The interp (interpreted) module assigns a score to each result record based on the query processing techniques used to obtain the match. These matching techniques include partial matching, cross-attribute matching, thesaurus, and stemming matching.
Specifically, the Interpreted module ranks results as follows:
All non-partial matches are ranked ahead of all partial matches.
Within the above strata, all single-field matches are ranked ahead of all cross-field matches.
Within the above strata, all thesaurus matches are ranked below all non-thesaurus matches.
Within the above strata, all stemming matches are ranked below all non-stemming matches.
Note: Because the interp module comprises the matching techniques of the spell, glom, stem, and thesaurus modules, there is no need to add them to your relevance ranking strategy if you are using interp.
