支持Solr中FunctionQuery三元操作

Question

我试图运行Solr的搜索，我需要排序字段如的组合，

q=*:*&sort=endtime != null ? endtime : starttime - 100; 

据我可以从Solr的文档告诉（http://wiki.apache.org/solr/FunctionQuery ）这不被支持。有没有另外一种方法来实现这一点？

Answer 1

您需要在endtime的架构中使用sortMissingLast。

从http://lucene.472066.n3.nabble.com/about-sortMissingLast-and-sortMissingFirst-td473881.html - if sortMissingLast=true then it doesn't matter whether you sort "asc" or "desc", documents that don't have a value for that field will always come last. if sortMissingLast="false" then the default Lucene sort behavior is used, in which "missing" values are sorted the same as empty strings -- it is the "lowest" possible value, so they come first in asc sorts.

一旦你的，你都可以发出此查询： q=*:*&sort=endtime desc,starttime desc

（我不知道为什么你需要从starttime减去100，因为排序顺序将是相同）。