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Added histogams for table columns.

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This commit is contained in:
Igor Babaev 2013-03-25 23:48:29 -07:00
parent fc1c8ffdad
commit 1009832c13
23 changed files with 1328 additions and 339 deletions
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18
mysql-test/r/mysqld--help.result
View File

@ -202,6 +202,8 @@ The following options may be given as the first argument:
The maximum length of the result of function
GROUP_CONCAT()
-?, --help Display this help and exit.
--histogram-size=# Number of bytes used for a histogram. If set to 0, no
histograms are created by ANALYZE.
--ignore-builtin-innodb
Disable initialization of builtin InnoDB plugin
--ignore-db-dirs=name
@ -505,13 +507,16 @@ The following options may be given as the first argument:
takes into account to calculate cardinality of a partial
join when it searches for the best execution plan
Meaning: 1 - use selectivity of index backed range
conditions to calculate cardinality of the partial join
conditions to calculate the cardinality of a partial join
if the last joined table is accessed by full table scan
or an index scan 2 - use selectivity of index backed
range conditions to calculate cardinality of the partial
join in any case 3 - additionally always use selectivity
of range conditions that are not backed by any index to
calculate cardinality of the partial join
or an index scan, 2 - use selectivity of index backed
range conditions to calculate the cardinality of a
partial join in any case, 3 - additionally always use
selectivity of range conditions that are not backed by
any index to calculate the cardinality of a partial join,
4 - use histograms to calculate selectivity of range
conditions that are not backed by any index to calculate
the cardinality of a partial join.
--performance-schema
Enable the performance schema.
--performance-schema-events-waits-history-long-size=#
@ -926,6 +931,7 @@ gdb FALSE
general-log FALSE
group-concat-max-len 1024
help TRUE
histogram-size 0
ignore-builtin-innodb FALSE
ignore-db-dirs
init-connect

111
mysql-test/r/selectivity.result
View File

@ -10,6 +10,7 @@ DROP DATABASE IF EXISTS dbt3_s001;
CREATE DATABASE dbt3_s001;
use dbt3_s001;
set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
set @save_histogram_size=@@histogram_size;
EXPLAIN EXTENDED select sql_calc_found_rows
s_name, s_address
from supplier, nation
@ -84,7 +85,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 4.17 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 15.14 Using where
Warnings:
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2
@ -109,6 +110,114 @@ order by s_name
limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
set histogram_size=15;
flush table part;
ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES();
Table Op Msg_type Msg_text
dbt3_s001.part analyze status Table is already up to date
set optimizer_use_condition_selectivity=4;
EXPLAIN EXTENDED select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
1 PRIMARY partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey i_ps_partkey 4 dbt3_s001.part.p_partkey 3 100.00 Using where; FirstMatch(supplier)
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 15.14 Using where
Warnings:
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2
Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`partsupp`.`ps_suppkey` = `dbt3_s001`.`supplier`.`s_suppkey`) and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <expr_cache><`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= <cache>(cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < <cache>((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10
select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
set histogram_size=24;
flush table nation;
ANALYZE TABLE nation PERSISTENT FOR COLUMNS(n_name) INDEXES();
Table Op Msg_type Msg_text
dbt3_s001.nation analyze status Table is already up to date
EXPLAIN EXTENDED select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
1 PRIMARY partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey i_ps_partkey 4 dbt3_s001.part.p_partkey 3 100.00 Using where; FirstMatch(supplier)
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 15.14 Using where
Warnings:
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2
Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`partsupp`.`ps_suppkey` = `dbt3_s001`.`supplier`.`s_suppkey`) and (`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <expr_cache><`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= <cache>(cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < <cache>((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10
select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
DROP DATABASE dbt3_s001;
set histogram_size=@save_histogram_size;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
set use_stat_tables=@save_use_stat_tables;

