pcache LDAP_MATCHING_RULE_IN_CHAIN support

Hello all,

We have an OpenLDAP instance proxying an active directory with back_meta and mr_passthru. We also have pcache on top, and as it do not support LDAP_MATCHING_RULE_IN_CHAIN, I looked about implementing it.

I found that we could retrieve cached results with pcacheQueryID, but I can't get why this is not used in the current code?

I dit it this way (querying pcacheQueryID for previsouly cached results) and tests are successful

I can now declare templates like this : pcacheAttrset 0 * pcacheTemplate (&(objectClass=)(member:1.2.840.113556.1.4.1941:=)) 0 900

Plesae see attached patch

Did I miss something about the use of pcacheQueryID ? or anything else ? Do you think this could be added upstream?

P.S.: Is there a reason mr_passthru is not included to OpenLDAP ? not even in contrib ?

Thanks for reading