title: Boolean vs non-boolean search
body: <p>I'm having some issues trying to understand what a non-boolean search (if that makes sense) is. As far as I've figured out, a boolean search allows the use of AND, OR and NOT in the query. But what about the non-boolean search? I've read somewhere that that means you can search substrings, not just complete words, but I wanted to make sure I fully understand what each of one means. Also, maybe an example would help, like, is Google boolean or non-boolean? What about Oracle Text or Apahe Solr?</p>