Worth reading the thread, there are some good insights. It looks like he will be waiting on Postgres to take the initiative on implementing this before it makes it into a release.
Being able to do SELECT FROM WHERE in any order and allowing multiple WHEREs and AGGREGATE etc, combined with supporting trailing commas, makes copy pasting templating and reusing and code-generating SQL so much easier.
FROM table <-- at this point there is an implicit SELECT *
SELECT whatever
WHERE some_filter
WHERE another_filter <-- this is like AND
AGGREGATE something
WHERE a_filter_that_is_after_grouping <-- is like HAVING
ORDER BY ALL <-- group-by-all is great in engines that support it; want it for ordering too
...BigQuery supports GROUP BY ALL and it really cleans up lots of queries. E.g.
SELECT foo, bar, SUM(baz)
FROM x
GROUP BY ALL <-- equiv to GROUP BY foo, bar
(eh, except MySQL; my memory of MySQL is it will silently do ANY_VALUE() on any columns that aren't an explicit aggregate function but are not grouped; argh it was a long time ago)