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https://issues.apache.org/jira/browse/SOLR-12516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522598#comment-16522598
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Hoss Man commented on SOLR-12516:
---------------------------------
I only discovered this because of a randomized failure from
{{CurrencyRangeFacetCloudTest}} while testing out SOLR-12343 -- that patch
(currently) enforces that every shard which has at least one bucket for a field
facet must "contribute" to every bucket (either in phase#1 or via refinement)
to be returned -- and it can cause the existing
{{testJsonRangeFacetWithSubFacet}} to fail for some (randomized) shard count
because of this bug.
I'll try to work up a more isolated, generalized, test case that shows
incorrect counts (on a simple/non-currency) for a range facet w/o SOLR-12343 in
place
> JSON "range" facets don't refine sub-facets under special buckets
> (before,after,between)
> ----------------------------------------------------------------------------------------
>
> Key: SOLR-12516
> URL: https://issues.apache.org/jira/browse/SOLR-12516
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: Hoss Man
> Priority: Major
>
> {{FacetRangeMerger extends FacetRequestSortedMerger<FacetRange>}} ... however
> {{FacetRangeMerger}} does not override {{getRefinement(...)}} which means
> only {{FacetRequestSortedMerger.buckets}} is evaluated and considered for
> refinement. The additional, special purpose, {{FacetBucket}} instances
> tracked in {{FacetRangeMerger}} are never considered for refinement.
> In a simple range facet this doesn't cause any problems because these buckets
> are returned by every shard on the phase#1 request -- but *if a sub-facet
> (such as a field facet) is nested under a range facet then the buckets
> returned by the sub-facets for the before/between/after buckets will never be
> refined* ... the phase#1 sub-facet buckets will be merged as.
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