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Commit 906c9a93 authored by Igor Babaev's avatar Igor Babaev
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Supported extended keys when collecting and using persistent statistics.

parent 9f53c310
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Showing with 246 additions and 14 deletions
mysql-test/r/stat_tables.result
View file @ 906c9a93
...@@ -3,6 +3,81 @@ set optimizer_use_stat_tables='preferably'; ...@@ -3,6 +3,81 @@ set optimizer_use_stat_tables='preferably';
DROP DATABASE IF EXISTS dbt3_s001; DROP DATABASE IF EXISTS dbt3_s001;
CREATE DATABASE dbt3_s001; CREATE DATABASE dbt3_s001;
use dbt3_s001; use dbt3_s001;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
select * from mysql.table_stat;
db_name table_name cardinality
dbt3_s001 customer 150
dbt3_s001 lineitem 6005
dbt3_s001 nation 25
dbt3_s001 orders 1500
dbt3_s001 part 200
dbt3_s001 partsupp 700
dbt3_s001 region 5
dbt3_s001 supplier 10
select * from mysql.index_stat;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 customer PRIMARY 1 1
dbt3_s001 customer i_c_nationkey 1 6
dbt3_s001 lineitem PRIMARY 1 4.003333333333333
dbt3_s001 lineitem PRIMARY 2 1
dbt3_s001 lineitem i_l_shipdate 1 2.650044130626655
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.025
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.57857142857143
dbt3_s001 lineitem i_l_partkey 1 30.025
dbt3_s001 lineitem i_l_suppkey 1 600.5
dbt3_s001 lineitem i_l_receiptdate 1 2.6477072310405645
dbt3_s001 lineitem i_l_orderkey 1 4.003333333333333
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.003333333333333
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0403672903672905
dbt3_s001 lineitem i_l_commitdate 1 2.7159656264133876
dbt3_s001 nation PRIMARY 1 1
dbt3_s001 nation i_n_regionkey 1 5
dbt3_s001 orders PRIMARY 1 1
dbt3_s001 orders i_o_orderdate 1 1.3321492007104796
dbt3_s001 orders i_o_custkey 1 15
dbt3_s001 part PRIMARY 1 1
dbt3_s001 part i_p_retailprice 1 1
dbt3_s001 partsupp PRIMARY 1 3.5
dbt3_s001 partsupp PRIMARY 2 1
dbt3_s001 partsupp i_ps_partkey 1 3.5
dbt3_s001 partsupp i_ps_suppkey 1 70
dbt3_s001 region PRIMARY 1 1
dbt3_s001 supplier PRIMARY 1 1
dbt3_s001 supplier i_s_nationkey 1 1.1111111111111112
set optimizer_switch=@save_optimizer_switch;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off';
EXPLAIN select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
from customer, orders, lineitem, supplier, nation, region
where c_custkey = o_custkey and l_orderkey = o_orderkey
and l_suppkey = s_suppkey and c_nationkey = s_nationkey
and s_nationkey = n_nationkey and n_regionkey = r_regionkey
and r_name = 'AMERICA' and o_orderdate >= date '1995-01-01'
and o_orderdate < date '1995-01-01' + interval '1' year
group by n_name
order by revenue desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_custkey i_o_orderdate 4 NULL 179 Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3_s001.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY,i_n_regionkey PRIMARY 4 dbt3_s001.customer.c_nationkey 1
1 SIMPLE region ALL PRIMARY NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 SIMPLE lineitem ref PRIMARY,i_l_suppkey,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 Using where
1 SIMPLE supplier eq_ref PRIMARY,i_s_nationkey PRIMARY 4 dbt3_s001.lineitem.l_suppkey 1 Using where
select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
from customer, orders, lineitem, supplier, nation, region
where c_custkey = o_custkey and l_orderkey = o_orderkey
and l_suppkey = s_suppkey and c_nationkey = s_nationkey
and s_nationkey = n_nationkey and n_regionkey = r_regionkey
and r_name = 'AMERICA' and o_orderdate >= date '1995-01-01'
and o_orderdate < date '1995-01-01' + interval '1' year
group by n_name
order by revenue desc;
n_name revenue
PERU 321915.8715
ARGENTINA 69817.1451
set optimizer_switch=@save_optimizer_switch;
delete from mysql.index_stat;
select * from mysql.table_stat; select * from mysql.table_stat;
db_name table_name cardinality db_name table_name cardinality
dbt3_s001 customer 150 dbt3_s001 customer 150
......
