> On Oct 30, 2018, at 9:08 AM, Simon Riggs <si...@2ndquadrant.com> wrote: > > On Tue, 30 Oct 2018 at 07:58, David Rowley <david.row...@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
