Can a multiterm (lucene) query do a fuzzy search on only selected fields?

Question

I'm trying to implement a fuzzy query for selected fields within a broader multi-term query. For example, let's say the fields are name and email . I want to do fuzzy searches on name, but I only want exact matches on the email field .

At the moment, I construct the parser like this (this is using FlexLucene, so this is actually in C#, but it should have full parity with regular Java Lucene):

var parser = new MultiFieldQueryParser(fields, analyzer);

where fields is a string[] containing {"name", "email"} , and analyzer is the StandardAnalyzer , which is the same one used at the time of indexing.

So what I'm shooting for is the following: a query string like "smith" should result in hits on { 'name': 'Harry Smith', 'email': 'harry@where.com' } , { 'name': 'Tom Smythe', 'email': 'tom@tom.com' } , and { 'name': 'Sara Jones', 'email': 'smith@xyz.com' } , but not { 'name': 'Tom Jones', 'email': 'smythe@abc.com' } .

Answer 1

If think of creation query from code the query should be created as (for java version):

//match Smith Smythe
Query name = new PrefixQuery(new Term("name", name)) 
//match smith@xyz.com but not a smythe@abc.com
Query email = new PrefixQuery(new Term("name", name+"@")) 
BooleanQuery.Builder builder = new BooleanQuery.Builder();
builder.add(name, BooleanClause.Occur.SHOULD);
builder.add(name, BooleanClause.Occur.SHOULD);
Query query = builder.build();

But as I understand you is needed in a parser. Lucene parser has a sophisticated logic (wildcards, boosting etc.) and not clear, what you is actually needed from it. As for simple solution I can suggest to override method getFieldQuery , if the field is not set, should create a query like describing above, otherwise pass call to parent.