是Lucene +经典查询搜索语法与使用AND相同

Question

A Lucene query of the form

field1:+"term1" field2:+"term2"

seems to be equivalent to

field1:"term1" OR field2:"term2"

I expected it to be equivalent to

field1:"term1" AND field2:"term2"

(ie for my particular query on my database query 1 and 2 are returning 10 records, whereas query 3 is returning 6 records, I would expect query 2 to only return six records)

Im aware that if there is no OR or AND it defaults to OR but I thought the + means that term has to match, otherwise what is the point of the + What am i misunderstanding ?

Answer 1

That query doesn't look equivalent to either of those, to me.

field1:+"term1" field2:+"term2"

Is just invalid syntax, and the standard QueryParser does kick out a ParseException for it (maybe your code is swallowing the exception silently or something?).

It should be:

+field1:"term1" +field2:"term2"