> On Oct 30, 2018, at 9:08 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
>
> On Tue, 30 Oct 2018 at 07:58, David Rowley <david.rowley@2ndquadrant.com> wrote:
>
> I've started working on something I've ended up calling "Super
> PathKeys". The idea here is to increase the likelihood of a Path with
> PathKeys being used for a purpose that requires a less strict sort
> order due to ordering being required from the return value of some
> precision loss function.
>
> Anything left anchored would benefit, so SUBSTR(), TRIM() etc
>
> Main use for this would be where the partition condition is a function, so we can still order by partitions easily.
This would also be very helpful in many BI cases; it’s very common to aggregate based on year, year/month,
year/quarter,etc.
The other thing that would be extremely useful would be pushing predicats through this, so you could do things like
WHERE date_trunc(‘year’, timestamp_field) = 2018