SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayFold (children 1)
     ExpressionList (children 3)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier acc
          Identifier x
        Function plus (children 1)
         ExpressionList (children 2)
          Identifier acc
          Function multiply (children 1)
           ExpressionList (children 2)
            Identifier x
            Literal UInt64_2
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'[1, 2, 3, 4]\'
        Literal \'Array(Nullable(Int64))\'
      Function toInt64 (children 1)
       ExpressionList (children 1)
        Literal UInt64_3
