AlterQuery  null_00557 (children 2)
 ExpressionList (children 2)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration y (children 1)
    DataType String
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration x (children 2)
    DataType Int64
    Function toInt64 (children 1)
     ExpressionList (children 1)
      Identifier y
 Identifier null_00557
