[Xapian-discuss] Phrase query problem with python api

[Richard Boulton]

Victor Ng wrote:
> line 473, in __init__
>    _xapian.Query_swiginit(self,_xapian.new_Query(*args))
> RuntimeError: unknown error in Xapian
> 
> 
> Aren't PHRASE queries allowed to take arbitrary subqueries or does it
> only allow some kinds of subqueries?

PHRASE queries aren't allowed to contain subqueries which are PHRASE or 
NEAR subqueries.  In SVN Xapian, the exception message from your code is 
more helpful:

xapian.UnimplementedError: Can't use NEAR/PHRASE with a subexpression 
containing NEAR or PHRASE

Actually, if I recall correctly, NEAR and PHRASE pretty much only accept 
single-term subqueries currently, though I may be out of date on this 
point.  I've never needed to perform these kinds of queries - if you can 
find examples of real-world queries which need support for this, it 
might encourage someone to develop support for it sooner rather than later.

-- 
Richard