limit 100

This increases the limit to the number of columns allowed in an sqlite table. Rather than 10 (introduced in 74fb01ec5aa5d1382b4ed4cc8e49913d5e423aa6), it's now 100. Considerations about the nebulous/delicate/qualitative balance between speed optimizations and limitations like this should probably be thought about in the broader context of CEP 17. @rwcarlsen has a lot of knowledge at this point about which optimizations have how much benefit, so I imagine discussion on this topic will be well informed.