[SOLR-9176] Legacy Faceting Term Enum Method Regression - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: 5.2, 5.2.1, 5.3, 5.3.1, 5.3.2, 5.4, 5.4.1, 5.5, 5.5.1, 6.0, 6.0.1
Fix Version/s: 5.5.2, 5.6, 6.0.2, 6.1
Component/s: faceting
Labels:
None

Description

Starting from this commit :

~~LUCENE-5666~~: get solr started
git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5666@1594254 13f79535-47bb-0310-9956-ffa450edef68

https://github.com/apache/lucene-solr/commit/1489085807cb10981a7ea5b5663ada4e3f85953e#diff-5ac9dc7b128b4dd99b764060759222b2

It is not possible to use Term Enum as a faceting method, for numeric and single valued fields ( org.apache.solr.request.SimpleFacets ) .

We personally verified that there are use cases when this is bringing a quite big performance regression ( even with DocValues enabled) .
In the mailing list from time to time people complain about a regression happening with the term enum method, but actually it is more likely to be the automatic forcing of FCS.

Forcing FCS in co-op with the famous regression that happened in SOLR-8096 could be confused as a term Enum regression.