[Developers] SQL over MQL

[John V. Sichi]

Scott Meyers wrote:
> That's fantastic!  We've kicked around the idea here at Metaweb but
> no one's had the time to do anything about it.
> 
> It looks like you're mapping types directly to tables.  Do you map
> SQL joins into MQL or are you doing the joins in the client?

For the first cut, I only implemented projection and filter pushdown, so 
  currently joins are processed in the client.

Simple join pushdown could be added to the plugin in its current form by 
just hooking in some more direct-translation rules.  A serious optimizer 
would need more work, including transformations over a physical algebra 
corresponding to MQL structures.

JVS