Lucene exact ordering

Question

I\'ve had this long term issue in not quite understanding how to implement a decent Lucene sort or ranking. Say I have a list of cities and their populations. If someone se

Answer 1

My current solution is to create an exact searcher and a prefix searcher, both sorted by reverse population, and then copy out all my hits starting from the exact hits, moving to the prefix hits. It makes paging my results slightly more annoying than I think it should be.

Also I used a hash to eliminate duplicates but later changed the prefix searcher into a boolean query of a prefix search (MUST) with an exact search (MUST NOT), to have Lucene remove the duplicates. Though this seemed even more wasteful.

Edit: Moved to a comment (since the feature now exists): Yuval F Thank you for your blog post ... How would the sort comparator know that the name field "london" exactly matches the search term "london" if it cannot access the search term?

Answer 2

dlamblin,let me see if I get this correctly: You want to make a prefix-based query, and then sort the results by population, and maybe combine the sort order with preference for exact matches. I suggest you separate the search from the sort and use a CustomSorter for the sorting: Here's a blog entry describing a custom sorter. The classic Lucene book describes this well.

Answer 3

API for

Sortcomparator

says

There is a distinct Comparable for each unique term in the field - if some documents have the same term in the field, the cache array will have entries which reference the same Comparable

You can apply a

FieldSortedHitQueue

to the sortcomparator which has a Comparator field for which the api says ...

Stores a comparator corresponding to each field being sorted by.

Thus the term can be sorted accordingly