Add new commands ZDIFF and ZDIFFSTORE (#7961)

- Add ZDIFF and ZDIFFSTORE which work similarly to SDIFF and SDIFFSTORE
- Make sure the new WITHSCORES argument that was added for ZUNION isn't considered valid for ZUNIONSTORE

Co-authored-by: Oran Agra <oran@redislabs.com>

1 files changed, 6 insertions, 8 deletions

diff --git a/redis.conf b/redis.conf
index a46668826..d28c17b64 100644
--- a/redis.conf
+++ b/redis.conf
@@ -901,14 +901,12 @@ acllog-max-len 128
 # Both LRU, LFU and volatile-ttl are implemented using approximated
 # randomized algorithms.
 #
-# Note: with any of the above policies, Redis will return an error on write
-#       operations, when there are no suitable keys for eviction.
-#
-#       At the date of writing these commands are: set setnx setex append
-#       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
-#       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
-#       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
-#       getset mset msetnx exec sort
+# Note: with any of the above policies, when there are no suitable keys for
+# eviction, Redis will return an error on write operations that require
+# more memory. These are usually commands that create new keys, add data or
+# modify existing keys. A few examples are: SET, INCR, HSET, LPUSH, SUNIONSTORE,
+# SORT (due to the STORE argument), and EXEC (if the transaction includes any
+# command that requires memory).
 #
 # The default is:
 #