diff options
Diffstat (limited to 'sql/handler.h')
| -rw-r--r-- | sql/handler.h | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/sql/handler.h b/sql/handler.h index 31b7bdcf998..01dc9a345e7 100644 --- a/sql/handler.h +++ b/sql/handler.h @@ -49,6 +49,11 @@ class Alter_info; class Virtual_column_info; class sequence_definition; class Rowid_filter; +class Field_string; +class Field_varstring; +class Field_blob; +class Field_geom; +class Column_definition; // the following is for checking tables @@ -324,10 +329,6 @@ enum enum_alter_inplace_result { /* Safe for online backup */ #define HA_CAN_ONLINE_BACKUPS (1ULL << 56) -/** whether every data field explicitly stores length -(holds for InnoDB ROW_FORMAT=REDUNDANT) */ -#define HA_EXTENDED_TYPES_CONVERSION (1ULL << 57) - /* Support native hash index */ #define HA_CAN_HASH_KEYS (1ULL << 58) #define HA_LAST_TABLE_FLAG HA_CAN_HASH_KEYS @@ -710,13 +711,9 @@ typedef ulonglong alter_table_operations; #define ALTER_VIRTUAL_COLUMN_TYPE (1ULL << 47) #define ALTER_STORED_COLUMN_TYPE (1ULL << 48) -/** - Change column datatype in such way that new type has compatible - packed representation with old type, so it is theoretically - possible to perform change by only updating data dictionary - without changing table rows. -*/ -#define ALTER_COLUMN_EQUAL_PACK_LENGTH (1ULL << 49) + +// Engine can handle type change by itself in ALGORITHM=INPLACE +#define ALTER_COLUMN_TYPE_CHANGE_BY_ENGINE (1ULL << 49) // Reorder column #define ALTER_STORED_COLUMN_ORDER (1ULL << 50) @@ -4805,6 +4802,32 @@ public: virtual bool is_clustering_key(uint index) { return false; } + /** + Some engines can perform column type conversion with ALGORITHM=INPLACE. + These functions check for such possibility. + Implementation could be based on Field_xxx::is_equal() + */ + virtual bool can_convert_string(const Field_string *field, + const Column_definition &new_type) const + { + return false; + } + virtual bool can_convert_varstring(const Field_varstring *field, + const Column_definition &new_type) const + { + return false; + } + virtual bool can_convert_blob(const Field_blob *field, + const Column_definition &new_type) const + { + return false; + } + virtual bool can_convert_geom(const Field_geom *field, + const Column_definition &new_type) const + { + return false; + } + protected: Handler_share *get_ha_share_ptr(); void set_ha_share_ptr(Handler_share *arg_ha_share); |