diff options
Diffstat (limited to 'sql/handler.h')
| -rw-r--r-- | sql/handler.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sql/handler.h b/sql/handler.h index f0faeff9234..62638ee456b 100644 --- a/sql/handler.h +++ b/sql/handler.h @@ -76,6 +76,7 @@ #define HA_FILE_BASED (1 << 26) #define HA_NO_VARCHAR (1 << 27) #define HA_CAN_BIT_FIELD (1 << 28) /* supports bit fields */ +#define HA_NEED_READ_RANGE_BUFFER (1 << 29) /* for read_multi_range */ /* bits in index_flags(index_number) for what you can do with index */ @@ -276,6 +277,21 @@ typedef struct st_ha_check_opt } HA_CHECK_OPT; +/* + This is a buffer area that the handler can use to store rows. + 'end_of_used_area' should be kept updated after calls to + read-functions so that other parts of the code can use the + remaining area (until next read calls is issued). +*/ + +typedef struct st_handler_buffer +{ + const byte *buffer; /* Buffer one can start using */ + const byte *buffer_end; /* End of buffer */ + byte *end_of_used_area; /* End of area that was used by handler */ +} HANDLER_BUFFER; + + class handler :public Sql_alloc { protected: @@ -310,6 +326,12 @@ public: time_t check_time; time_t update_time; + /* The following are for read_multi_range */ + bool multi_range_sorted; + KEY_MULTI_RANGE *multi_range_curr; + KEY_MULTI_RANGE *multi_range_end; + HANDLER_BUFFER *multi_range_buffer; + /* The following are for read_range() */ key_range save_end_range, *end_range; KEY_PART_INFO *range_key_part; @@ -421,6 +443,10 @@ public: virtual int index_next_same(byte *buf, const byte *key, uint keylen); virtual int index_read_last(byte * buf, const byte * key, uint key_len) { return (my_errno=HA_ERR_WRONG_COMMAND); } + virtual int read_multi_range_first(KEY_MULTI_RANGE **found_range_p, + KEY_MULTI_RANGE *ranges, uint range_count, + bool sorted, HANDLER_BUFFER *buffer); + virtual int read_multi_range_next(KEY_MULTI_RANGE **found_range_p); virtual int read_range_first(const key_range *start_key, const key_range *end_key, bool eq_range, bool sorted); |