113
mysql-test/r/selectivity_innodb.result
View File

@ -13,6 +13,7 @@ DROP DATABASE IF EXISTS dbt3_s001;
CREATE DATABASE dbt3_s001;
use dbt3_s001;
set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
set @save_histogram_size=@@histogram_size;
EXPLAIN EXTENDED select sql_calc_found_rows
s_name, s_address
from supplier, nation
@ -87,7 +88,116 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 4.17 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where
Warnings:
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2
Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <expr_cache><`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= <cache>(cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < <cache>((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10
select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
set histogram_size=15;
flush table part;
ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES();
Table Op Msg_type Msg_text
dbt3_s001.part analyze status OK
set optimizer_use_condition_selectivity=4;
EXPLAIN EXTENDED select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where
Warnings:
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2
Note 1003 select sql_calc_found_rows `dbt3_s001`.`supplier`.`s_name` AS `s_name`,`dbt3_s001`.`supplier`.`s_address` AS `s_address` from `dbt3_s001`.`supplier` semi join (`dbt3_s001`.`part` join `dbt3_s001`.`partsupp`) join `dbt3_s001`.`nation` where ((`dbt3_s001`.`partsupp`.`ps_partkey` = `dbt3_s001`.`part`.`p_partkey`) and (`dbt3_s001`.`nation`.`n_name` = 'UNITED STATES') and (`dbt3_s001`.`supplier`.`s_nationkey` = `dbt3_s001`.`nation`.`n_nationkey`) and (`dbt3_s001`.`partsupp`.`ps_availqty` > <expr_cache><`dbt3_s001`.`partsupp`.`ps_partkey`,`dbt3_s001`.`partsupp`.`ps_suppkey`>((select (0.5 * sum(`dbt3_s001`.`lineitem`.`l_quantity`)) from `dbt3_s001`.`lineitem` where ((`dbt3_s001`.`lineitem`.`l_partkey` = `dbt3_s001`.`partsupp`.`ps_partkey`) and (`dbt3_s001`.`lineitem`.`l_suppkey` = `dbt3_s001`.`partsupp`.`ps_suppkey`) and (`dbt3_s001`.`lineitem`.`l_shipDATE` >= <cache>(cast('1993-01-01' as date))) and (`dbt3_s001`.`lineitem`.`l_shipDATE` < <cache>((cast('1993-01-01' as date) + interval '1' year))))))) and (`dbt3_s001`.`part`.`p_name` like 'g%')) order by `dbt3_s001`.`supplier`.`s_name` limit 10
select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
set histogram_size=24;
flush table nation;
ANALYZE TABLE nation PERSISTENT FOR COLUMNS(n_name) INDEXES();
Table Op Msg_type Msg_text
dbt3_s001.nation analyze status OK
EXPLAIN EXTENDED select sql_calc_found_rows
s_name, s_address
from supplier, nation
where s_suppkey in (select ps_suppkey from partsupp
where ps_partkey in (select p_partkey from part
where p_name like 'g%')
and ps_availqty >
(select 0.5 * sum(l_quantity)
from lineitem
where l_partkey = ps_partkey
and l_suppkey = ps_suppkey
and l_shipdate >= date('1993-01-01')
and l_shipdate < date('1993-01-01') +
interval '1' year ))
and s_nationkey = n_nationkey
and n_name = 'UNITED STATES'
order by s_name
limit 10;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY nation ALL PRIMARY NULL NULL NULL 25 4.00 Using where; Using temporary; Using filesort
1 PRIMARY supplier ref PRIMARY,i_s_nationkey i_s_nationkey 5 dbt3_s001.nation.n_nationkey 1 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED part ALL PRIMARY NULL NULL NULL 200 6.25 Using where
2 MATERIALIZED partsupp ref PRIMARY,i_ps_partkey,i_ps_suppkey PRIMARY 4 dbt3_s001.part.p_partkey 3 100.00 Using where
4 DEPENDENT SUBQUERY lineitem ref i_l_shipdate,i_l_suppkey_partkey,i_l_partkey,i_l_suppkey i_l_suppkey_partkey 10 dbt3_s001.partsupp.ps_partkey,dbt3_s001.partsupp.ps_suppkey 8 14.37 Using where
Warnings:
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_partkey' of SELECT #4 was resolved in SELECT #2
Note 1276 Field or reference 'dbt3_s001.partsupp.ps_suppkey' of SELECT #4 was resolved in SELECT #2
@ -113,6 +223,7 @@ limit 10;
s_name s_address
Supplier#000000010 Saygah3gYWMp72i PY
DROP DATABASE dbt3_s001;
set histogram_size=@save_histogram_size;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
set use_stat_tables=@save_use_stat_tables;
set optimizer_switch=@save_optimizer_switch_for_selectivity_test;

