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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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47
sql/opt_range.h
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@ -24,16 +24,6 @@
#pragma interface /* gcc class implementation */
#endif
#define NO_MIN_RANGE 1
#define NO_MAX_RANGE 2
#define NEAR_MIN 4
#define NEAR_MAX 8
#define UNIQUE_RANGE 16
#define EQ_RANGE 32
#define NULL_RANGE 64
#define GEOM_FLAG 128
typedef struct st_key_part {
uint16 key,part, store_length, length;
uint8 null_bit;
@ -135,9 +125,24 @@ public:
*/
virtual int reset(void) = 0;
/*
Initialize get_next() for row retrieval.
SYNOPSIS
get_next_init()
get_next_init() must be called before the first get_next().
If get_next_init() call fails get_next() must not be called.
RETURN
0 OK
other Error code
*/
virtual int get_next_init() { return false; }
virtual int get_next() = 0; /* get next record to retrieve */
/* Range end should be called when we have looped over the whole index */
virtual void range_end() {}
virtual int get_next() = 0; /* get next record to retrieve */
virtual bool reverse_sorted() = 0;
virtual bool unique_key_range() { return false; }
@ -236,6 +241,14 @@ protected:
closed no later then this quick select is deleted.
*/
bool free_file;
bool in_range;
uint multi_range_count; /* copy from thd->variables.multi_range_count */
uint multi_range_length; /* the allocated length for the array */
uint multi_range_bufsiz; /* copy from thd->variables.read_rnd_buff_size */
KEY_MULTI_RANGE *multi_range; /* the multi-range array (allocated and
freed by QUICK_RANGE_SELECT) */
HANDLER_BUFFER *multi_range_buff; /* the handler buffer (allocated and
freed by QUICK_RANGE_SELECT) */
protected:
friend class TRP_ROR_INTERSECT;
@ -270,18 +283,19 @@ public:
MEM_ROOT *parent_alloc=NULL);
~QUICK_RANGE_SELECT();
int init();
int reset(void)
{
next=0;
range= NULL;
cur_range= NULL;
cur_range= (QUICK_RANGE**) ranges.buffer;
/*
Note: in opt_range.cc there are places where it is assumed that this
function always succeeds
*/
return 0;
}
int init();
int get_next_init(void);
int get_next();
void range_end();
int get_next_prefix(uint prefix_length, byte *cur_prefix);
@ -296,6 +310,13 @@ public:
#ifndef DBUG_OFF
void dbug_dump(int indent, bool verbose);
#endif
QUICK_RANGE_SELECT(const QUICK_RANGE_SELECT& org) : QUICK_SELECT_I()
{
bcopy(&org, this, sizeof(*this));
multi_range_length= 0;
multi_range= NULL;
multi_range_buff= NULL;
}
};