Re: Index Skip Scan

On Mon, Mar 9, 2020 at 3:56 PM Dmitry Dolgov <9erthalion6@gmail.com> wrote:
>
> Assuming we'll implement it in a way that we do not know about what kind
> of path type is that in create_distinct_path, then it can also work for
> ProjectionPath or anything else (if UniqueKeys are present). But then
> still EquivalenceMember are used only to figure out correct
> distinctPrefixKeys and do not affect whether or not skipping is applied.
> What do I miss?


Part of the puzzle seems to me to this part of the response:

> I think the UniqueKeys may need to be changed from using
> EquivalenceClasses to use Exprs instead.

But I can't say I'm being overly helpful by pointing that out, since I
don't have my head in the code enough to understand how you'd
accomplish that :)