468
mysql-test/r/statistics.result
View File

@ -64,13 +64,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -87,8 +87,8 @@ COUNT(*)
40
SELECT * FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='a';
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
SELECT MIN(t1.a), MAX(t1.a),
(SELECT COUNT(*) FROM t1 WHERE t1.b IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.a)",
@ -99,8 +99,8 @@ MIN(t1.a) MAX(t1.a) NULLS_RATIO(t1.a) AVG_FREQUENCY(t1.a)
0 49 0.2000 1.0000
SELECT * FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='b';
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
SELECT MIN(t1.b), MAX(t1.b),
(SELECT COUNT(*) FROM t1 WHERE t1.b IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.b)",
@ -111,8 +111,8 @@ MIN(t1.b) MAX(t1.b) NULLS_RATIO(t1.b) AVG_FREQUENCY(t1.b)
vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 6.4000
SELECT * FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='c';
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
SELECT MIN(t1.c), MAX(t1.c),
(SELECT COUNT(*) FROM t1 WHERE t1.c IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.c)",
@ -123,8 +123,8 @@ MIN(t1.c) MAX(t1.c) NULLS_RATIO(t1.c) AVG_FREQUENCY(t1.c)
aaaa dddddddd 0.1250 7.0000
SELECT * FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='d';
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
SELECT MIN(t1.d), MAX(t1.d),
(SELECT COUNT(*) FROM t1 WHERE t1.d IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.d)",
@ -135,8 +135,8 @@ MIN(t1.d) MAX(t1.d) NULLS_RATIO(t1.d) AVG_FREQUENCY(t1.d)
1989-03-12 1999-07-23 0.1500 8.5000
SELECT * FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='e';
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
SELECT MIN(t1.e), MAX(t1.e),
(SELECT COUNT(*) FROM t1 WHERE t1.e IS NULL) /
(SELECT COUNT(*) FROM t1) AS "NULLS_RATIO(t1.e)",
@ -206,6 +206,28 @@ WHERE t1.e IS NOT NULL AND t1.b IS NOT NULL AND t1.d IS NOT NULL)
AS 'ARITY 3';
ARITY 1 ARITY 2 ARITY 3
6.2000 1.6875 1.1304
DELETE FROM mysql.column_stats;
set histogram_size=4;
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Table is already up to date
SELECT db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
hist_size, HEX(histogram)
FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size HEX(histogram)
test t1 a 0 49 0.0000 1.0000 4 2E62A1D0
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 6.4000 4 003FBFFF
test t1 c aaaa dddddddd 0.1250 7.0000 4 0055AAFF
test t1 d 1989-03-12 1999-07-23 0.1500 8.5000 4 009393FF
test t1 e 0.01 0.112 0.2250 6.2000 4 000564E1
test t1 f 1 5 0.2000 6.4000 4 3F7FBFBF
DELETE FROM mysql.column_stats;
set histogram_size= 0;
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Table is already up to date
CREATE TABLE t3 (
a int NOT NULL PRIMARY KEY,
b varchar(32),
@ -238,16 +260,16 @@ db_name table_name cardinality
test t1 40
test t3 17
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
test t3 a 0 38 0.0000 4.0000 1.0000
test t3 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.1765 18.0714 2.8000
test t3 c aaaa dddddddd 0.1176 6.4000 3.7500
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t3 a 0 38 0.0000 4.0000 1.0000 0 NULL
test t3 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.1765 18.0714 2.8000 0 NULL
test t3 c aaaa dddddddd 0.1176 6.4000 3.7500 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -267,16 +289,16 @@ db_name table_name cardinality
test s1 40
test t3 17
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test s1 a 0 49 0.0000 4.0000 1.0000
test s1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test s1 c aaaa dddddddd 0.1250 6.6571 7.0000
test s1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test s1 e 0.01 0.112 0.2250 8.0000 6.2000
test s1 f 1 5 0.2000 1.0000 6.4000
test t3 a 0 38 0.0000 4.0000 1.0000
test t3 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.1765 18.0714 2.8000
test t3 c aaaa dddddddd 0.1176 6.4000 3.7500
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test s1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test s1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test s1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test s1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test s1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test s1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t3 a 0 38 0.0000 4.0000 1.0000 0 NULL
test t3 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.1765 18.0714 2.8000 0 NULL
test t3 c aaaa dddddddd 0.1176 6.4000 3.7500 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test s1 PRIMARY 1 1.0000
@ -296,16 +318,16 @@ db_name table_name cardinality
test t1 40
test t3 17
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
test t3 a 0 38 0.0000 4.0000 1.0000
test t3 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.1765 18.0714 2.8000
test t3 c aaaa dddddddd 0.1176 6.4000 3.7500
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t3 a 0 38 0.0000 4.0000 1.0000 0 NULL
test t3 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.1765 18.0714 2.8000 0 NULL
test t3 c aaaa dddddddd 0.1176 6.4000 3.7500 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -324,13 +346,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -365,13 +387,13 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`y`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 x vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 y 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 x vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 y 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
ALTER TABLE t1 CHANGE COLUMN x b varchar(32),
CHANGE COLUMN y e double;
SHOW CREATE TABLE t1;
@ -390,13 +412,13 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
ALTER TABLE t1 RENAME TO s1, CHANGE COLUMN b x varchar(32);
SHOW CREATE TABLE s1;
Table Create Table
@ -417,13 +439,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test s1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test s1 a 0 49 0.0000 4.0000 1.0000
test s1 x vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test s1 c aaaa dddddddd 0.1250 6.6571 7.0000
test s1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test s1 e 0.01 0.112 0.2250 8.0000 6.2000
test s1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test s1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test s1 x vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test s1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test s1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test s1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test s1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test s1 PRIMARY 1 1.0000
@ -455,13 +477,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -490,12 +512,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -519,12 +541,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -535,13 +557,13 @@ ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx4);
Table Op Msg_type Msg_text
test.t1 analyze status OK
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -576,12 +598,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`x`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -605,12 +627,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -624,13 +646,13 @@ LOAD DATA INFILE 'MYSQLTEST_VARDIR/tmp/save_index_stats'
INTO TABLE mysql.index_stats
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\n';
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -658,12 +680,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -721,12 +743,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -735,13 +757,13 @@ ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx2, idx4);
Table Op Msg_type Msg_text
test.t1 analyze status OK
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b NULL NULL 1.0000 NULL NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b NULL NULL 1.0000 NULL NULL 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -758,13 +780,13 @@ ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx2, idx4);
Table Op Msg_type Msg_text
test.t1 analyze status OK
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -790,12 +812,12 @@ t1 CREATE TABLE `t1` (
KEY `idx3` (`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -820,12 +842,12 @@ t1 CREATE TABLE `t1` (
KEY `idx4` (`e`,`b`,`d`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -834,13 +856,13 @@ ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(b) INDEXES(idx1, idx2, idx4);
Table Op Msg_type Msg_text
test.t1 analyze status OK
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -862,7 +884,7 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
ANALYZE TABLE t1 PERSISTENT FOR COLUMNS(c,e,b) INDEXES(idx2,idx4);
@ -872,10 +894,10 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 idx2 1 7.0000
@ -912,13 +934,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -942,19 +964,19 @@ db_name table_name cardinality
test t1 40
test t2 40
SELECT * FROM mysql.column_stats ORDER BY column_name;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t2 a 0 49 0.0000 4.0000 1.0000
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t2 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t2 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
test t2 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t2 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t2 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t2 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t2 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats ORDER BY index_name, prefix_arity, table_name;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000
@ -986,13 +1008,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t2 40
SELECT * FROM mysql.column_stats ORDER BY column_name;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t2 a 0 49 0.0000 4.0000 1.0000
test t2 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t2 e 0.01 0.112 0.2250 8.0000 6.2000
test t2 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t2 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t2 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 17.1250 6.4000 0 NULL
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t2 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t2 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats ORDER BY index_name, prefix_arity, table_name;
db_name table_name index_name prefix_arity avg_frequency
test t2 PRIMARY 1 1.0000
@ -1122,12 +1144,12 @@ MODIFY COLUMN b text,
ADD INDEX idx1 (b(4), e),
ADD INDEX idx4 (e, b(4), d);
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t2 a 0 49 0.0000 4.0000 1.0000
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t2 e 0.01 0.112 0.2250 8.0000 6.2000
test t2 f 1 5 0.2000 1.0000 6.4000
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t2 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t2 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t2 f 1 5 0.2000 1.0000 6.4000 0 NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t2 idx3 1 8.5000
@ -1143,18 +1165,18 @@ ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t2 a 0 49 0.0000 4.0000 1.0000
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t2 e 0.01 0.112 0.2250 8.0000 6.2000
test t2 f 1 5 0.2000 1.0000 6.4000
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
test t1 b NULL NULL 0.2000 17.1250 NULL
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t2 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t2 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t2 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t2 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t2 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t1 b NULL NULL 0.2000 17.1250 NULL NULL NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t2 idx3 1 8.5000
@ -1187,7 +1209,7 @@ mysql.column_stats analyze status OK
SELECT * FROM mysql.table_stats;
db_name table_name cardinality
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
set use_stat_tables='never';
@ -1198,13 +1220,13 @@ SELECT * FROM mysql.table_stats;
db_name table_name cardinality
test t1 40
SELECT * FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency
test t1 a 0 49 0.0000 4.0000 1.0000
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000
test t1 e 0.01 0.112 0.2250 8.0000 6.2000
test t1 f 1 5 0.2000 1.0000 6.4000
test t1 b NULL NULL 0.2000 17.1250 NULL
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size histogram
test t1 a 0 49 0.0000 4.0000 1.0000 0 NULL
test t1 c aaaa dddddddd 0.1250 6.6571 7.0000 0 NULL
test t1 d 1989-03-12 1999-07-23 0.1500 3.0000 8.5000 0 NULL
test t1 e 0.01 0.112 0.2250 8.0000 6.2000 0 NULL
test t1 f 1 5 0.2000 1.0000 6.4000 0 NULL
test t1 b NULL NULL 0.2000 17.1250 NULL NULL NULL
SELECT * FROM mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
test t1 PRIMARY 1 1.0000