mysql-test/r/stat_tables_innodb.result
View file @ 906c9a93
SET SESSION STORAGE_ENGINE='InnoDB'; SET SESSION STORAGE_ENGINE='InnoDB';
set @save_optimizer_switch_for_stat_tables_test=@@optimizer_switch;
set optimizer_switch='extended_keys=on';
set @save_optimizer_use_stat_tables=@@optimizer_use_stat_tables; set @save_optimizer_use_stat_tables=@@optimizer_use_stat_tables;
set optimizer_use_stat_tables='preferably'; set optimizer_use_stat_tables='preferably';
DROP DATABASE IF EXISTS dbt3_s001; DROP DATABASE IF EXISTS dbt3_s001;
CREATE DATABASE dbt3_s001; CREATE DATABASE dbt3_s001;
use dbt3_s001; use dbt3_s001;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
select * from mysql.table_stat;
db_name table_name cardinality
dbt3_s001 customer 150
dbt3_s001 lineitem 6005
dbt3_s001 nation 25
dbt3_s001 orders 1500
dbt3_s001 part 200
dbt3_s001 partsupp 700
dbt3_s001 region 5
dbt3_s001 supplier 10
select * from mysql.index_stat;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 customer PRIMARY 1 1
dbt3_s001 customer i_c_nationkey 1 6
dbt3_s001 lineitem PRIMARY 1 4.003333333333333
dbt3_s001 lineitem PRIMARY 2 1
dbt3_s001 lineitem i_l_shipdate 1 2.650044130626655
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.025
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.57857142857143
dbt3_s001 lineitem i_l_partkey 1 30.025
dbt3_s001 lineitem i_l_suppkey 1 600.5
dbt3_s001 lineitem i_l_receiptdate 1 2.6477072310405645
dbt3_s001 lineitem i_l_orderkey 1 4.003333333333333
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.003333333333333
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0403672903672905
dbt3_s001 lineitem i_l_commitdate 1 2.7159656264133876
dbt3_s001 nation PRIMARY 1 1
dbt3_s001 nation i_n_regionkey 1 5
dbt3_s001 orders PRIMARY 1 1
dbt3_s001 orders i_o_orderdate 1 1.3321492007104796
dbt3_s001 orders i_o_custkey 1 15
dbt3_s001 part PRIMARY 1 1
dbt3_s001 part i_p_retailprice 1 1
dbt3_s001 partsupp PRIMARY 1 3.5
dbt3_s001 partsupp PRIMARY 2 1
dbt3_s001 partsupp i_ps_partkey 1 3.5
dbt3_s001 partsupp i_ps_suppkey 1 70
dbt3_s001 region PRIMARY 1 1
dbt3_s001 supplier PRIMARY 1 1
dbt3_s001 supplier i_s_nationkey 1 1.1111111111111112
set optimizer_switch=@save_optimizer_switch;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off';
EXPLAIN select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
from customer, orders, lineitem, supplier, nation, region
where c_custkey = o_custkey and l_orderkey = o_orderkey
and l_suppkey = s_suppkey and c_nationkey = s_nationkey
and s_nationkey = n_nationkey and n_regionkey = r_regionkey
and r_name = 'AMERICA' and o_orderdate >= date '1995-01-01'
and o_orderdate < date '1995-01-01' + interval '1' year
group by n_name
order by revenue desc;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_custkey i_o_orderdate 4 NULL 211 Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3_s001.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY,i_n_regionkey PRIMARY 4 dbt3_s001.customer.c_nationkey 1
1 SIMPLE supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.customer.c_nationkey 1 Using index
