code: def maybe_set_size(self, min_itemsize=None):
          
          if _ensure_decoded(self.kind) == 'string':
  
              if isinstance(min_itemsize, dict):
                  min_itemsize = min_itemsize.get(self.name)
  
              if min_itemsize is not None and self.typ.itemsize < min_itemsize:
                  self.typ = _tables(
                  ).StringCol(itemsize=min_itemsize, pos=self.pos)
docs: maybe set a string col itemsize:
                 min_itemsize can be an integer or a dict with this columns name
                 with an integer size