Implementing reverse sort

[denglert]

While trying to reverse sort a hv.Points object I came across there is no reverse sort implemented in hv.
https://github.com/ioam/holoviews/blob/master/holoviews/core/data/__init__.py#L206

Would be nice to see something like:
hv.Points.sort('z', reverse=True)

[philippjfr]

Thanks for filing this. It should be fairly straightforward since only columnar interfaces have to support this.

[jlstevens]

Generalizing sort seems like a reasonable request - maybe in addition to reverse we could offer a comparison function to allow custom sorting?

[philippjfr]

That should be straightforward enough for one column, not quite clear to me how that would work when you sort over multiple columns at once, but I think it makes sense.

[philippjfr]

Going to close as reverse sort has been implemented and I think providing a sort function is out of scope, especially as I can't see how it would work.