docs: def schema_columns(self):
          """Return column informatino only from this schema"""
          t = self.schema_term
  
          columns = []
  
  
          if t:
              for i, c in enumerate(t.children):
  
                  if c.term_is("Table.Column"):
                      p = c.all_props
                      p['pos'] = i
                      p['name'] = c.value
                      p['header'] = self._name_for_col_term(c, i)
                      
  
                      columns.append(p)
  
          return columns