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Code Activity

Added thread variable max_seeks_for_key

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Change optimizer to prefer key lookups before table scan
Change table scans to be done after tables with constrains on scanned table 


mysql-test/r/distinct.result:
  Update results
mysql-test/r/group_by.result:
  Update results
mysql-test/r/heap.result:
  Update results
mysql-test/r/join.result:
  Update results
mysql-test/r/key_diff.result:
  Update results
mysql-test/r/myisam.result:
  Update results
mysql-test/r/order_by.result:
  Update results
mysql-test/r/select_safe.result:
  Update results
mysql-test/t/distinct.test:
  Change test to be repeatable
mysql-test/t/join.test:
  Change test to be repeatable
mysql-test/t/select_safe.test:
  Add tests for MAX_SEEKS_FOR_KEY
sql/handler.h:
  Optimize structure for 64 bit machines (and to avoid problems with gdb)
sql/item_cmpfunc.cc:
  Initialize not_null_tables_cache properly
sql/mysqld.cc:
  Added max_seeks_for_key
sql/set_var.cc:
  Added max_seeks_for_key
sql/sql_class.h:
  Added max_seeks_for_key
sql/sql_select.cc:
  Added max_seeks_for_key
  Change optimizer to prefer key lookups before table scan.
  Change table scans to be done after tables with constrains on scanned table
This commit is contained in:
unknown
2003-06-27 03:04:54 +03:00
parent 7539980eb1
commit c2cb9b97be
17 changed files with 114 additions and 65 deletions
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37
sql/handler.h
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@ -184,40 +184,41 @@ class handler :public Sql_alloc
{
protected:
struct st_table *table; /* The table definition */
uint active_index;
public:
byte *ref; /* Pointer to current row */
byte *dupp_ref; /* Pointer to dupp row */
uint ref_length; /* Length of ref (1-8 or the clustered
key length) */
uint block_size; /* index block size */
ha_rows records; /* Records i datafilen */
ha_rows deleted; /* Deleted records */
ulonglong data_file_length; /* Length off data file */
ulonglong max_data_file_length; /* Length off data file */
ulonglong index_file_length;
ulonglong max_index_file_length;
ulonglong delete_length; /* Free bytes */
ulonglong auto_increment_value;
uint raid_type,raid_chunks;
ha_rows records; /* Records in table */
ha_rows deleted; /* Deleted records */
ulong raid_chunksize;
uint errkey; /* Last dup key */
uint sortkey, key_used_on_scan;
ulong mean_rec_length; /* physical reclength */
time_t create_time; /* When table was created */
time_t check_time;
time_t update_time;
ulong mean_rec_length; /* physical reclength */
uint errkey; /* Last dup key */
uint sortkey, key_used_on_scan;
uint active_index;
/* Length of ref (1-8 or the clustered key length) */
uint ref_length;
uint block_size; /* index block size */
uint raid_type,raid_chunks;
FT_INFO *ft_handler;
bool auto_increment_column_changed;
handler(TABLE *table_arg) : table(table_arg),active_index(MAX_REF_PARTS),
ref(0),ref_length(sizeof(my_off_t)), block_size(0),records(0),deleted(0),
data_file_length(0), max_data_file_length(0), index_file_length(0),
delete_length(0), auto_increment_value(0), raid_type(0),
key_used_on_scan(MAX_KEY),
create_time(0), check_time(0), update_time(0), mean_rec_length(0),
ft_handler(0)
handler(TABLE *table_arg) :table(table_arg),
ref(0), data_file_length(0), max_data_file_length(0), index_file_length(0),
delete_length(0), auto_increment_value(0),
records(0), deleted(0), mean_rec_length(0),
create_time(0), check_time(0), update_time(0),
key_used_on_scan(MAX_KEY), active_index(MAX_REF_PARTS),
ref_length(sizeof(my_off_t)), block_size(0),
raid_type(0), ft_handler(0)
{}
virtual ~handler(void) {}
int ha_open(const char *name, int mode, int test_if_locked);
@ -227,7 +228,7 @@ public:
uint get_dup_key(int error);
void change_table_ptr(TABLE *table_arg) { table=table_arg; }
virtual double scan_time()
{ return ulonglong2double(data_file_length) / IO_SIZE + 1; }
{ return ulonglong2double(data_file_length) / IO_SIZE + 2; }
virtual double read_time(uint index, uint ranges, ha_rows rows)
{ return rows2double(ranges+rows); }
virtual bool fast_key_read() { return 0;}