[ldb] [PATCH] LDB_SCOPE_ONELVEL indexing

[tridge at samba.org]

Simo,

 > This patch implements indexing for one level searches but only if
 > explicitly activated by adding an attribute called @IDXONE to the
 > @INDEXLIST special object.

This certainly ended up a lot simpler than I expected!

A few things could be improved though. The ldb_msg_find_idx() calls
for LTDB_IDXONE seem a bit silly. I think a flag in ltdb->cache makes
more sense.

I also think we could get rid of the ltdb_index_dn_one() function,
which is the most complex function in the patch. Instead, we could do
the onelevel indexing before the attribute indexing in
ltdb_search_indexed(), and call ltdb_index_dn_and(). 

Cheers, Tridge