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https://issues.apache.org/jira/browse/LUCENE-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574265#comment-13574265
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Commit Tag Bot commented on LUCENE-4757:
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[branch_4x commit] Shai Erera
http://svn.apache.org/viewvc?view=revision&revision=1443839
LUCENE-4757: cleanup FacetsAccumulator API
> Cleanup FacetsAccumulator API path
> ----------------------------------
>
> Key: LUCENE-4757
> URL: https://issues.apache.org/jira/browse/LUCENE-4757
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4757.patch, LUCENE-4757.patch, LUCENE-4757.patch,
> LUCENE-4757.patch
>
>
> FacetsAccumulator and FacetRequest expose too many things to users, even when
> they are not needed, e.g. complements and partitions. Also, Aggregator is
> created per-FacetRequest, while in fact applied per category list. This is
> confusing, because if you want to do two aggregations, e.g. count and
> sum-score, you need to separate the two dimensions into two different
> category lists at indexing time.
> It's not so easy to refactor everything in one go, since there's a lot of
> code involved. So in this issue I will:
> * Remove complements from FacetRequest. It is only relevant to
> CountFacetRequest anyway. In the future, it should be a special Accumulator.
> * Make FacetsAccumulator concrete class, and StandardFacetsAccumulator extend
> it and handles all the stuff that's relevant to sampling, complements and
> partitions. Gradually, these things will be migrated to the new API, and
> hopefully StandardFacetsAccumulator will go away.
> * Aggregator is per-document. I could not break its API b/c some features
> (e.g. complement) depend on it. So rather I created a new FacetsAggregator,
> with a bulk, per-segment, API. So far migrated Counting and SumScore to that
> API.
> ** In the new API, you need to override FacetsAccumulator to define an
> Aggregator for use, the default is CountingFacetsAggregator.
> * Started to refactor FacetResultsHandler, which its API was guided by the
> use of partitions. I added a simple {{compute(FacetArrays)}} to it, which by
> default delegates to the nasty API, but overridden by specific classes. This
> will get cleaned further along too.
> * FacetRequest has a .getValueOf() which resolves an ordinal to its value
> (i.e. which of the two arrays to use). I added FacetRequest.FacetArraysSource
> and specialize when they are INT or FLOAT, creating a special
> FacetResultsHandler which does not go back to FR.getValueOf for every
> ordinal. I think that we can migrate other FacetResultsHandlers to behave
> like that ... at the expense of code duplication.
> ** I also added a TODO to get rid of getValueOf entirely .. will be done
> separately.
> * Got rid of CountingFacetsCollector and StandardFacetsCollector in favor of
> a single FacetsCollector which collects matching documents, and optionally
> scores, per-segment. I wrote a migration class from these per-segment
> MatchingDocs to ScoredDocIDs (which is global), so that the rest of the code
> works, but the new code works w/ the optimized per-segment API. I hope
> performance is still roughly the same w/ these changes too.
> There will be follow-on issues to migrate more features to the new API, and
> more cleanups ...
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