SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier y
    Function throwIf (children 1)
     ExpressionList (children 1)
      Function not (children 1)
       ExpressionList (children 1)
        Function less (children 1)
         ExpressionList (children 2)
          Identifier y
          Literal UInt64_5
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier default_constraints