2
mysql-test/r/system_mysql_db.result
View File

@ -286,6 +286,8 @@ column_stats CREATE TABLE `column_stats` (
`nulls_ratio` decimal(12,4) DEFAULT NULL,
`avg_length` decimal(12,4) DEFAULT NULL,
`avg_frequency` decimal(12,4) DEFAULT NULL,
`hist_size` tinyint(3) unsigned DEFAULT NULL,
`histogram` varbinary(255) DEFAULT NULL,
PRIMARY KEY (`db_name`,`table_name`,`column_name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Statistics on Columns'
show create table index_stats;

5
mysql-test/suite/funcs_1/r/is_columns_mysql.result
View File

@ -13,6 +13,8 @@ def mysql column_stats avg_frequency 8 NULL YES decimal NULL NULL 12 4 NULL NULL
def mysql column_stats avg_length 7 NULL YES decimal NULL NULL 12 4 NULL NULL NULL decimal(12,4) select,insert,update,references
def mysql column_stats column_name 3 NULL NO varchar 64 192 NULL NULL NULL utf8 utf8_bin varchar(64) PRI select,insert,update,references
def mysql column_stats db_name 1 NULL NO varchar 64 192 NULL NULL NULL utf8 utf8_bin varchar(64) PRI select,insert,update,references
def mysql column_stats histogram 10 NULL YES varbinary 255 255 NULL NULL NULL NULL NULL varbinary(255) select,insert,update,references
def mysql column_stats hist_size 9 NULL YES tinyint NULL NULL 3 0 NULL NULL NULL tinyint(3) unsigned select,insert,update,references
def mysql column_stats max_value 5 NULL YES varchar 255 765 NULL NULL NULL utf8 utf8_bin varchar(255) select,insert,update,references
def mysql column_stats min_value 4 NULL YES varchar 255 765 NULL NULL NULL utf8 utf8_bin varchar(255) select,insert,update,references
def mysql column_stats nulls_ratio 6 NULL YES decimal NULL NULL 12 4 NULL NULL NULL decimal(12,4) select,insert,update,references
@ -256,6 +258,7 @@ ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
1.0000 blob NULL NULL
1.0000 longblob NULL NULL
1.0000 varbinary NULL NULL
1.0000 char latin1 latin1_bin
1.0000 char latin1 latin1_swedish_ci
1.0000 varchar latin1 latin1_swedish_ci
@ -328,6 +331,8 @@ NULL mysql columns_priv Timestamp timestamp NULL NULL NULL NULL timestamp
NULL mysql column_stats nulls_ratio decimal NULL NULL NULL NULL decimal(12,4)
NULL mysql column_stats avg_length decimal NULL NULL NULL NULL decimal(12,4)
NULL mysql column_stats avg_frequency decimal NULL NULL NULL NULL decimal(12,4)
NULL mysql column_stats hist_size tinyint NULL NULL NULL NULL tinyint(3) unsigned
1.0000 mysql column_stats histogram varbinary 255 255 NULL NULL varbinary(255)
3.0000 mysql db Host char 60 180 utf8 utf8_bin char(60)
3.0000 mysql db Db char 64 192 utf8 utf8_bin char(64)
3.0000 mysql db User char 16 48 utf8 utf8_bin char(16)

136
mysql-test/suite/sys_vars/r/histogram_size_basic.result Normal file
View File

