Option: Cache crosscat_cc_colno and bayesdb_generator_column_stattype

[axch]

to avoid spamming the sqlite queries they always call. Don't know how big an issue this actually is.

[riastradh-probcomp]

Why performance? What makes these queries spam?

[axch]

The functions are just called a lot, and generate large numbers of small queries in the sql trace. I generally assume that sql queries are mildly expensive; I have no particular evidence that this is a problem. Feel free to close the issue if you don't think we should remember this explicitly.

[gregory-marton]

Good next step might be a quick profile to see what these calls cost? Perhaps sqlite already caches them, at some level?

[riastradh-probcomp]

Yes and could be.