Node_Name comments

1. CREATE TABLE ... TO node or group
   --> What if [TO ...] clause is omitted.

2. CREATE NODE ... Preferred
   --> "Preferred" is not a node attribute.   Preferred node is an attribute of a coordinator.

3. Node (coordinator/data node) and node member
   --> Node consists of one ore more than one member.   One of them must be the master (or root master).   The other members should be slaves.   A member, which is not the root master, is a slave of another member.   The master (member A) of a member can be a slave of another master if and only if member A is not the root master.