@ -0,0 +1,136 @@
SET @start_global_value = @@global.histogram_size;
SELECT @start_global_value;
@start_global_value
0
SET @start_session_value = @@session.histogram_size;
SELECT @start_session_value;
@start_session_value
0
'#--------------------FN_DYNVARS_053_01-------------------------#'
SET @@global.histogram_size = DEFAULT;
SELECT @@global.histogram_size;
@@global.histogram_size
0
SET @@session.histogram_size = DEFAULT;
SELECT @@session.histogram_size;
@@session.histogram_size
0
'#--------------------FN_DYNVARS_053_03-------------------------#'
SET @@global.histogram_size = 1;
SELECT @@global.histogram_size;
@@global.histogram_size
1
SET @@global.histogram_size = 31;
SELECT @@global.histogram_size;
@@global.histogram_size
31
SET @@global.histogram_size = 255;
SELECT @@global.histogram_size;
@@global.histogram_size
255
'#--------------------FN_DYNVARS_053_04-------------------------#'
SET @@session.histogram_size = 1;
SELECT @@session.histogram_size;
@@session.histogram_size
1
SET @@session.histogram_size = 31;
SELECT @@session.histogram_size;
@@session.histogram_size
31
SET @@session.histogram_size = 255;
SELECT @@session.histogram_size;
@@session.histogram_size
255
'#------------------FN_DYNVARS_053_05-----------------------#'
SET @@global.histogram_size = -1;
Warnings:
Warning 1292 Truncated incorrect histogram_size value: '-1'
SELECT @@global.histogram_size;
@@global.histogram_size
0
SET @@global.histogram_size = 256;
Warnings:
Warning 1292 Truncated incorrect histogram_size value: '256'
SELECT @@global.histogram_size;
@@global.histogram_size
255
SET @@global.histogram_size = 1024;
Warnings:
Warning 1292 Truncated incorrect histogram_size value: '1024'
SELECT @@global.histogram_size;
@@global.histogram_size
255
SET @@global.histogram_size = 4.5;
ERROR 42000: Incorrect argument type to variable 'histogram_size'
SELECT @@global.histogram_size;
@@global.histogram_size
255
SET @@global.histogram_size = test;
ERROR 42000: Incorrect argument type to variable 'histogram_size'
SELECT @@global.histogram_size;
@@global.histogram_size
255
SET @@session.histogram_size = -1;
Warnings:
Warning 1292 Truncated incorrect histogram_size value: '-1'
SELECT @@session.histogram_size;
@@session.histogram_size
0
SET @@session.histogram_size = 256;
Warnings:
Warning 1292 Truncated incorrect histogram_size value: '256'
SELECT @@session.histogram_size;
@@session.histogram_size
255
SET @@session.histogram_size = 1024;
Warnings:
Warning 1292 Truncated incorrect histogram_size value: '1024'
SELECT @@session.histogram_size;
@@session.histogram_size
255
SET @@session.histogram_size = 4.5;
ERROR 42000: Incorrect argument type to variable 'histogram_size'
SELECT @@session.histogram_size;
@@session.histogram_size
255
SET @@session.histogram_size = test;
ERROR 42000: Incorrect argument type to variable 'histogram_size'
SELECT @@session.histogram_size;
@@session.histogram_size
255
'#------------------FN_DYNVARS_053_06-----------------------#'
SELECT @@global.histogram_size = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='histogram_size';
@@global.histogram_size = VARIABLE_VALUE
1
'#------------------FN_DYNVARS_053_07-----------------------#'
SELECT @@session.histogram_size = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.SESSION_VARIABLES
WHERE VARIABLE_NAME='histogram_size';
@@session.histogram_size = VARIABLE_VALUE
1
'#------------------FN_DYNVARS_053_08-----------------------#'
SET @@global.histogram_size = TRUE;
SET @@global.histogram_size = FALSE;
'#---------------------FN_DYNVARS_001_09----------------------#'
SET @@global.histogram_size = 10;
SELECT @@histogram_size = @@global.histogram_size;
@@histogram_size = @@global.histogram_size
0
'#---------------------FN_DYNVARS_001_10----------------------#'
SET @@histogram_size = 100;
SELECT @@histogram_size = @@local.histogram_size;
@@histogram_size = @@local.histogram_size
1
SELECT @@local.histogram_size = @@session.histogram_size;
@@local.histogram_size = @@session.histogram_size
1
SET @@global.histogram_size = @start_global_value;
SELECT @@global.histogram_size;
@@global.histogram_size
0
SET @@session.histogram_size = @start_session_value;
SELECT @@session.histogram_size;
@@session.histogram_size
0

8
mysql-test/suite/sys_vars/r/optimizer_use_condition_selectivity_basic.result
View File

@ -40,6 +40,10 @@ SET @@global.optimizer_use_condition_selectivity = 3;
SELECT @@global.optimizer_use_condition_selectivity;
@@global.optimizer_use_condition_selectivity
3
SET @@global.optimizer_use_condition_selectivity = 4;
SELECT @@global.optimizer_use_condition_selectivity;
@@global.optimizer_use_condition_selectivity
4
'#--------------------FN_DYNVARS_115_04-------------------------#'
SELECT @@session.optimizer_use_condition_selectivity;
@@session.optimizer_use_condition_selectivity
@ -56,6 +60,10 @@ SET @@session.optimizer_use_condition_selectivity = 3;
SELECT @@session.optimizer_use_condition_selectivity;
@@session.optimizer_use_condition_selectivity
3
SET @@session.optimizer_use_condition_selectivity = 4;
SELECT @@session.optimizer_use_condition_selectivity;
@@session.optimizer_use_condition_selectivity
4
'#------------------FN_DYNVARS_115_05-----------------------#'
SET @@global.optimizer_use_condition_selectivity = ON;
ERROR 42000: Incorrect argument type to variable 'optimizer_use_condition_selectivity'

