SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test1 (alias test2.a)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier test2 (alias test2.a)
     TableJoin
