AlterQuery  tmp (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration s (children 2)
    DataType String
    Function toString (children 1)
     ExpressionList (children 1)
      Function plus (children 1)
       ExpressionList (children 2)
        Identifier x
        Literal UInt64_3
 Identifier tmp