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https://issues.apache.org/jira/browse/LUCENE-9970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17350698#comment-17350698
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Chris M. Hostetter commented on LUCENE-9970:
--------------------------------------------
The simplest approach would probably be add an additional {{TooManyClauses}}
constructor that allows the caller to set the exception message, and use this
new constructor from the new IndexSearcher QueryVisitor code paths that throw
{{TooManyClauses}}, with a new message clarifying that the number of nested
clauses is the problem (since the initial query construction/rewriting would
have already failed if a single sub-query was problematic)
that way any pre-9.x situations that caused {{TooManyClauses}} would continue
to get the exact same message, only the "new" types of failure cases would get
a slightly diff exception message
> provide apps details about why TooManyClauses was thrown
> --------------------------------------------------------
>
> Key: LUCENE-9970
> URL: https://issues.apache.org/jira/browse/LUCENE-9970
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Chris M. Hostetter
> Priority: Major
>
> Historically, if {{TooManyClauses}} was thrown it meant exactly one thing:
> That a QueryX Builder (typically BooleanQuery, but there are a few others in
> sandbox) was not going to allow it's caller to add a clause because that
> QueryX object already had the maxClauseCount in _direct_ children.
> LUCENE-8811 added an additional "reason" why {{TooManyClauses}} may be thrown
> starting in 9.0: IndexSearcher may now throw this exception if the
> (rewritten) Query being executed has a _cumulative_ number of clauses –
> across the entire structure of _nested_ Query objects – that exceeds the
> maxClauseCount.
> ----
> I think it would be helpful to users if it was possible to tell from the
> {{TooManyClauses}} exception how the maxClauseCount was exceeded (because of
> the total number of direct children during rewrite, or cumulatively across
> the entire nested structure) w/o needing to inspect the stack frames to see
> if the thrower a rewrite method, or a QueryVisitor method.
>
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