code: func (c *ColumnMap) SetSqlType(t string) *ColumnMap {
  	c.sqltype = t
  	return c
  }
docs: // SetSqlType sets an override for the column's sql type.  This is a string,
  // such as 'varchar(32)' or 'text', which will be used by CreateTable and
  // nothing else.  It is the caller's responsibility to ensure this will map
  // cleanly to the underlying struct field via rows.Scan