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
        Identifier x
      Function emptyArrayString (children 1)
       ExpressionList
      Function toInt8 (children 1)
       ExpressionList (children 1)
        Literal UInt64_0
