SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier mem3 (alias t1)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier k1
        Identifier t1.k
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier mem3 (alias t2)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier k2
        Identifier t2.k
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier tab.v
   Set
