: Every doc returned has a score of 1.0 with the join. : Without join I get scores between 0.40337953 and 0.40530312.
Saying you get scores w/o joining is an apples/oranges comparison -- w/o joining you have a completley differnet query matching differnet documents. what the JoinQParser does is match on a *set* of documents based on from=to equivilence for documents that match on a nested query -- the scoring information from that nested query can't be carried over, because there is no garuntee of a 1-to-1 matching. The best way to understand this is porbably with the explanation on the wiki.. http://wiki.apache.org/solr/Join#Compared >> For people who are used to SQL, it's important to note that Joins in >> Solr are not really equivalent to SQL Joins because no information >> about the table being joined "from" is carried forward into the final >> result. A more appropriate SQL analogy would be an "inner query" if you truely have a 1-to-1 mapping where you want to map the scores over, then things would be much faster if you indexed your documents with that 1-to-1 mapping flattened. -Hoss