142
mysql-test/suite/sys_vars/t/histogram_size_basic.test Normal file
View File

@ -0,0 +1,142 @@
--source include/load_sysvars.inc
##############################################################
# START OF histogram_size TESTS #
##############################################################
#############################################################
# Save initial value #
#############################################################
SET @start_global_value = @@global.histogram_size;
SELECT @start_global_value;
SET @start_session_value = @@session.histogram_size;
SELECT @start_session_value;
--echo '#--------------------FN_DYNVARS_053_01-------------------------#'
################################################################
# Display the DEFAULT value of histogram_size #
################################################################
SET @@global.histogram_size = DEFAULT;
SELECT @@global.histogram_size;
SET @@session.histogram_size = DEFAULT;
SELECT @@session.histogram_size;
--echo '#--------------------FN_DYNVARS_053_03-------------------------#'
########################################################################
# Change the value of histogram_size to a valid value for GLOBAL Scope #
########################################################################
SET @@global.histogram_size = 1;
SELECT @@global.histogram_size;
SET @@global.histogram_size = 31;
SELECT @@global.histogram_size;
SET @@global.histogram_size = 255;
SELECT @@global.histogram_size;
--echo '#--------------------FN_DYNVARS_053_04-------------------------#'
#########################################################################
# Change the value of histogram_size to a valid value for SESSION Scope #
#########################################################################
SET @@session.histogram_size = 1;
SELECT @@session.histogram_size;
SET @@session.histogram_size = 31;
SELECT @@session.histogram_size;
SET @@session.histogram_size = 255;
SELECT @@session.histogram_size;
--echo '#------------------FN_DYNVARS_053_05-----------------------#'
##########################################################
# Change the value of histogram_size to an invalid value #
###########################################################
SET @@global.histogram_size = -1;
SELECT @@global.histogram_size;
SET @@global.histogram_size = 256;
SELECT @@global.histogram_size;
SET @@global.histogram_size = 1024;
SELECT @@global.histogram_size;
--Error ER_WRONG_TYPE_FOR_VAR
SET @@global.histogram_size = 4.5;
SELECT @@global.histogram_size;
--Error ER_WRONG_TYPE_FOR_VAR
SET @@global.histogram_size = test;
SELECT @@global.histogram_size;
SET @@session.histogram_size = -1;
SELECT @@session.histogram_size;
SET @@session.histogram_size = 256;
SELECT @@session.histogram_size;
SET @@session.histogram_size = 1024;
SELECT @@session.histogram_size;
--Error ER_WRONG_TYPE_FOR_VAR
SET @@session.histogram_size = 4.5;
SELECT @@session.histogram_size;
--Error ER_WRONG_TYPE_FOR_VAR
SET @@session.histogram_size = test;
SELECT @@session.histogram_size;
--echo '#------------------FN_DYNVARS_053_06-----------------------#'
####################################################################
# Check if the value in GLOBAL Table matches value in variable #
####################################################################
SELECT @@global.histogram_size = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='histogram_size';
--echo '#------------------FN_DYNVARS_053_07-----------------------#'
####################################################################
# Check if the value in SESSION Table matches value in variable #
####################################################################
SELECT @@session.histogram_size = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.SESSION_VARIABLES
WHERE VARIABLE_NAME='histogram_size';
--echo '#------------------FN_DYNVARS_053_08-----------------------#'
####################################################################
# Check if TRUE and FALSE values can be used on variable #
####################################################################
SET @@global.histogram_size = TRUE;
SET @@global.histogram_size = FALSE;
--echo '#---------------------FN_DYNVARS_001_09----------------------#'
#################################################################################
# Check if accessing variable with and without GLOBAL point to same variable #
#################################################################################
SET @@global.histogram_size = 10;
SELECT @@histogram_size = @@global.histogram_size;
--echo '#---------------------FN_DYNVARS_001_10----------------------#'
########################################################################################################
# Check if accessing variable with SESSION,LOCAL and without SCOPE points to same session variable #
########################################################################################################
SET @@histogram_size = 100;
SELECT @@histogram_size = @@local.histogram_size;
SELECT @@local.histogram_size = @@session.histogram_size;
####################################
# Restore initial value #
####################################
SET @@global.histogram_size = @start_global_value;
SELECT @@global.histogram_size;
SET @@session.histogram_size = @start_session_value;
SELECT @@session.histogram_size;
###################################################
# END OF histogram_size TESTS #
###################################################

4
mysql-test/suite/sys_vars/t/optimizer_use_condition_selectivity_basic.test
View File

@ -52,6 +52,8 @@ SET @@global.optimizer_use_condition_selectivity = 2;
SELECT @@global.optimizer_use_condition_selectivity;
SET @@global.optimizer_use_condition_selectivity = 3;
SELECT @@global.optimizer_use_condition_selectivity;
SET @@global.optimizer_use_condition_selectivity = 4;
SELECT @@global.optimizer_use_condition_selectivity;
--echo '#--------------------FN_DYNVARS_115_04-------------------------#'
@ -66,6 +68,8 @@ SET @@session.optimizer_use_condition_selectivity = 2;
SELECT @@session.optimizer_use_condition_selectivity;
SET @@session.optimizer_use_condition_selectivity = 3;
SELECT @@session.optimizer_use_condition_selectivity;
SET @@session.optimizer_use_condition_selectivity = 4;
SELECT @@session.optimizer_use_condition_selectivity;
--echo '#------------------FN_DYNVARS_115_05-----------------------#'

22
mysql-test/t/selectivity.test
View File

@ -16,6 +16,7 @@ CREATE DATABASE dbt3_s001;
use dbt3_s001;
set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
set @save_histogram_size=@@histogram_size;
--disable_query_log
--disable_result_log
@ -58,8 +59,29 @@ set optimizer_use_condition_selectivity=3;
eval EXPLAIN EXTENDED $Q20;
eval $Q20;
set histogram_size=15;
flush table part;
ANALYZE TABLE part PERSISTENT FOR COLUMNS(p_name) INDEXES();
set optimizer_use_condition_selectivity=4;
eval EXPLAIN EXTENDED $Q20;
eval $Q20;
set histogram_size=24;
flush table nation;
ANALYZE TABLE nation PERSISTENT FOR COLUMNS(n_name) INDEXES();
eval EXPLAIN EXTENDED $Q20;
eval $Q20;
DROP DATABASE dbt3_s001;
set histogram_size=@save_histogram_size;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
set use_stat_tables=@save_use_stat_tables;

17
mysql-test/t/statistics.test
View File

@ -165,6 +165,23 @@ SELECT
WHERE t1.e IS NOT NULL AND t1.b IS NOT NULL AND t1.d IS NOT NULL)
AS 'ARITY 3';
DELETE FROM mysql.column_stats;
set histogram_size=4;
ANALYZE TABLE t1;
SELECT db_name, table_name, column_name,
min_value, max_value,
nulls_ratio, avg_frequency,
hist_size, HEX(histogram)
FROM mysql.column_stats;
DELETE FROM mysql.column_stats;
set histogram_size= 0;
ANALYZE TABLE t1;
CREATE TABLE t3 (
a int NOT NULL PRIMARY KEY,
b varchar(32),

