Zabbix

A......... [ZBX-20186] fixed incorrect count of result rows reported by API

* commit 'e1083cf6f1993ea6f0285a084ce08e28d9c19616':
  A......... [ZBX-20186] removed DISTINCT from sql queries with aggregations
  A......... [ZBX-20186] fixed processing of composite keys in the CApiService class
  A......... [ZBX-20186] removed specific DISTINCT syntax for multi-field PKs; added exception for joins with multi-field PK tables
  A......... [ZBX-20186] moved specific DISTINCT syntax to DB class; changed approach to avoid duplicate DISTINCT on count-queries, DISTINCT on compound PKs
  A......... [ZBX-20186] added changelog entry
  A......... [ZBX-20186] added Oracle syntax for count on distinct with multiple fields; fixed repeated distinct on count-queries
  A......... [ZBX-20186] apply distinct for count on compound primary keys