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.
RESP2/RESP3 Reply
Simple string reply:OK.