rewrite()ing BooleanQuery results in empty clauses

I am rewriting some BooleanQueries and the end result contains some empty queries. The initial query is of the form: Field1:foo* Field2:foo* Field3:foo* Field4:foo* Field5:foo* Field6:foo* The rewritten query is of the form: ConstantScore(Field1:foo*) ConstantScore(Field2:foo*) ConstantScore(Quer

Re: rewrite()ing BooleanQuery results in empty clauses

For 2.9, I believe there's hardly any runtime cost to the embedded BooleanQuery instances that have no clauses -- when the scorer method is invoked, it will return null, which will in turn translate into an DocIdSet.EMPTY_DOCIDSET that ends the iteration immediately on the first call to nextDoc. B