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index_merge implementation using Unique class, to be merged into 5.0

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sergefp@mysql.com
2003-11-19 00:37:17 +03:00
parent 0466c25078
commit 1c61a92ba7
14 changed files with 1105 additions and 174 deletions
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130
sql/opt_range.h
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@ -65,48 +65,142 @@ class QUICK_RANGE :public Sql_alloc {
}
};
//class INDEX_MERGE;
class QUICK_SELECT {
/*
Quick select interface.
This class is parent for all QUICK_*_SELECT and FT_SELECT classes.
*/
class QUICK_SELECT_I
{
public:
ha_rows records; /* estimate of # of records to be retrieved */
double read_time; /* time to perform this retrieval */
TABLE *head;
/*
the only index this quick select uses, or MAX_KEY for
QUICK_INDEX_MERGE_SELECT
*/
uint index;
uint max_used_key_length, used_key_parts;
QUICK_SELECT_I();
virtual ~QUICK_SELECT_I(){};
virtual int init() = 0;
virtual int reset(void) = 0;
virtual int get_next() = 0; /* get next record to retrieve */
virtual bool reverse_sorted() = 0;
virtual bool unique_key_range() { return false; }
enum {
QS_TYPE_RANGE = 0,
QS_TYPE_INDEX_MERGE = 1,
QS_TYPE_RANGE_DESC = 2,
QS_TYPE_FULLTEXT = 3
};
/* Get type of this quick select - one of the QS_* values */
virtual int get_type() = 0;
};
struct st_qsel_param;
class SEL_ARG;
class QUICK_RANGE_SELECT : public QUICK_SELECT_I
{
protected:
bool next,dont_free;
public:
int error;
uint index, max_used_key_length, used_key_parts;
TABLE *head;
handler *file;
byte *record;
protected:
friend void print_quick_sel_range(QUICK_RANGE_SELECT *quick,
key_map needed_reg);
friend QUICK_RANGE_SELECT *get_quick_select_for_ref(TABLE *table,
struct st_table_ref *ref);
friend bool get_quick_keys(struct st_qsel_param *param,
QUICK_RANGE_SELECT *quick,KEY_PART *key,
SEL_ARG *key_tree,char *min_key,uint min_key_flag,
char *max_key, uint max_key_flag);
friend QUICK_RANGE_SELECT *get_quick_select(struct st_qsel_param*,uint idx,
SEL_ARG *key_tree,
MEM_ROOT *alloc);
friend class QUICK_SELECT_DESC;
List<QUICK_RANGE> ranges;
List_iterator<QUICK_RANGE> it;
QUICK_RANGE *range;
MEM_ROOT alloc;
KEY_PART *key_parts;
ha_rows records;
double read_time;
QUICK_SELECT(TABLE *table,uint index_arg,bool no_alloc=0);
virtual ~QUICK_SELECT();
void reset(void) { next=0; it.rewind(); }
int init() { return error=file->index_init(index); }
virtual int get_next();
virtual bool reverse_sorted() { return 0; }
int cmp_next(QUICK_RANGE *range);
public:
QUICK_RANGE_SELECT(TABLE *table,uint index_arg,bool no_alloc=0,
MEM_ROOT *parent_alloc=NULL);
~QUICK_RANGE_SELECT();
int reset(void) { next=0; it.rewind(); return 0; }
int init();
int get_next();
bool reverse_sorted() { return 0; }
bool unique_key_range();
int get_type() { return QS_TYPE_RANGE; }
};
/*
Index merge quick select.
It is implemented as a container for several QUICK_RANGE_SELECTs.
*/
class QUICK_SELECT_DESC: public QUICK_SELECT
class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I
{
public:
QUICK_SELECT_DESC(QUICK_SELECT *q, uint used_key_parts);
QUICK_INDEX_MERGE_SELECT(THD *thd, TABLE *table);
~QUICK_INDEX_MERGE_SELECT();
int init();
int reset(void);
int get_next();
bool reverse_sorted() { return false; }
bool unique_key_range() { return false; }
int get_type() { return QS_TYPE_INDEX_MERGE; }
bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
/* range quick selects this index_merge read consists of */
List<QUICK_RANGE_SELECT> quick_selects;
/* quick select which is currently used for rows retrieval */
List_iterator_fast<QUICK_RANGE_SELECT> cur_quick_it;
QUICK_RANGE_SELECT* cur_quick_select;
/* last element in quick_selects list. */
QUICK_RANGE_SELECT* last_quick_select;
Unique *unique;
MEM_ROOT alloc;
THD *thd;
int prepare_unique();
bool reset_called;
};
class QUICK_SELECT_DESC: public QUICK_RANGE_SELECT
{
public:
QUICK_SELECT_DESC(QUICK_RANGE_SELECT *q, uint used_key_parts);
int get_next();
bool reverse_sorted() { return 1; }
int get_type() { return QS_TYPE_RANGE_DESC; }
private:
int cmp_prev(QUICK_RANGE *range);
bool range_reads_after_key(QUICK_RANGE *range);
#ifdef NOT_USED
bool test_if_null_range(QUICK_RANGE *range, uint used_key_parts);
#endif
void reset(void) { next=0; rev_it.rewind(); }
int reset(void) { next=0; rev_it.rewind(); return 0; }
List<QUICK_RANGE> rev_ranges;
List_iterator<QUICK_RANGE> rev_it;
};
@ -114,7 +208,7 @@ private:
class SQL_SELECT :public Sql_alloc {
public:
QUICK_SELECT *quick; // If quick-select used
QUICK_SELECT_I *quick; // If quick-select used
COND *cond; // where condition
TABLE *head;
IO_CACHE file; // Positions to used records
@ -134,6 +228,6 @@ class SQL_SELECT :public Sql_alloc {
bool force_quick_range=0);
};
QUICK_SELECT *get_quick_select_for_ref(TABLE *table, struct st_table_ref *ref);
QUICK_RANGE_SELECT *get_quick_select_for_ref(TABLE *table, struct st_table_ref *ref);
#endif