dsmiley commented on code in PR #5303:
URL: https://github.com/apache/solr/pull/5303#discussion_r4520678516


##########
changelog/unreleased/SOLR-18625-empty-phrase-boost-matchalldocs.yml:
##########
@@ -0,0 +1,12 @@
+title: Fix the eDisMax parser adding an empty phrase field (pf) boost clause 
when no phrase qualifies
+  for the boost, such as for single-term queries or q=*:*, and an empty boost 
query (bq) clause when
+  the bq consists only of stopwords. The empty SHOULD clauses did not affect 
scoring but defeated the
+  single-clause MatchAllDocsQuery optimization; they are now omitted, so q=*:* 
reduces to a
+  MatchAllDocsQuery even when pf or bq is set.
+type: fixed

Review Comment:
   "defeating an optimization" doesn't sound like a user will experience this 
as a bug.  I'm thinking "changed".  WDYT?



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