Ferret talk - Aug 2006 - too many clauses exception

hey..

i get this error quite regularly, what exactly dies it mean?

  : Error occured at <q_prefix.c>:54
Error: exception 6 not handled: Too many clauses

am i adding to many clauses in the query statement? 

Ben

On Wed, Aug 02, 2006 at 11:40:28AM +0200, Benjamin Krause
wrote:
> hey..
> 
> i get this error quite regularly, what exactly dies it mean?
> 
>   : Error occured at <q_prefix.c>:54
> Error: exception 6 not handled: Too many clauses
> 
> am i adding to many clauses in the query statement? 
this can happen with wild card queries, which can result in 
lots of Boolean clauses, i.e. searching for A* will give a booleanquery
having a clause for every term in your index that starts with
''A''.

You can override the default limit of 1024 by setting the
max_clause_count variable in the boolean query in question (difficult if
the query is generated by the query parser, in that case you could
override BooleanQuery#max_clause_count to return a higher value).

Jens


-- 
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Dipl.-Wirtschaftsingenieur Jens Kr?mer       kraemer at webit.de
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On 8/2/06, Jens Kraemer <kraemer at webit.de>
wrote:
> On Wed, Aug 02, 2006 at 11:40:28AM +0200, Benjamin Krause wrote:
> > hey..
> >
> > i get this error quite regularly, what exactly dies it mean?
> >
> >   : Error occured at <q_prefix.c>:54
> > Error: exception 6 not handled: Too many clauses
> >
> > am i adding to many clauses in the query statement?
>
> this can happen with wild card queries, which can result in
> lots of Boolean clauses, i.e. searching for A* will give a booleanquery
> having a clause for every term in your index that starts with
''A''.
>
> You can override the default limit of 1024 by setting the
> max_clause_count variable in the boolean query in question (difficult if
> the query is generated by the query parser, in that case you could
> override BooleanQuery#max_clause_count to return a higher value).
>
> Jens
In future these queries will be rewritten to MultiTermQueries which
have much better performance than BooleanQueries. You still have the
same problem though. You''ll need to set the max_term_count. There will
be a :max_term_count parameter on the QueryParser also.

Dave