AlterQuery  alter_test (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration b (children 1)
    Function plus (children 1)
     ExpressionList (children 2)
      Function now (children 1)
       ExpressionList
      Literal UInt64_1
 Identifier alter_test
