Mickaël Sauvée created LUCENE-8810:

             Summary: Flattening of nested disjunctions does not take into 
account number of clause limitation of builder
                 Key: LUCENE-8810
                 URL: https://issues.apache.org/jira/browse/LUCENE-8810
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/search
    Affects Versions: 8.0
            Reporter: Mickaël Sauvée
             Fix For: 8.1.1

In org.apache.lucene.search.BooleanQuery, at the end of the function 
rewrite(IndexReader reader), the query is rewritten to flatten nested 

This does not take into account the limitation on the number of clauses in a 
builder (1024).
 In some circumstances, this limite can be reached, hence an exception is 

Here is a unit test that highlight this.

  public void testFlattenInnerDisjunctionsWithMoreThan1024Terms() throws 
IOException {
    IndexSearcher searcher = newSearcher(new MultiReader());

    BooleanQuery.Builder builder1024 = new BooleanQuery.Builder();
    for(int i = 0; i < 1024; i++) {
      builder1024.add(new TermQuery(new Term("foo", "bar-" + i)), Occur.SHOULD);
    Query inner = builder1024.build();
    Query query = new BooleanQuery.Builder()
        .add(inner, Occur.SHOULD)
        .add(new TermQuery(new Term("foo", "baz")), Occur.SHOULD)

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