Test on joins

To hit on the issue just fixed.

test/people_join_personroom.result

@@ -0,0 +1,9 @@
+id,name,chief,age,room
+0,jack,0,22,1
+1,carl,0,20,4
+2,john,1,30,2
+3,dean,1,33,2
+4,eve,0,25,5
+5,duncan,4,30,1
+6,paul,4,30,5
+7,alia,1,28,1