Tom Lane wrote:
> I don't necessarily have an opinion yet. I would like to see more than
> just an unsupported assertion about what Oracle's behavior is. Also,
> how should FM mode affect this?
I can supply what Oracle 12.1 does:
SQL> SELECT to_timestamp('2016-06-13 15:43:36', ' YYYY/MM/DD HH24:MI:SS') AS ts FROM dual;
TS
--------------------------------
2016-06-13 15:43:36.000000000 AD
SQL> SELECT to_timestamp('2016-06-13 15:43:36', 'YYYY/MM/DD HH24:MI:SS') AS ts FROM dual;
TS
--------------------------------
2016-06-13 15:43:36.000000000 AD
SQL> SELECT to_timestamp('2016-06-13 15:43:36', 'YYYY/MM/DD HH24:MI:SS') AS ts FROM dual;
TS
--------------------------------
2016-06-13 15:43:36.000000000 AD
(to_timestamp_tz behaves the same way.)
So Oracle seems to make no difference between one or more spaces.
Yours,
Laurenz Albe