2
scripts/mysql_system_tables.sql
View File

@ -108,6 +108,6 @@ set @had_proxies_priv_table= @@warning_count != 0;
CREATE TABLE IF NOT EXISTS table_stats (db_name varchar(64) NOT NULL, table_name varchar(64) NOT NULL, cardinality bigint(21) unsigned DEFAULT NULL, PRIMARY KEY (db_name,table_name) ) ENGINE=MyISAM CHARACTER SET utf8 COLLATE utf8_bin comment='Statistics on Tables';
CREATE TABLE IF NOT EXISTS column_stats (db_name varchar(64) NOT NULL, table_name varchar(64) NOT NULL, column_name varchar(64) NOT NULL, min_value varchar(255) DEFAULT NULL, max_value varchar(255) DEFAULT NULL, nulls_ratio decimal(12,4) DEFAULT NULL, avg_length decimal(12,4) DEFAULT NULL, avg_frequency decimal(12,4) DEFAULT NULL, PRIMARY KEY (db_name,table_name,column_name) ) ENGINE=MyISAM CHARACTER SET utf8 COLLATE utf8_bin comment='Statistics on Columns';
CREATE TABLE IF NOT EXISTS column_stats (db_name varchar(64) NOT NULL, table_name varchar(64) NOT NULL, column_name varchar(64) NOT NULL, min_value varchar(255) DEFAULT NULL, max_value varchar(255) DEFAULT NULL, nulls_ratio decimal(12,4) DEFAULT NULL, avg_length decimal(12,4) DEFAULT NULL, avg_frequency decimal(12,4) DEFAULT NULL, hist_size tinyint unsigned, histogram varbinary(255), PRIMARY KEY (db_name,table_name,column_name) ) ENGINE=MyISAM CHARACTER SET utf8 COLLATE utf8_bin comment='Statistics on Columns';
CREATE TABLE IF NOT EXISTS index_stats (db_name varchar(64) NOT NULL, table_name varchar(64) NOT NULL, index_name varchar(64) NOT NULL, prefix_arity int(11) unsigned NOT NULL, avg_frequency decimal(12,4) DEFAULT NULL, PRIMARY KEY (db_name,table_name,index_name,prefix_arity) ) ENGINE=MyISAM CHARACTER SET utf8 COLLATE utf8_bin comment='Statistics on Indexes';

13
sql/field.cc
View File

@ -8420,6 +8420,19 @@ my_decimal *Field_bit::val_decimal(my_decimal *deciaml_value)
}
double Field_bit::middle_point_pos(Field *min, Field *max)
{
double n, d;
n= val_real() - min->val_real();
if (n < 0)
return 0.0;
d= max->val_real() - min->val_real();
if (d <= 0)
return 1.0;
return min(n/d, 1.0);
}
/*
Compare two bit fields using pointers within the record.
SYNOPSIS

9
sql/field.h
View File

@ -472,6 +472,10 @@ public:
}
return update_fl;
}
virtual void store_field_value(uchar *val, uint len)
{
memcpy(ptr, val, len);
}
virtual uint decimals() const { return 0; }
/*
Caller beware: sql_type can change str.Ptr, so check
@ -2299,6 +2303,11 @@ public:
}
return update_fl;
}
void store_field_value(uchar *val, uint len)
{
store(*((longlong *)val), TRUE);
}
double middle_point_pos(Field *min, Field *max);
void get_image(uchar *buff, uint length, CHARSET_INFO *cs)
{ get_key_image(buff, length, itRAW); }
void set_image(const uchar *buff,uint length, CHARSET_INFO *cs)

113
sql/opt_range.cc
View File

@ -3324,60 +3324,64 @@ bool calculate_cond_selectivity_for_table(THD *thd, TABLE *table, Item *cond)
table->cond_selectivity= 1.0;
if (bitmap_is_clear_all(used_fields))
DBUG_RETURN(FALSE);
PARAM param;
MEM_ROOT alloc;
init_sql_alloc(&alloc, thd->variables.range_alloc_block_size, 0,
MYF(MY_THREAD_SPECIFIC));
param.thd= thd;
param.mem_root= &alloc;
param.old_root= thd->mem_root;
param.table= table;
param.is_ror_scan= FALSE;
if (create_key_parts_for_pseudo_indexes(&param, used_fields))
if (!bitmap_is_clear_all(used_fields))
{
free_root(&alloc, MYF(0));
DBUG_RETURN(FALSE);
}
param.prev_tables= param.read_tables= 0;
param.current_table= table->map;
param.using_real_indexes= FALSE;
param.real_keynr[0]= 0;
param.alloced_sel_args= 0;
thd->no_errors=1; // Don't warn about NULL
SEL_TREE *tree;
SEL_ARG **key, **end;
uint idx= 0;
PARAM param;
MEM_ROOT alloc;
SEL_TREE *tree;
SEL_ARG **key, **end;
uint idx= 0;
tree= get_mm_tree(&param, cond);
init_sql_alloc(&alloc, thd->variables.range_alloc_block_size, 0,
MYF(MY_THREAD_SPECIFIC));
param.thd= thd;
param.mem_root= &alloc;
param.old_root= thd->mem_root;
param.table= table;
param.is_ror_scan= FALSE;
if (!tree)
goto end;
for (key= tree->keys, end= key + param.keys; key != end; key++, idx++)
{
double rows;
if (*key)
if (create_key_parts_for_pseudo_indexes(&param, used_fields))
{
rows= records_in_column_ranges(&param, idx, *key);
if (rows != HA_POS_ERROR)
(*key)->field->cond_selectivity= rows/table_records;
free_root(&alloc, MYF(0));
goto free_alloc;
}
}
for (Field **field_ptr= table->field; *field_ptr; field_ptr++)
{
Field *table_field= *field_ptr;
if (bitmap_is_set(table->read_set, table_field->field_index) &&
table_field->cond_selectivity < 1.0)
table->cond_selectivity*= table_field->cond_selectivity;
param.prev_tables= param.read_tables= 0;
param.current_table= table->map;
param.using_real_indexes= FALSE;
param.real_keynr[0]= 0;
param.alloced_sel_args= 0;
thd->no_errors=1;
tree= get_mm_tree(&param, cond);
if (!tree)
goto free_alloc;
for (key= tree->keys, end= key + param.keys; key != end; key++, idx++)
{
double rows;
if (*key)
{
rows= records_in_column_ranges(&param, idx, *key);
if (rows != HA_POS_ERROR)
(*key)->field->cond_selectivity= rows/table_records;
}
}
for (Field **field_ptr= table->field; *field_ptr; field_ptr++)
{
Field *table_field= *field_ptr;
if (bitmap_is_set(table->read_set, table_field->field_index) &&
table_field->cond_selectivity < 1.0)
table->cond_selectivity*= table_field->cond_selectivity;
}
free_alloc:
thd->mem_root= param.old_root;
free_root(&alloc, MYF(0));
}
/* Calculate the selectivity of the range conditions supported by indexes */
@ -3412,17 +3416,18 @@ bool calculate_cond_selectivity_for_table(THD *thd, TABLE *table, Item *cond)
}
if (i)
{
double f1= key_info->actual_rec_per_key(i-1);
double f2= key_info->actual_rec_per_key(i);
table->cond_selectivity*= quick_cond_selectivity * f1 / f2;
table->cond_selectivity*= quick_cond_selectivity;
if (i != used_key_parts)
{
double f1= key_info->actual_rec_per_key(i-1);
double f2= key_info->actual_rec_per_key(i);
table->cond_selectivity*= f1 / f2;
}
}
}
}
}
end:
thd->mem_root= param.old_root;
free_root(&alloc, MYF(0));
DBUG_RETURN(FALSE);
}

