SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function or (children 1)
     ExpressionList (children 3)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier k
        Literal UInt64_2
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier k
        Literal UInt64_1
      Function equals (children 1)
       ExpressionList (children 2)
        Function or (children 1)
         ExpressionList (children 2)
          Literal NULL
          Literal UInt64_1
        Identifier k
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1 (alias k)
