SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier t2.x
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1 (alias t0)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t1 (alias t2)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.x
        Identifier t2.x
   ExpressionList (children 1)
    Identifier t1.x
