java - 为什么 Solr 不按最大相似度因子进行排名？

Question

我创建了一个自定义相似性类，我希望 Solr 按 coord() 进行排名。在我的结果中，带有此调试查询结果的文档

 0.0 = (MATCH) weight(text:现在 in 0) [MyNewSimilarityClass], result of:
      0.0 = score(doc=0,freq=1.0 = termFreq=1.0
         ), product of:
        0.0 = queryWeight, product of:
          0.0 = idf(docFreq=103081, maxDocs=4060152)
          0.0 = queryNorm
        0.0 = fieldWeight in 0, product of:
          0.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          0.0 = idf(docFreq=103081, maxDocs=4060152)
          1.0 = fieldNorm(doc=0)
  1.43425728E8 = coord(2/167)

排名高于具有此调试查询结果的文档

 0.0 = (MATCH) weight(text:中国 in 5) [MyNewSimilarityClass], result of:
      0.0 = score(doc=5,freq=1.0 = termFreq=1.0),
        product of:
        0.0 = queryWeight, product of:
          0.0 = idf(docFreq=39366, maxDocs=4060152)
          0.0 = queryNorm
        0.0 = fieldWeight in 5, product of:
          0.0 = tf(freq=1.0), with freq of:
            1.0 = termFreq=1.0
          0.0 = idf(docFreq=39366, maxDocs=4060152)
          1.0 = fieldNorm(doc=5)
  8.9641069E8 = coord(5/167)

除了 coord() 因子之外，两者都是相等的，为什么不将较高的结果 coord() 因子放在排名的第一位？

Answer 1

由于您的其他评分因素为零，因此两个文档的总分为零/0(这是首先显示的值)。评分(主要)是每个术语的乘积(而不是相加)。

参见Lucene's Practical and Conceptual Scoring Formula .