Hi Joseph, Herman,
thanks for your answers. The specific rule I was looking at
is FoldablePropagation. If you look at it, what is done is that first a
AttributeMap containing all the possible foldable alias is collected, then
they are replace in the whole plan (it is a bit more complex than this,
Is there some transformation we'd want to apply to that tree, but can't
because we have no concept of scope? It's already possible for a plan rule
to traverse each node's subtree if it wants.
On Tue, Apr 24, 2018 at 10:18 AM, Marco Gaido
wrote:
> Hi all,
>
> working on SPARK-24051 I realized tha
