diff options
Diffstat (limited to 'sql/sql_alter.h')
| -rw-r--r-- | sql/sql_alter.h | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/sql/sql_alter.h b/sql/sql_alter.h index 85a7b993e12..268dbc43abd 100644 --- a/sql/sql_alter.h +++ b/sql/sql_alter.h @@ -47,14 +47,24 @@ public: */ enum enum_alter_table_algorithm { - // In-place if supported, copy otherwise. +/* + Use thd->variables.alter_algorithm for alter method. If this is also + default then use the fastest possible ALTER TABLE method + (INSTANT, NOCOPY, INPLACE, COPY) +*/ ALTER_TABLE_ALGORITHM_DEFAULT, + // Copy if supported, error otherwise. + ALTER_TABLE_ALGORITHM_COPY, + // In-place if supported, error otherwise. ALTER_TABLE_ALGORITHM_INPLACE, - // Copy if supported, error otherwise. - ALTER_TABLE_ALGORITHM_COPY + // No Copy will refuse any operation which does rebuild. + ALTER_TABLE_ALGORITHM_NOCOPY, + + // Instant should allow any operation that changes metadata only. + ALTER_TABLE_ALGORITHM_INSTANT }; @@ -67,7 +77,7 @@ public: // Maximum supported level of concurency for the given operation. ALTER_TABLE_LOCK_DEFAULT, - // Allow concurrent reads & writes. If not supported, give erorr. + // Allow concurrent reads & writes. If not supported, give error. ALTER_TABLE_LOCK_NONE, // Allow concurrent reads only. If not supported, give error. @@ -174,6 +184,45 @@ public: bool set_requested_lock(const LEX_CSTRING *str); + /** + Returns the algorithm value in the format "algorithm=value" + */ + const char* algorithm() const; + + /** + Returns the lock value in the format "lock=value" + */ + const char* lock() const; + + /** + Check whether the given result can be supported + with the specified user alter algorithm. + + @param thd Thread handle + @param result Operation supported for inplace alter + @param ha_alter_info Structure describing changes to be done + by ALTER TABLE and holding data during + in-place alter + @retval false Supported operation + @retval true Not supported value + */ + bool supports_algorithm(THD *thd, enum_alter_inplace_result result, + const Alter_inplace_info *ha_alter_info); + + /** + Check whether the given result can be supported + with the specified user lock type. + + @param result Operation supported for inplace alter + @param ha_alter_info Structure describing changes to be done + by ALTER TABLE and holding data during + in-place alter + @retval false Supported lock type + @retval true Not supported value + */ + bool supports_lock(THD *thd, enum_alter_inplace_result result, + const Alter_inplace_info *ha_alter_info); + private: Alter_info &operator=(const Alter_info &rhs); // not implemented Alter_info(const Alter_info &rhs); // not implemented |