message: Comment about removing checks when certain columns/features are unused
diff: @@ -455,6 +455,11 @@ of the runtime table.
  This results in 5 new checks, and the removal of 1 old check.
  +The lookup permutation argument (and its columns) can be elided when it is
  +unused by either the side-loaded table or the runtime table. Similarly, the
  +runtime table checks (and columns) can be omitted when there is no runtime
  +table.
  +
  ## Drawbacks
  [drawbacks]: #drawbacks
  