RangeTblEntry jumble omissions

I think there are some fields from the RangeTblEntry struct missing in 
the jumble (function _jumbleRangeTblEntry()).  Probably, some of these 
were really just forgotten, in other cases this might be an intentional 
decision, but then it might be good to document it.  This has come up in 
thread [0] and there is a patch [1], but I figured I'd start a new 
thread here to get the attention of those who know more about 
pg_stat_statements.

I think the following fields are missing.  (See also attached patch.)

- alias

Currently, two queries like

SELECT * FROM t1 AS foo
SELECT * FROM t1 AS bar

are counted together by pg_stat_statements -- that might be ok, but they 
both get listed under whichever one is run first, so here if you are 
looking for the "AS bar" query, you won't find it.

- join_using_alias

Similar situation, currently

SELECT * FROM t1 JOIN t2 USING (a, b)
SELECT * FROM t1 JOIN t2 USING (a, b) AS x

are counted together.

- funcordinality

This was probably just forgotten.  It should be included because the 
WITH ORDINALITY clause changes the query result.

- lateral

Also probably forgotten.  A query specifying LATERAL is clearly 
different from one without it.

Thoughts?  Anything else missing perhaps?


[0]: 
https://www.postgresql.org/message-id/flat/4b27fc50-8cd6-46f5-ab20-88dbaadca645@eisentraut.org
[1]: 
https://www.postgresql.org/message-id/attachment/154249/v2-0002-Remove-custom-_jumbleRangeTblEntry.patch