SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function first_value_respect_nullsMerge (children 1)
     ExpressionList (children 1)
      Identifier t
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function first_value_respect_nullsState (alias t) (children 1)
            ExpressionList (children 1)
             Function CAST (children 1)
              ExpressionList (children 2)
               Literal NULL
               Literal \'Nullable(UInt8)\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers (children 1)
              ExpressionList (children 1)
               Literal UInt64_5
