Slapd generate SQL by PostgreSQL based syntax

Hi

I use openldap slapd 2.4.40 + MySQL5.5 as back-sql on CentoS 6.9

It seems slapd generate PostgreSQL based syntax SQL

Here is the error message for ldapsearch -x -b "dc=example,dc=com" '(objectClass=*)'

5b70e25c <==backsql_srch_query() returns SELECT DISTINCT ldap_entries.id,eduperson.id,text('inetOrgPerson') AS objectClass,ldap_entries.dn AS dn FROM ldap_entries,eduperson WHERE eduperson.id=ldap_entries.keyval AND ldap_entries.oc_map_id=? AND 9=9 AND 3=3 5b70e25c Constructed query: SELECT DISTINCT ldap_entries.id,eduperson.id,text('inetOrgPerson') AS objectClass,ldap_entries.dn AS dn FROM ldap_entries,eduperson WHERE eduperson.id=ldap_entries.keyval AND ldap_entries.oc_map_id=? AND 9=9 AND 3=3 5b70e25c id: '3' 5b70e25c backsql_oc_get_candidates(): error executing query 5b70e25c Return code: -1 5b70e25c nativeErrCode=1064 SQLengineState=37000 msg="[unixODBC][MySQL][ODBC 5.1 Driver][mysqld-5.5.57]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '('inetOrgPerson') AS objectClass,ldap_entries.dn AS dn FROM ldap_entries,edupers' at line 1" 5b70e25c send_ldap_result: conn=1000 op=1 p=3 5b70e25c send_ldap_result: err=80 matched="" text="" 5b70e25c send_ldap_response: msgid=2 tag=101 err=80

I take same message as I execute below from MySQL console.

I can see text('inetOrgPerson') in the SQL which was generated by slapd however,MySQL doesn’t support text() function in its SQL.

When I use Postgeresql as back-sql it works properly Is it a bug or setting error for some directives?

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