Xapian discuss - Apr 2021 - need help on FLAG_PARTIAL

Hi,
I have some docs with a fields named "phone",
something like that:
{
ID int
Name str
Phone str
}
I created an index for them and gave a prefix "P" to the field
"phone",
and there is one doc whose value of phone is "53083763748".
However, when I searched that field using FLAG_PARTIAL, I can only get
results when I used the following code:

queryparser.add_prefix("phone", "P")
query = queryparser.parse_query("phone:5",
xapian.QueryParser.FLAG_PARTIAL)

when I expand the query to "53" or "530", I can only get
nothing.

queryparser.add_prefix("phone", "P")
query = queryparser.parse_query("phone:53",
xapian.QueryParser.FLAG_PARTIAL)

there must be something wrong, but I cannot tell where it is. Would you
please help me with this?
Thanks.

--
all the best.

On Tue, Apr 20, 2021 at 10:34:31AM +0800, Eden He wrote:
> I created an index for them and gave a prefix "P" to the field
"phone",
> and there is one doc whose value of phone is "53083763748".
> However, when I searched that field using FLAG_PARTIAL, I can only get
> results when I used the following code:
> 
> queryparser.add_prefix("phone", "P")
> query = queryparser.parse_query("phone:5",
xapian.QueryParser.FLAG_PARTIAL)
> 
> when I expand the query to "53" or "530", I can only
get nothing.
> 
> queryparser.add_prefix("phone", "P")
> query = queryparser.parse_query("phone:53",
xapian.QueryParser.FLAG_PARTIAL)
> 
> there must be something wrong, but I cannot tell where it is. Would you
> please help me with this?
I can't reproduce your problem.

Creating the database:

$ python3 -c 'import xapian; db=xapian.WritableDatabase("tmp.db");
doc=xapian.Document(); doc.add_term("P53083763748");
db.add_document(doc); db.commit()'

And:

$ python3 -c 'import xapian; db=xapian.Database("tmp.db");
enq=xapian.Enquire(db); qp=xapian.QueryParser();
qp.add_prefix("phone", "P")
for q in (5, 53, 530): enq.set_query(qp.parse_query("phone:"+str(q),
xapian.QueryParser.FLAG_PARTIAL)); print("%d -> %d match" % (q,
enq.get_mset(0,10).size()))'
5 -> 1 match
53 -> 1 match
530 -> 1 match

If you still can't get it to work, please post a simple script which
demonstrates it not working.

Cheers,
    Olly