Can we use generators for selects?

[JakeRoggenbuck]

[JakeRoggenbuck]

Yield is actually just set with a bit flag for the FFI. If Py03 doesn't support yield, we could set the bits ourselves. This is definitely the lowest part of the python FFI performance iceberg.

[JakeRoggenbuck]

We definitely benefit from the stack frame not being created and freed every time. This means that the data like the projected columns (probably) doesn't get reinitialized, or at least doesn't get moved to the newly allocated stack frame

[JakeRoggenbuck]

We don't often return many things from a single select yet