DISCARD
Syntax
        DISCARD
- Available since:
- 2.0.0
- Time complexity:
- O(N), when N is the number of queued commands
- ACL categories:
- 
              
                @fast,@transaction,
Flushes all previously queued commands in a transaction and restores the connection state to normal.
If WATCH was used, DISCARD unwatches all keys watched by the connection.
Return
Simple string reply: always OK.