SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1_00826 (alias x)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t1_00826 (alias y)
     TableJoin
   Function and (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier x.a
       Identifier y.a
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier x.b
       Identifier y.b
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier x.a
