message: Silence some clang static analyzer false-positives
  CSE warns that `result_ndx` is uninitialized at the point of use due to that it
  can't see where the variable is assigned to.
diff: @@ -367,7 +367,7 @@ util::Optional<Mixed> Results::aggregate(size_t column,
  util::Optional<Mixed> Results::max(size_t column)
  {
  - size_t return_ndx;
  + size_t return_ndx = npos;
  auto results = aggregate(column, "max",
  [&](auto const& table) { return table.maximum_int(column, &return_ndx); },
  [&](auto const& table) { return table.maximum_float(column, &return_ndx); },
  @@ -378,7 +378,7 @@ util::Optional<Mixed> Results::max(size_t column)
  util::Optional<Mixed> Results::min(size_t column)
  {
  - size_t return_ndx;
  + size_t return_ndx = npos;
  auto results = aggregate(column, "min",
  [&](auto const& table) { return table.minimum_int(column, &return_ndx); },
  [&](auto const& table) { return table.minimum_float(column, &return_ndx); },
  