message: add in tests for the new fields I added
diff: @@ -21,3 +21,13 @@ query I
  select distinct proname from pg_proc where proname='sqrt';
  ----
  sqrt
  +
  +query IIII
  +select proisagg, prorettype, proargtypes, proargnames FROM pg_proc WHERE proname='corr';
  +----
  +true DOUBLE [DOUBLE, DOUBLE] [col0, col1]
  +
  +query IIII
  +select provariadic, prorettype, proargtypes, proargnames FROM pg_proc WHERE proname='printf';
  +----
  +ANY VARCHAR [VARCHAR] [col0]
  