MongoDB: skip system collections when loading schema. (#2961)
MongoDB: skip system collections when loading schema. (#2961)


chriszs/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash,chriszs/redash,getredash/redash,getredash/redash,chriszs/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash,denisov-vlad/redash,denisov-vlad/redash,getredash/redash,getredash/redash,getredash/redash,chriszs/redash,denisov-vlad/redash