class OCI8::Metadata::Table

def clustered?

Otherwise, +false+.
cluster[http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/schema.htm#CNCPT608].
Returns +true+ if the table is part of a 
def clustered?
  attr_get_ub1(OCI_ATTR_CLUSTERED) != 0
end