1 SIMPLE region ALL PRIMARY NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 SIMPLE lineitem ref PRIMARY,i_l_suppkey,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 Using where
select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
from customer, orders, lineitem, supplier, nation, region
where c_custkey = o_custkey and l_orderkey = o_orderkey
and l_suppkey = s_suppkey and c_nationkey = s_nationkey
and s_nationkey = n_nationkey and n_regionkey = r_regionkey
and r_name = 'AMERICA' and o_orderdate >= date '1995-01-01'
and o_orderdate < date '1995-01-01' + interval '1' year
group by n_name
order by revenue desc;
n_name revenue
PERU 321915.8715
ARGENTINA 69817.1451
set optimizer_switch=@save_optimizer_switch;
delete from mysql.index_stat;
select * from mysql.table_stat; select * from mysql.table_stat;
db_name table_name cardinality db_name table_name cardinality
dbt3_s001 customer 150 dbt3_s001 customer 150
...@@ -18,32 +95,54 @@ select * from mysql.index_stat; ...@@ -18,32 +95,54 @@ select * from mysql.index_stat;
db_name table_name index_name prefix_arity avg_frequency db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 customer PRIMARY 1 1 dbt3_s001 customer PRIMARY 1 1
dbt3_s001 customer i_c_nationkey 1 6 dbt3_s001 customer i_c_nationkey 1 6
dbt3_s001 customer i_c_nationkey 2 1
dbt3_s001 lineitem PRIMARY 1 4.003333333333333 dbt3_s001 lineitem PRIMARY 1 4.003333333333333
dbt3_s001 lineitem PRIMARY 2 1 dbt3_s001 lineitem PRIMARY 2 1
dbt3_s001 lineitem i_l_shipdate 1 2.650044130626655 dbt3_s001 lineitem i_l_shipdate 1 2.650044130626655
dbt3_s001 lineitem i_l_shipdate 2 1.014872401554842
dbt3_s001 lineitem i_l_shipdate 3 1
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.025 dbt3_s001 lineitem i_l_suppkey_partkey 1 30.025
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.57857142857143 dbt3_s001 lineitem i_l_suppkey_partkey 2 8.57857142857143
dbt3_s001 lineitem i_l_suppkey_partkey 3 1.0030065141139135
dbt3_s001 lineitem i_l_suppkey_partkey 4 1
dbt3_s001 lineitem i_l_partkey 1 30.025 dbt3_s001 lineitem i_l_partkey 1 30.025
dbt3_s001 lineitem i_l_partkey 2 1.008904569892473
dbt3_s001 lineitem i_l_partkey 3 1
dbt3_s001 lineitem i_l_suppkey 1 600.5 dbt3_s001 lineitem i_l_suppkey 1 600.5
dbt3_s001 lineitem i_l_suppkey 2 1.207277844792923
dbt3_s001 lineitem i_l_suppkey 3 1
dbt3_s001 lineitem i_l_receiptdate 1 2.6477072310405645 dbt3_s001 lineitem i_l_receiptdate 1 2.6477072310405645
dbt3_s001 lineitem i_l_receiptdate 2 1.0152155536770922
dbt3_s001 lineitem i_l_receiptdate 3 1
dbt3_s001 lineitem i_l_orderkey 1 4.003333333333333 dbt3_s001 lineitem i_l_orderkey 1 4.003333333333333
dbt3_s001 lineitem i_l_orderkey 2 1
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.003333333333333 dbt3_s001 lineitem i_l_orderkey_quantity 1 4.003333333333333
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0403672903672905 dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0403672903672905
dbt3_s001 lineitem i_l_orderkey_quantity 3 1
dbt3_s001 lineitem i_l_commitdate 1 2.7159656264133876 dbt3_s001 lineitem i_l_commitdate 1 2.7159656264133876
dbt3_s001 lineitem i_l_commitdate 2 1.036416983085951
dbt3_s001 lineitem i_l_commitdate 3 1
dbt3_s001 nation PRIMARY 1 1 dbt3_s001 nation PRIMARY 1 1
dbt3_s001 nation i_n_regionkey 1 5 dbt3_s001 nation i_n_regionkey 1 5
dbt3_s001 nation i_n_regionkey 2 1
dbt3_s001 orders PRIMARY 1 1 dbt3_s001 orders PRIMARY 1 1
dbt3_s001 orders i_o_orderdate 1 1.3321492007104796 dbt3_s001 orders i_o_orderdate 1 1.3321492007104796
dbt3_s001 orders i_o_orderdate 2 1
dbt3_s001 orders i_o_custkey 1 15 dbt3_s001 orders i_o_custkey 1 15
dbt3_s001 orders i_o_custkey 2 1
dbt3_s001 part PRIMARY 1 1 dbt3_s001 part PRIMARY 1 1
dbt3_s001 part i_p_retailprice 1 1 dbt3_s001 part i_p_retailprice 1 1
dbt3_s001 part i_p_retailprice 2 1
dbt3_s001 partsupp PRIMARY 1 3.5 dbt3_s001 partsupp PRIMARY 1 3.5
dbt3_s001 partsupp PRIMARY 2 1 dbt3_s001 partsupp PRIMARY 2 1
dbt3_s001 partsupp i_ps_partkey 1 3.5 dbt3_s001 partsupp i_ps_partkey 1 3.5
dbt3_s001 partsupp i_ps_partkey 2 1
dbt3_s001 partsupp i_ps_suppkey 1 70 dbt3_s001 partsupp i_ps_suppkey 1 70
dbt3_s001 partsupp i_ps_suppkey 2 1
dbt3_s001 region PRIMARY 1 1 dbt3_s001 region PRIMARY 1 1
dbt3_s001 supplier PRIMARY 1 1 dbt3_s001 supplier PRIMARY 1 1
dbt3_s001 supplier i_s_nationkey 1 1.1111111111111112 dbt3_s001 supplier i_s_nationkey 1 1.1111111111111112
dbt3_s001 supplier i_s_nationkey 2 1
set @save_optimizer_switch=@@optimizer_switch; set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off'; set optimizer_switch='index_condition_pushdown=off';
EXPLAIN select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue EXPLAIN select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue
...@@ -228,4 +327,5 @@ set optimizer_switch=@save_optimizer_switch; ...@@ -228,4 +327,5 @@ set optimizer_switch=@save_optimizer_switch;
DROP DATABASE dbt3_s001; DROP DATABASE dbt3_s001;
use test; use test;
set optimizer_use_stat_tables=@save_optimizer_use_stat_tables; set optimizer_use_stat_tables=@save_optimizer_use_stat_tables;
set optimizer_switch=@save_optimizer_switch_for_stat_tables_test;
SET SESSION STORAGE_ENGINE=DEFAULT; SET SESSION STORAGE_ENGINE=DEFAULT;
mysql-test/t/stat_tables.test
View file @ 906c9a93
...@@ -11,14 +11,20 @@ CREATE DATABASE dbt3_s001; ...@@ -11,14 +11,20 @@ CREATE DATABASE dbt3_s001;
use dbt3_s001; use dbt3_s001;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
--disable_query_log --disable_query_log
--disable_result_log --disable_result_log
--disable_warnings --disable_warnings
--source include/dbt3_s001.inc --source include/dbt3_s001.inc
create index i_p_retailprice on part(p_retailprice); create index i_p_retailprice on part(p_retailprice);
delete from mysql.table_stat;
delete from mysql.column_stat;
delete from mysql.index_stat;
ANALYZE TABLE ANALYZE TABLE
customer, lineitem, nation, orders, part, partsupp, region, supplier; customer, lineitem, nation, orders, part, partsupp, region, supplier;
FLUSH TABLES customer, lineitem, nation, orders, part, partsupp, region, supplier; FLUSH TABLE mysql.table_stat, mysql.index_stat;
