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https://issues.apache.org/jira/browse/SOLR-15429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17350699#comment-17350699
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Chris M. Hostetter commented on SOLR-15429:
-------------------------------------------
Created LUCENE-9970 to explore making it possible to distinguish this new
"class" of failure case.
> Solr implications of LUCENE-8811 changes to how (solr.xml's)
> maxBooleanClauses is now used by IndexSearcher
> -----------------------------------------------------------------------------------------------------------
>
> Key: SOLR-15429
> URL: https://issues.apache.org/jira/browse/SOLR-15429
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Chris M. Hostetter
> Priority: Major
>
> {panel:title=Background Info}
> LUCENE-8811 Modified Lucene 9.x to expanded the usage of
> {{BooleanQuery.maxClauseCount}} (now moved to
> {{IndexSearcher.maxClauseCount}})
> Now, in addition to being a limit on the number of individual clauses that
> can be specified when creating _single_ BooleanQuery (either explicitly or
> during {{Query.rewrite()}}) it is also used by a {{QueryVisitor}} (after
> {{Query.rewrite()}} to enforce a limit on the total number of clauses in a
> _nested_ query structure.
> In other words, the following psuedo code will work in lucene 8, but fail in
> lucene 9...
> {code:java}
> x = new BooleanQuery()
> y = new BooleanQuery()
> for (int i = 0; i < BooleanQuery.maxClauseCount - 1; i++) {
> x.addClause(new TermQuery("fx:" + i))
> y.addClause(new TermQuery("fy:" + i))
> }
> BooleanQuery wrapper = new BooleanQuery(x, y)
> searcher.search(wrapper)
> {code}
> {panel}
> {panel:title=(Current) Impacts on Solr users}
> The solr.xml {{maxBooleanClauses}} setting is what currently controls how
> this value is configured. If unset, it defaults to the lucene default
> (unchanged in 9.x) of 1024 – but the solr.xml files shipped with all versions
> of Solr since 8.1 have specified a value of
> {{"\${solr.max.booleanClauses:1024}"}} (see SOLR-13336)
> The direct impacts of LUCENE-8811 on Solr users (as of the current
> solr.git/main branch) is that queries which worked fine in 8.x may start
> throwing {{TooManyClauses()}} exceptions in 9.x, even with existing (built by
> 8.x) indexes, depending on how complex and deeply nested the query structures
> are.
> {panel}
> This jira is being created as a focal point for assess/discussion what
> changes we want to make to Solr code and/or documentation regarding
> {{maxBooleanClauses}} in Solr 9.0.
>
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