[Xapian-discuss] QueryParser is strange with boolean filter

[Sungsoo Kim]

I have encountered something strange with QueryParser.
This is not critical because I have found how to avoid this
problem.

In the following results, D, E cases are something unexpected.
I could avoid this by changing the input string into the format  
as case F without plus sign in boolean filter terms.


1. version : xapian 0.9.4 version with UTF-8 patch

2. parse query source code
    qp = xapian.QueryParser()
    qp.set_database(database)
    qp.set_default_op(xapian.Query.OP_AND)
    qp.set_stemming_strategy(xapian.QueryParser.STEM_NONE)
    qp.add_boolean_prefix("XTYPE", "XTYPE:")
    query = qp.parse_query(input,
        xapian.QueryParser.FLAG_BOOLEAN |
        xapian.QueryParser.FLAG_BOOLEAN_ANY_CASE |
        xapian.QueryParser.FLAG_PHRASE |
        xapian.QueryParser.FLAG_LOVEHATE |
        xapian.QueryParser.FLAG_WILDCARD)
    print "Performing query '%s'" % query.get_description()

3. test result

Case A: OK
$ python search.py -v cup XTYPE:H XTYPE:V
Performing query 'Xapian::Query((cup:(pos=1) FILTER (XTYPE:H AND XTYPE:V)))'

Case B: OK
$ python search.py -v cup +XTYPE:H +XTYPE:V
Performing query 'Xapian::Query((cup:(pos=1) FILTER (XTYPE:H AND XTYPE:V)))'

Case C: OK
$ python search.py -v cup -XTYPE:H -XTYPE:V
Performing query 'Xapian::Query((cup:(pos=1) AND_NOT (XTYPE:H OR XTYPE:V)))'

Case D: ?
$ python search.py -v cup -XTYPE:H +XTYPE:V
Performing query 'Xapian::Query((cup:(pos=1) FILTER (XTYPE:H AND XTYPE:V)))'

Case E: ?
$ python search.py -v cup +XTYPE:H -XTYPE:V 
Performing query 'Xapian::Query((cup:(pos=1) FILTER (XTYPE:H AND XTYPE:V)))'

Case F: OK
$ python search.py -v cup XTYPE:H -XTYPE:V 
Performing query 'Xapian::Query(((cup:(pos=1) AND_NOT XTYPE:V) FILTER XTYPE:H))'



Sungsoo Kim