--enable_warnings --enable_warnings
--enable_result_log --enable_result_log
--enable_query_log --enable_query_log
...@@ -26,6 +32,7 @@ FLUSH TABLES customer, lineitem, nation, orders, part, partsupp, region, supplie ...@@ -26,6 +32,7 @@ FLUSH TABLES customer, lineitem, nation, orders, part, partsupp, region, supplie
select * from mysql.table_stat; select * from mysql.table_stat;
select * from mysql.index_stat; select * from mysql.index_stat;
set optimizer_switch=@save_optimizer_switch;
set @save_optimizer_switch=@@optimizer_switch; set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off'; set optimizer_switch='index_condition_pushdown=off';
...@@ -46,6 +53,28 @@ eval $Q5; ...@@ -46,6 +53,28 @@ eval $Q5;
set optimizer_switch=@save_optimizer_switch; set optimizer_switch=@save_optimizer_switch;
delete from mysql.index_stat;
--disable_query_log
--disable_result_log
--disable_warnings
ANALYZE TABLE
customer, lineitem, nation, orders, part, partsupp, region, supplier;
FLUSH TABLE mysql.table_stat, mysql.index_stat;
--enable_warnings
--enable_result_log
--enable_query_log
select * from mysql.table_stat;
select * from mysql.index_stat;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off';
eval EXPLAIN $Q5;
eval $Q5;
set optimizer_switch=@save_optimizer_switch;
let $Q8= let $Q8=
select o_year, select o_year,
......
mysql-test/t/stat_tables_innodb.test
View file @ 906c9a93
...@@ -2,6 +2,11 @@ ...@@ -2,6 +2,11 @@
SET SESSION STORAGE_ENGINE='InnoDB'; SET SESSION STORAGE_ENGINE='InnoDB';
set @save_optimizer_switch_for_stat_tables_test=@@optimizer_switch;
set optimizer_switch='extended_keys=on';
--source stat_tables.test --source stat_tables.test
set optimizer_switch=@save_optimizer_switch_for_stat_tables_test;
SET SESSION STORAGE_ENGINE=DEFAULT; SET SESSION STORAGE_ENGINE=DEFAULT;
sql/sql_statistics.cc
View file @ 906c9a93
...@@ -984,7 +984,7 @@ public: ...@@ -984,7 +984,7 @@ public:
{ {
uint i; uint i;
Prefix_calc_state *state; Prefix_calc_state *state;
uint key_parts= key_info->key_parts; uint key_parts= table->actual_n_key_parts(key_info);
empty= TRUE; empty= TRUE;
prefixes= 0; prefixes= 0;
if ((calc_state= if ((calc_state=
...@@ -1309,7 +1309,7 @@ int collect_statistics_for_table(THD *thd, TABLE *table) ...@@ -1309,7 +1309,7 @@ int collect_statistics_for_table(THD *thd, TABLE *table)
bitmap_set_all(table->read_set); bitmap_set_all(table->read_set);
/* Perform a full table scan to collect statistics on 'table's columns */ /* Perform a full table scan to collect statistics on 'table's columns */
if (!(rc= file->ha_rnd_init(FALSE))) if (!(rc= file->ha_rnd_init(TRUE)))
{ {
while ((rc= file->ha_rnd_next(table->record[0])) != HA_ERR_END_OF_FILE) while ((rc= file->ha_rnd_next(table->record[0])) != HA_ERR_END_OF_FILE)
{ {
...@@ -1481,7 +1481,7 @@ int update_statistics_for_table(THD *thd, TABLE *table) ...@@ -1481,7 +1481,7 @@ int update_statistics_for_table(THD *thd, TABLE *table)
for (key_info= table->key_info, key_info_end= table->key_info+keys; for (key_info= table->key_info, key_info_end= table->key_info+keys;
