SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal \'ghj\'
          Function array (children 1)
           ExpressionList (children 1)
            Function tuple (children 1)
             ExpressionList (children 2)
              Literal \'klm\'
              Literal Array_[UInt64_16, UInt64_17]
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal \'nop\'
          Function array (children 1)
           ExpressionList (children 1)
            Function tuple (children 1)
             ExpressionList (children 2)
              Literal \'rst\'
              Literal Array_[UInt64_18]
      Literal \'Map(String, Map(String, Array(UInt8)))\'
