SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier mem4 (alias t1)
     TableJoin (children 1)
      ExpressionList (children 2)
       Identifier k1
       Identifier k2
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier mem4 (alias t2)
     TableJoin (children 1)
      ExpressionList (children 2)
       Identifier k1
       Identifier k2
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier tab.v
