initial implementation for randomsubset from multiple keys

Author: Kaan Ozdokmeci

src/srandsubsetfrommulti.lua

@@ -0,0 +1,13 @@
+local main_key = KEYS[1]
+local from = tonumber(ARGV[1])
+local to = tonumber(ARGV[2])
+local amount = tonumber(ARGV[3])
+local final_set = {}
+
+for counter = from, to do
+  for k,v in pairs(redis.call('evalsha','bd8d94deaa1113ee0c1beae00bab6de0cc88be89',1,main_key .. counter,tostring(amount))) do
+     final_set[#final_set+1] = v
+  end
+end
+
+return final_set