Hi everyone,
How to support 'implicit trailing wildcard *' using Solr, eg: using Google to search 'umoun', 'umount' will be matched , search 'mounta', 'mountain' will be matched. >From my point of view, there are several ways, both with disadvantages: 1) Using EdgeNGramFilterFactory, thus 'umount' will be indexed with 'u', 'um', 'umo', 'umou', 'umoun', 'umount'. The disadvantages are: a) the index size increases dramatically, b) will matches even has no relationship, such as such 'mount' will match 'mountain' also. 2) Using two pass searching: first pass searches term dictionary through TermsComponent using given keyword, then using the first matched term from term dictionary to search again. eg: when user enter 'umoun', TermsComponent will match 'umount', then use 'umount' to search. The disadvantage are: a) need to parse query string so that could recognize meta keywords such as 'AND', 'OR', '+', '-', '"' (this makes more complex as I am using PHP client), b) The returned hit counts is not for original search string, thus will influence other components such as auto-suggest component based on user search history and hit counts. 3) Write custom SearchComponent, while have no idea where/how to start with. Is there any other way in Solr to do this, any feedback/suggestion are welcome! Thanks very much in advance!
