Say I'm trying to query a bunch of documents that have categories and I want to limit the queries to a specified category (as I understand it this would just be using the fq parameter (filter query).
I was wondering if there is a performance improvement for having the parameter be an integer instead of a string or something as is usually the case with data? I would just err on the right side but I thought I'd double check in case it didn't matter very much and Solr performed some sort of optimization under the hood?
It would be much more convenient if I could just filter on string matches but..
Thanks for any tips folks
Unless you need to perform range queries (numeric fields have special support for this) or sorting (the int field cache is more memory-efficient than the String field cache), they should be roughly equivalent.
来源：https://stackoverflow.com/questions/12490238/solr-filter-query-string-vs-int