Tom Lane wrote:
> Bruce Momjian <bruce@momjian.us> writes:
> > I was wondering why we mark to_date() as stable and not immutable?
>
> Do you really want to guarantee that it isn't, and never will be,
> affected by timezone, datestyle, lc_time, etc? In particular it seems
> likely that somebody will eventually complain that since to_char can
> output localized month/day names according to lc_time, to_date should be
> able to read them.
>
> > Are there people using to_date in indexes or partition functions where
> > changing it to immutable would be useful?
>
> By definition, there are not, and I don't recall many complaints from
> people trying to. On the other hand, if we mark it immutable and then
> in future wish to go back to allowing environment dependencies, we will
> have to risk breaking working applications.
OK --- without user requests, it seems pointless to make a change here.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +