typedef struct SSTableVersion {
char dbFName[TSDB_DB_FNAME_LEN];
char stbName[TSDB_TABLE_NAME_LEN];
uint64_t dbId;
uint64_t suid;
int16_t sversion;
int16_t tversion;
int32_t smaVer;
} SSTableVersion;
it is used in ctgUpdateRentStbVersion to update super table version . but what is the version used for ?