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WL#2126 - Multi_read_range.

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Added the required structures and functions for
handing over multiple key ranges to the table handler.
This commit is contained in:
ingo@mysql.com
2004-12-23 21:45:10 +01:00
parent bf40ab8cb1
commit 60e35755ef
9 changed files with 406 additions and 68 deletions
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26
sql/handler.h
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@ -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);