Ferret crashes with multi boolean query

[lsansonetti@…]

I have a full reproducible Ferret crash. My environment is Mac OS X 10.4, and I reproduce the crash with various versions of Ruby (1.8.4 and 1.8.6).

$ cat /tmp/foo.rb

#!/usr/bin/ruby

require 'rubygems'
require 'ferret'

index = Ferret::Index::Index.new()

index << {:id => 1, :title => "foo", :content => "Do you want to quit?"}

index.search_each('content:"Do|you|want|to|stop"') do |id, score, title|
end

$ ruby /tmp/foo.rb
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/ferret-0.11.4/lib/ferret/index.rb:384: [BUG] Bus Error
ruby 1.8.6 (2007-03-13) [universal-darwin9.0]

Abort trap

$ gdb --args !!
[...]
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x0000000c
0x005d92c0 in bq_rewrite (self=0x390360, ir=0x38f000) at q_boolean.c:1363
1363	        Query *rq = clause->query->rewrite(clause->query, ir);
(gdb) bt
#0  0x005d92c0 in bq_rewrite (self=0x390360, ir=0x38f000) at q_boolean.c:1363
#1  0x005fa75e in isea_rewrite (self=0x38fdc0, original=0x390360) at search.c:1155
#2  0x005f9941 in q_weight (self=0x390360, searcher=0x38fdc0) at search.c:355
#3  0x005f9c10 in isea_search (self=0x38fdc0, query=0x0, first_doc=0, num_docs=0, filter=0x0, sort=0x0, filter_func=0, load_fields=0) at search.c:1110
#4  0x005f432f in frt_sea_search_internal (query=0x390360, roptions=5273020, sea=0x38fdc0) at r_search.c:2531
#5  0x005f43bb in frt_sea_search_each (argc=0, argv=0x0, self=0) at r_search.c:2628

[dbalmain]

Reformatted ticket to syntax highlight correctly.

[dbalmain]

Fixed. Problem was caused by removing stopwords from a multi term query so that leaving the resulting boolean query with null clauses. I've actually changed the code to use the more efficient MultiTermQuery?, although the speed difference will be negligible.