[DocDB] PITR - Single file compaction does not reset Hybrid Time filter set during restore

[sanketkedia]

Jira Link: DB-6496

Description

If there's only one input file for compaction then the output file generated by compaction still contains the hybrid time filter. It is not reset. This is because the largest and smallest frontiers are cloned as is from the first input file and then iterating over the subsequent input files, we update them. During update, we reset the filter. So if there's only one input file the filter is not reset.

for (size_t level_idx = 0; level_idx < compact_->compaction->num_input_levels(); level_idx++) {
    for (FileMetaData *fmd : *compact_->compaction->inputs(level_idx) ) {
      out.meta.UpdateBoundariesExceptKey(fmd->smallest, UpdateBoundariesType::kSmallest);
      out.meta.UpdateBoundariesExceptKey(fmd->largest, UpdateBoundariesType::kLargest);
    }
}

void UserFrontier::Update(const UserFrontier* rhs, UpdateUserValueType type, UserFrontierPtr* out) {
  if (!rhs) {
    return;
  }
  if (*out) {
    (**out).Update(*rhs, type);
  } else {
    *out = rhs->Clone();
  }
}

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