t1: relation_id: 1 k: 'test' v: 'yes' t2: relation_id: 2 k: 'test' v: 'yes' t3: relation_id: 3 k: 'test' v: 'yes' mt_1: relation_id: 4 k: 'tag1' v: 'val1' mt_2: relation_id: 4 k: 'tag2' v: 'val2' mt_3: relation_id: 4 k: 'tag3' v: 'val3' mt_4: relation_id: 4 k: 'tag4' v: 'val4'