Override this and return true if your collector (e.g., Join.ToParentBlockJoinCollector) expects all sub-scorers to be positioned on the document being collected. This will cause some performance loss; default is false. Note that if you return true from this method (in a subclass) be sure your collector also returns false from Collector.AcceptsDocsOutOfOrder: this will trick BooleanQuery into also scoring all subDocs at once.
