SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal Array_[UInt64_3, UInt64_4, UInt64_5] (alias x)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function arrayElement (children 1)
       ExpressionList (children 2)
        Identifier x
        Literal UInt64_1
      Literal \'Int32\'
