SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Identifier id
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier join_on_disk (alias lhs)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias rhs) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Identifier id
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier join_on_disk
          ExpressionList (children 1)
           Identifier id
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier id
 Identifier Null