"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Tuesday, June 8, 2021, 甄明洋 <zhenmingyang@yeah.net> wrote:
>> Here is an example, which seems to be a problem of parsing, if format
>> string with FF and TZH:TZM, but the datetime string without fractional
>> seconds will cause parsing misalignment，
> Yes, with a template language this complex it is possible that invalid
> input will mis-parse instead of provoking an error. Use regexes if you
> need to validate the input format - all the parser should really be relied
> upon to do is take a valid input and convert it.
TBH, if we simply took away to_timestamp(), most users would be better off.
I do not think I've ever seen a single complaint about it that didn't
involve an input format that timestamp_in doesn't handle as well or
better.
to_timestamp with a normal-looking format is an antipattern. Just cast
the string to timestamp(tz), instead. Consider to_timestamp *only*
after you find that doesn't work.
regards, tom lane