SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function CAST (alias id) (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Literal \'Nullable(UInt8)\'
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier id
     Function CAST (children 1)
      ExpressionList (children 2)
       Literal UInt64_1
       Literal \'Nullable(UInt8)\'