key_info < key_info_end; key_info++) key_info < key_info_end; key_info++)
{ {
uint key_parts= key_info->key_parts; uint key_parts= table->actual_n_key_parts(key_info);
for (i= 0; i < key_parts; i++) for (i= 0; i < key_parts; i++)
{ {
restore_record(stat_table, s->default_values); restore_record(stat_table, s->default_values);
...@@ -1573,33 +1573,56 @@ int read_statistics_for_table(THD *thd, TABLE *table) ...@@ -1573,33 +1573,56 @@ int read_statistics_for_table(THD *thd, TABLE *table)
for (key_info= table->key_info, key_info_end= key_info+table->s->keys; for (key_info= table->key_info, key_info_end= key_info+table->s->keys;
key_info < key_info_end; key_info++) key_info < key_info_end; key_info++)
{ {
uint key_parts= table->actual_n_key_parts(key_info);
for (i= 0; i < key_info->key_parts; i++) for (i= 0; i < key_parts; i++)
{ {
index_stat.set_key_fields(key_info, i+1); index_stat.set_key_fields(key_info, i+1);
index_stat.get_stat_values(); index_stat.get_stat_values();
} }
key_part_map ext_key_part_map= key_info->ext_key_part_map; key_part_map ext_key_part_map= key_info->ext_key_part_map;
if (key_info->key_parts != key_info->ext_key_parts) if (key_info->key_parts != key_info->ext_key_parts &&
key_info->read_stat.avg_frequency[key_info->key_parts] == 0)
{ {
double *ptr;
double *ptr_end;
KEY *pk_key_info= table->key_info + table->s->primary_key; KEY *pk_key_info= table->key_info + table->s->primary_key;
uint k= key_info->key_parts; uint k= key_info->key_parts;
double k_avg_frequency= key_info->read_stat.avg_frequency[k-1];
uint pk_parts= pk_key_info->key_parts; uint pk_parts= pk_key_info->key_parts;
ha_rows n_rows= table->read_stat.cardinality; ha_rows n_rows= table->read_stat.cardinality;
double k_dist= n_rows / key_info->read_stat.avg_frequency[k-1];
double *k_avg_freq_ptr= key_info->read_stat.avg_frequency + k;
uint m= 0;
for (uint j= 0; j < pk_parts; j++) for (uint j= 0; j < pk_parts; j++)
{ {
double avg_frequency;
if (!(ext_key_part_map & 1 << j)) if (!(ext_key_part_map & 1 << j))
continue; {
avg_frequency= pk_key_info->read_stat.avg_frequency[j]; for (ptr= k_avg_freq_ptr, ptr_end= ptr + m; ptr < ptr_end; ptr++)
{
double avg_frequency= pk_key_info->read_stat.avg_frequency[j-1];
set_if_smaller(avg_frequency, 1);
(*ptr)*= pk_key_info->read_stat.avg_frequency[j]/avg_frequency;
}
}
else
{
key_info->read_stat.avg_frequency[k + m]=
pk_key_info->read_stat.avg_frequency[j];
m++;
}
}
for (ptr= k_avg_freq_ptr, ptr_end= ptr + m; ptr < ptr_end; ptr++)
{
double avg_frequency= *ptr;
if (avg_frequency == 0 || if (avg_frequency == 0 ||
table->read_stat.cardinality_is_null) table->read_stat.cardinality_is_null)
avg_frequency= 1; avg_frequency= 1;
else if (avg_frequency > 1) else if (avg_frequency > 1)
avg_frequency= max(k_avg_frequency * avg_frequency / n_rows, 1); {
key_info->read_stat.avg_frequency[k++]= avg_frequency; avg_frequency/= k_dist;
set_if_bigger(avg_frequency, 1);
}
*ptr= avg_frequency;
} }
} }
} }
......
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