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https://issues.apache.org/jira/browse/SOLR-17130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17811368#comment-17811368
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Kevin Risden commented on SOLR-17130:
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https://github.com/apache/solr/pull/2218
> edismax MatchAllDocsQuery (*:*) Optimization
> --------------------------------------------
>
> Key: SOLR-17130
> URL: https://issues.apache.org/jira/browse/SOLR-17130
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.11.2
> Reporter: Kevin Risden
> Assignee: Kevin Risden
> Priority: Major
>
> This unwraps the case of using edismax query parser and q=*:*. Prior to this
> change, *:* was being changed to +*:* which wraps the MatchAllDocsQuery with
> a boolean query. We can unwrap the boolean query since its not necessary if
> the MatchAllDocsQuery is the only clause.
> I found this by looking at https://issues.apache.org/jira/browse/SOLR-14765
> and wondering why when using edismax the optimizations were skipped even
> though the query was *:*. The boolean wrapped MatchAllDocsQuery means that
> some of the optimization logic is skipped -
> https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java#L1623
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