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From Ted Dunning <>
Subject Re: Tiles & Lattice HOWTO
Date Tue, 05 May 2015 02:19:15 GMT
On Mon, May 4, 2015 at 11:13 PM, Julian Hyde <> wrote:

> Your definition of a schema as a set of possible queries and the "can
> be answered using" mathematical relation is a generalization of mine,
> but I claim it is less useful. My lattice is defined structurally. It
> only deals with filter-join-aggregate queries. Queries of this kind
> are really important for interactive DW, and focusing on this kind of
> queries makes the recommendation & matching algorithms tractable.

Actually, that wasn't my definition of a schema.  That was my definition of
the lattice in question.

And I was expecting to restrict the discussion to the queries that you are
talking about.

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