SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function if (alias k) (children 1)
     ExpressionList (children 3)
      Function notEquals (children 1)
       ExpressionList (children 2)
        Identifier s
        Literal \'\'
      Literal Tuple_(UInt64_1, UInt64_2)
      Literal Tuple_(UInt64_0, UInt64_0)
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier k
