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From Steven White <>
Subject Single field in "qf" vs multiple
Date Wed, 31 Jul 2019 12:51:57 GMT
Hi everyone,

I'm indexing my data into multiple Solr fields, such as A, B, C and I'm
also copying all the data of those fields into a master field such as X.

By default, my "qf" is set to X so anytime a user is searching they are
searching across the data that also exist in fields A, B and C.

In some use cases, I need to narrow down a user's search to just A and C or
A only, etc.  When that happens, I dynamically, at run time set "qf" to "A
C" or just "A".

My question is this, will the search quality and ranking be different if I
simply set "qf" to "A B C" and avoid the copy operation to "X" (it will
save me disk space)?  Will there be a performance impact if I do this?  Is
there a limit at which point I should not list more than N fields in "qf"?



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