Hi,

Please find below the reproducer details with the examples.

Complex filter example:

"(&(&(uid=test1)(cn=t1 est))(&(gidnumber=20))(uidnumber=2558)(&(sn=est)))"

In the above filter as you can see, the "uidnumber=2558" sub filter is not associated with ant Boolean operator ( AND or OR or NOT) which results in missing this sub filter from the filter after decoding process. The error log details are given below.

[23/Sep/2013:04:42:58 +051800] index_subsys_assign_filter_decoders - before: (&(&(uid=test1)(cn=t1 est))(&(gidNumber=20))(uidNumber=2558)(&(sn=est)))

The index subsystem takes the complex filter as argument for the decoding.
[23/Sep/2013:04:42:58 +051800] - slapi_filter_free type 0xA0
[23/Sep/2013:04:42:58 +051800] - slapi_filter_free type 0xA0
[23/Sep/2013:04:42:58 +051800] - slapi_filter_free type 0xA0
=====
[23/Sep/2013:04:42:58 +051800] index_subsys_assign_filter_decoders - after: (&(uid=test1)(cn=t1 est)(gidNumber=20)(sn=est))
=====
After decoding as you can see in the above line, the "uidnumber=2558" is missing which is not going to be considered during the database search.

Here, as the whole of complex filter is preceded by a outer "&" operator, Why the sub filter in this case is being ignored from the search request?.