//  Copyright (c) 2016-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

#pragma once

struct CompactionIterationStats {
  // Compaction statistics

  // Doesn't include records skipped because of
  // CompactionFilter::Decision::kRemoveAndSkipUntil.
  int64_t num_record_drop_user = 0;

  int64_t num_record_drop_hidden = 0;
  int64_t num_record_drop_obsolete = 0;
  int64_t num_record_drop_range_del = 0;
  int64_t num_range_del_drop_obsolete = 0;
  // Deletions obsoleted before bottom level due to file gap optimization.
  int64_t num_optimized_del_drop_obsolete = 0;
  uint64_t total_filter_time = 0;

  // Input statistics
  // TODO(noetzli): The stats are incomplete. They are lacking everything
  // consumed by MergeHelper.
  uint64_t num_input_records = 0;
  uint64_t num_input_deletion_records = 0;
  uint64_t num_input_corrupt_records = 0;
  uint64_t total_input_raw_key_bytes = 0;
  uint64_t total_input_raw_value_bytes = 0;

  // Single-Delete diagnostics for exceptional situations
  uint64_t num_single_del_fallthru = 0;
  uint64_t num_single_del_mismatch = 0;
};