*.
Move SortedSetSortField to core and add SortedSetFieldSource to queries/,
which
takes the same selectors. Add helper methods to DocValues.java that are
better
suited for search code (never return null, etc). (Mike McCandless, Robert
Muir)
{noformat}
I looked up DocValues which is new to me but the commit message references
LUCENE-5573 which seems mis-attributed. I'm kinda surprised FieldCache isn't
deprecated. It could be marked \@lucene.internal. At least... it's name
doesn't seem appropriate anymore. Maybe UninvertedCache. But perhaps a rename
like that would introduce too much change for now, even though it's trunk. It
could use some javadocs stating that DocValues.java should generally be used
instead.
> Add UninvertingReader
> ---------------------
>
> Key: LUCENE-5666
> URL: https://issues.apache.org/jira/browse/LUCENE-5666
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: 5.0
>
> Attachments: LUCENE-5666.patch
>
>
> Currently the fieldcache is not pluggable at all. It would be better if
> everything used the docvalues apis.
> This would allow people to customize the implementation, extend the classes
> with custom subclasses with additional stuff, etc etc.
> FieldCache can be accessed via the docvalues apis, using the FilterReader api.
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