diff options
Diffstat (limited to 'sql/handler.h')
| -rw-r--r-- | sql/handler.h | 49 |
1 files changed, 38 insertions, 11 deletions
diff --git a/sql/handler.h b/sql/handler.h index ee730e8a725..27e38e9c36f 100644 --- a/sql/handler.h +++ b/sql/handler.h @@ -116,7 +116,13 @@ enum enum_alter_inplace_result { #define HA_NO_BLOBS (1ULL << 9) /* Doesn't support blobs */ #define HA_CAN_INDEX_BLOBS (1ULL << 10) #define HA_AUTO_PART_KEY (1ULL << 11) /* auto-increment in multi-part key */ -#define HA_REQUIRE_PRIMARY_KEY (1ULL << 12) /* .. and can't create a hidden one */ +/* + The engine requires every table to have a user-specified PRIMARY KEY. + Do not set the flag if the engine can generate a hidden primary key internally. + This flag is ignored if a SEQUENCE is created (which, in turn, needs + HA_CAN_TABLES_WITHOUT_ROLLBACK flag) +*/ +#define HA_REQUIRE_PRIMARY_KEY (1ULL << 12) #define HA_STATS_RECORDS_IS_EXACT (1ULL << 13) /* stats.records is exact */ /* INSERT_DELAYED only works with handlers that uses MySQL internal table @@ -300,10 +306,19 @@ enum enum_alter_inplace_result { #define HA_CAN_MULTISTEP_MERGE (1LL << 53) /* calling cmp_ref() on the engine is expensive */ -#define HA_CMP_REF_IS_EXPENSIVE (1ULL << 54) +#define HA_SLOW_CMP_REF (1ULL << 54) +#define HA_CMP_REF_IS_EXPENSIVE HA_SLOW_CMP_REF + +/** + Some engines are unable to provide an efficient implementation for rnd_pos(). + Server will try to avoid it, if possible + + TODO better to do it with cost estimates, not with an explicit flag +*/ +#define HA_SLOW_RND_POS (1ULL << 55) -/* Engine wants primary keys for everything except sequences */ -#define HA_WANTS_PRIMARY_KEY (1ULL << 55) +/* Safe for online backup */ +#define HA_CAN_ONLINE_BACKUPS (1ULL << 56) /* bits in index_flags(index_number) for what you can do with index */ #define HA_READ_NEXT 1 /* TODO really use this flag */ @@ -418,6 +433,12 @@ enum enum_alter_inplace_result { #define HA_KEY_NULL_LENGTH 1 #define HA_KEY_BLOB_LENGTH 2 +/* Maximum length of any index lookup key, in bytes */ + +#define MAX_KEY_LENGTH (MAX_DATA_LENGTH_FOR_KEY \ + +(MAX_REF_PARTS \ + *(HA_KEY_NULL_LENGTH + HA_KEY_BLOB_LENGTH))) + #define HA_LEX_CREATE_TMP_TABLE 1U #define HA_CREATE_TMP_ALTER 8U #define HA_LEX_CREATE_SEQUENCE 16U @@ -1467,7 +1488,6 @@ struct handlerton THD *victim_thd, my_bool signal); int (*set_checkpoint)(handlerton *hton, const XID* xid); int (*get_checkpoint)(handlerton *hton, XID* xid); - void (*fake_trx_id)(handlerton *hton, THD *thd); /* Optional clauses in the CREATE/ALTER TABLE */ @@ -1604,6 +1624,10 @@ struct handlerton @return transaction commit ID @retval 0 if no system-versioned data was affected by the transaction */ ulonglong (*prepare_commit_versioned)(THD *thd, ulonglong *trx_id); + + /* backup */ + void (*prepare_for_backup)(void); + void (*end_backup)(void); }; @@ -1660,6 +1684,9 @@ handlerton *ha_default_tmp_handlerton(THD *thd); // Engine needs to access the main connect string in partitions #define HTON_CAN_READ_CONNECT_STRING_IN_PARTITION (1 <<12) +/* can be replicated by wsrep replication provider plugin */ +#define HTON_WSREP_REPLICATION (1 << 13) + class Ha_trx_info; struct THD_TRANS @@ -3829,14 +3856,14 @@ public: uint max_key_parts() const { return MY_MIN(MAX_REF_PARTS, max_supported_key_parts()); } uint max_key_length() const - { return MY_MIN(MAX_KEY_LENGTH, max_supported_key_length()); } + { return MY_MIN(MAX_DATA_LENGTH_FOR_KEY, max_supported_key_length()); } uint max_key_part_length() const - { return MY_MIN(MAX_KEY_LENGTH, max_supported_key_part_length()); } + { return MY_MIN(MAX_DATA_LENGTH_FOR_KEY, max_supported_key_part_length()); } virtual uint max_supported_record_length() const { return HA_MAX_REC_LENGTH; } virtual uint max_supported_keys() const { return 0; } virtual uint max_supported_key_parts() const { return MAX_REF_PARTS; } - virtual uint max_supported_key_length() const { return MAX_KEY_LENGTH; } + virtual uint max_supported_key_length() const { return MAX_DATA_LENGTH_FOR_KEY; } virtual uint max_supported_key_part_length() const { return 255; } virtual uint min_record_length(uint options) const { return 1; } @@ -4719,6 +4746,7 @@ public: { DBUG_ASSERT(ht); return partition_ht()->flags & HTON_NATIVE_SYS_VERSIONING; } virtual void update_partition(uint part_id) {} + protected: Handler_share *get_ha_share_ptr(); void set_ha_share_ptr(Handler_share *arg_ha_share); @@ -4797,6 +4825,8 @@ int ha_create_table(THD *thd, const char *path, HA_CREATE_INFO *create_info, LEX_CUSTRING *frm); int ha_delete_table(THD *thd, handlerton *db_type, const char *path, const LEX_CSTRING *db, const LEX_CSTRING *alias, bool generate_warning); +void ha_prepare_for_backup(); +void ha_end_backup(); /* statistics and info */ bool ha_show_status(THD *thd, handlerton *db_type, enum ha_stat_type stat); @@ -4864,9 +4894,6 @@ int ha_savepoint(THD *thd, SAVEPOINT *sv); int ha_release_savepoint(THD *thd, SAVEPOINT *sv); #ifdef WITH_WSREP int ha_abort_transaction(THD *bf_thd, THD *victim_thd, my_bool signal); -void ha_fake_trx_id(THD *thd); -#else -inline void ha_fake_trx_id(THD *thd) { } #endif /* these are called by storage engines */ |