Right. I understand that the TermFirstPassGroupingCollector is extended from Collector class too. Let me try.
Many thanks to you! -----邮件原件----- 发件人: martijn.is.h...@gmail.com [mailto:martijn.is.h...@gmail.com] 代表 Martijn v Groningen 发送时间: 2013年2月11日 19:29 收件人: java-user@lucene.apache.org 主题: Re: About the Sorting of Groups during Grouping by Hi, My purpose is trying to sort the groups based on some way of aggregation > values of the scores of all the documents in each group, such as their sums > or averages. > At the moment this isn't possible out of the box. You could implement your own collector that collects these statistics per group. Embed the the result in a FieldComparator that you use as custom sort in the TermFirstPassGroupingCollector. But this is just a wild idea. > > > > There is an 'Enum TopGroups.ScoreMergeMode' in the > org.apache.lucene.search.grouping package with the description as "How the > GroupDocs score (if any) should be merged." Is it exactly introduced for > the > purpose above? If yes, how to included it into the grouping code? A demo > code would be perfect. > The enum is actually only used by the join module (ToParentBlockJoinCollector). The enum controls how the block join group scores are aggregated during a distributed search. Martijn --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
