96 struct FileMetaData {  struct
97   FileDescriptor fd;
98   InternalKey smallest;            // Smallest internal key served by table
99   InternalKey largest;             // Largest internal key served by table
102   Cache::Handle* table_reader_handle = nullptr;
104   FileSampledStats stats;
111   uint64_t compensated_file_size = 0;
114   uint64_t num_entries = 0;     // the number of entries.
115   uint64_t num_deletions = 0;   // the number of deletion entries.
116   uint64_t raw_key_size = 0;    // total uncompressed key size.
117   uint64_t raw_value_size = 0;  // total uncompressed value size.
119   int refs = 0;  // Reference count
121   bool being_compacted = false;       // Is this file undergoing compaction?
122   bool init_stats_from_file = false;  // true if the data-entry stats of this
147   FileMetaData() = default;  argument
149   FileMetaData(uint64_t file, uint32_t file_path_id, uint64_t file_size,  in FileMetaData()  function
175   void UpdateBoundariesForRange(const InternalKey& start,  in UpdateBoundariesForRange()
191   uint64_t TryGetOldestAncesterTime() {  in TryGetOldestAncesterTime()
217   FileMetaData* file_metadata;  // Point to all metadata  argument