On Sun, Jun 13, 2021 at 11:25:05AM -0400, Jonathan S. Katz wrote: > On 6/13/21 10:57 AM, Zhihong Yu wrote: > > +/* Turn multirange into a set of ranges */ > > > > set of ranges: sequence of ranges > > I believe "set of ranges" is accurate here, as the comparable return is > a "SETOF rangetype". Sequences are objects unto themselves. >
I believe the point was that (in mathematics) a "set" is unordered, and a sequence is ordered. Also, a "setof" tuples in postgres can contain duplicates. The docs say "The ranges are read out in storage order (ascending).", so I think this is just a confusion between what "set" means in math vs in postgres. In postgres, "sequence" usually refers to the object that generarates a sequence: | CREATE SEQUENCE creates a new sequence number generator. -- Justin
