Subject scalable joins
Author paulruizendaal
Hi all,

highscalability has some interesting write-up about google app engine
and its datastore. One blogger is quite disappointed with its

Google has this post:

It makes a bold statement:
"This isn't an accident -- when you build a system that can scale to
the size that Bigtable can there's no way to do a general purpose
join on data sets that size and still have them be performant."

Now my question is whether this is true: is it mathematically
impossible to do distributed joins in a generalized way?

Any ideas anyone?