On Thu, Apr 8, 2021 at 10:24 AM Bruce Momjian <bruce@momjian.us> wrote:
On Mon, Apr 5, 2021 at 02:01:58PM -0400, Bruce Momjian wrote: > On Mon, Apr 5, 2021 at 11:33:10AM -0500, Justin Pryzby wrote: > Well, bug or not, we are not going to change back branches for this, and > if you want a larger discussion, it will have to wait for PG 15. > > > > https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-INPUT > > > « …field values can have fractional parts; for example '1.5 week' or '01:02:03.45'. Such input is converted to the appropriate number of months, days, and seconds for storage. When this would result in a fractional number of months or days, the fraction is added to the lower-order fields using the conversion factors 1 month = 30 days and 1 day = 24 hours. For example, '1.5 month' becomes 1 month and 15 days. Only seconds will ever be shown as fractional on output. » > > I see that. What is not clear here is how far we flow down. I was > looking at adding documentation or regression tests for that, but was > unsure. I adjusted the docs slightly in the attached patch.
Here is an updated patch, which will be for PG 15. It updates the documentation to state:
The fractional parts are used to compute appropriate values for the next lower-order internal fields (months, days, seconds).
It removes the flow from fractional months/weeks to hours-minutes-seconds, and adds missing rounding for fractional computations.
