synonym expansion for boolean prefixes.

[David Bremner]

I have an application for synonyms for tags in in notmuch, which means
synonym expansion for a particular boolean prefix. I have a vague memory
of Olly telling me this doesn't work, but I'm not sure about the
details.

My higher level goal is to support a kind of indirection with tags,
where query tag:foo can really generate tag:bar or tag:fub, depending on
some kind of configuration.

Please CC me on any replies, I'm not subscribed to the list.

######################################################################
import xapian

db=xapian.WritableDatabase("db",xapian.DB_CREATE_OR_OPEN)

db.add_synonym("Kfoo","Kbar")

db.commit();

qp = xapian.QueryParser()

qp.set_database(db);

# replacing add_prefix with add_boolean_prefix stops synonym expansion, tested with 1.2.21
qp.add_prefix("tag","K")

query=qp.parse_query("tag:foo",xapian.QueryParser.FLAG_AUTO_SYNONYMS)

print query;
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