InsertQuery   (children 3)
 Function file (children 1)
  ExpressionList (children 1)
   Function concat (children 1)
    ExpressionList (children 2)
     Function currentDatabase (children 1)
      ExpressionList
     Literal \'_data_02302.arrow\'
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 2)
     Literal UInt64_1 (alias x)
     Function CAST (alias xx) (children 1)
      ExpressionList (children 2)
       Literal NULL
       Literal \'Nullable(UInt8)\'
    Set
 Set
