(ITS#5521) Can't change indexing of an attribute within a single modification

[rhafer@suse.de]

Full_Name: Ralf Haferkamp
Version: HEAD, RE24
OS: 
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (85.8.89.54)


The following modification to add an additional index an attribute fails with
the error messages pasted below:

--------------------------
dn: olcDatabase={1}bdb,cn=config
changetype: modify
delete: olcdbindex
olcDbIndex: cn pres,eq
-
add: olcdbindex
olcDbIndex: cn pres,eq,sub
--------------------------

modifying entry "olcDatabase={1}bdb,cn=config"
ldap_modify: Other (e.g., implementation specific) error (80)
        additional info: <olcDbIndex> handler exited with 1

As far as I can see it fails because the old indexmask hat not yet been deleted
from the bdb-struct. The ainfo_insert()-call in
back-bdb/attr.c(bdb_attr_index_config()) returns with -1.

Splitting the above modification in two separate operations works around that
problem.