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From Ashutosh Chauhan <>
Subject Re: Adding Exchange operator and Distribution trait
Date Thu, 12 Feb 2015 02:47:25 GMT
I think RelDistribution as a member of Exchange (as in Julian proposal)
makes more sense as compared to mine at field level.

On Wed, Feb 11, 2015 at 6:42 PM, Jacques Nadeau <> wrote:

> Does RelMdDistribution exist or as theory?
> Definitely inclined to "Exchange" over "Shuffle" as more generic/consistent
> with Volcano.
> Note, looking at Ashutosh I wonder a little about the need to have range
> versus hash at the field information level.  I'm sure we can come up with a
> use case but it seems to overcomplicate.  We already have space exploration
> problems when trying to do distribution subsumption for joins with trait
> propagation so I would be cautious about adding more dimensions to that
> attribute.

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