optd

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- [ ] plan nodes - [ ] rules - [ ] datafusion executors - [ ] runtime data collection

skyzh

I don't think this task is important because I don't see physical properties very useful when evaluating Datafusion. Sometime later, we should add physical property support for the optimizer framework.

skyzh

currently, we do not compute upper bound / lower bound for the pruning process. we simply explore the full logical plan space and compute a winner for the physical plan....

skyzh

Related: #11, #68, #127 Ran with no datafusion optimizations (all of our own optimizations), on the subquery unnesting branch (`bowad/subquery-unnest`) Tests were done for whether or not the query works...

jurplel