1
sql/sql_class.h
View File

@ -501,6 +501,7 @@ typedef struct system_variables
ulong optimizer_search_depth;
ulong optimizer_use_condition_selectivity;
ulong use_stat_tables;
ulong histogram_size;
ulong preload_buff_size;
ulong profiling_history_size;
ulong read_buff_size;

6
sql/sql_select.cc
View File

@ -6988,8 +6988,10 @@ double table_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
/* Discount the selectivity of the access method used to join table s */
if (s->quick && s->quick->index != MAX_KEY)
{
/* A range scan by index s->quick->index is used to access table s */
sel*= table_records/table->quick_rows[s->quick->index];
if (join->positions[idx].key == 0)
{
sel*= table->quick_rows[s->quick->index]/table_records;
}
}
else if (ref)
{

326
sql/sql_statistics.cc
View File

@ -889,7 +889,7 @@ public:
char buff[MAX_FIELD_WIDTH];
String val(buff, sizeof(buff), &my_charset_utf8_bin);
for (uint i= COLUMN_STAT_MIN_VALUE; i <= COLUMN_STAT_AVG_FREQUENCY; i++)
for (uint i= COLUMN_STAT_MIN_VALUE; i <= COLUMN_STAT_HISTOGRAM; i++)
{
Field *stat_field= stat_table->field[i];
if (table_field->collected_stats->is_null(i))
@ -924,7 +924,17 @@ public:
break;
case COLUMN_STAT_AVG_FREQUENCY:
stat_field->store(table_field->collected_stats->get_avg_frequency());
break;
break;
case COLUMN_STAT_HIST_SIZE:
stat_field->store(table_field->collected_stats->histogram.get_size());
break;
case COLUMN_STAT_HISTOGRAM:
const char * col_histogram=
(const char *) (table_field->collected_stats->histogram.get_values());
stat_field->store(col_histogram,
table_field->collected_stats->histogram.get_size(),
&my_charset_bin);
break;
}
}
}
@ -961,7 +971,7 @@ public:
char buff[MAX_FIELD_WIDTH];
String val(buff, sizeof(buff), &my_charset_utf8_bin);
for (uint i= COLUMN_STAT_MIN_VALUE; i <= COLUMN_STAT_AVG_FREQUENCY; i++)
for (uint i= COLUMN_STAT_MIN_VALUE; i <= COLUMN_STAT_HIST_SIZE; i++)
{
Field *stat_field= stat_table->field[i];
@ -993,6 +1003,9 @@ public:
break;
case COLUMN_STAT_AVG_FREQUENCY:
table_field->read_stats->set_avg_frequency(stat_field->val_real());
break;
case COLUMN_STAT_HIST_SIZE:
table_field->read_stats->histogram.set_size(stat_field->val_int());
break;
}
}
@ -1000,6 +1013,21 @@ public:
}
}
void get_histogram_value()
{
if (find_stat())
{
char buff[MAX_FIELD_WIDTH];
String val(buff, sizeof(buff), &my_charset_utf8_bin);
uint fldno= COLUMN_STAT_HISTOGRAM;
Field *stat_field= stat_table->field[fldno];
table_field->read_stats->set_not_null(fldno);
stat_field->val_str(&val);
memcpy(table_field->read_stats->histogram.get_values(),
val.ptr(), table_field->read_stats->histogram.get_size());
}
}
};
@ -1202,6 +1230,72 @@ public:
};
class Histogram_builder
{
Field *column;
uint col_length;
ha_rows records;
Field *min_value;
Field *max_value;
Histogram *histogram;
uint hist_size;
double bucket_capacity;
uint curr_bucket;
ulonglong count;
ulonglong count_distinct;
public:
Histogram_builder(Field *col, uint col_len, ha_rows rows)
: column(col), col_length(col_len), records(rows)
{
Column_statistics *col_stats= col->collected_stats;
min_value= col_stats->min_value;
max_value= col_stats->max_value;
histogram= &col_stats->histogram;
hist_size= histogram->get_size();
bucket_capacity= (double) records / (hist_size + 1);
curr_bucket= 0;
count= 0;
count_distinct= 0;
}
ulonglong get_count_distinct() { return count_distinct; }
int next(void *elem, element_count elem_cnt)
{
count_distinct++;
count+= elem_cnt;
if (curr_bucket == hist_size)
return 0;
if (count > bucket_capacity * (curr_bucket + 1))
{
column->store_field_value((uchar *) elem, col_length);
histogram->set_value(curr_bucket,
column->middle_point_pos(min_value, max_value));
curr_bucket++;
while (curr_bucket != hist_size &&
count > bucket_capacity * (curr_bucket + 1))
{
histogram->set_prev_value(curr_bucket);
curr_bucket++;
}
}
return 0;
}
};
C_MODE_START
int histogram_build_walk(void *elem, element_count elem_cnt, void *arg)
{
Histogram_builder *hist_builder= (Histogram_builder *) arg;
return hist_builder->next(elem, elem_cnt);
}
C_MODE_END
/*
The class Count_distinct_field is a helper class used to calculate
the number of distinct values for a column. The class employs the
@ -1221,6 +1315,8 @@ protected:
uint tree_key_length; /* The length of the keys for the elements of 'tree */
public:
Count_distinct_field() {}
/**
@param
@ -1239,27 +1335,10 @@ public:
Count_distinct_field(Field *field, uint max_heap_table_size)
{
qsort_cmp2 compare_key;
void* cmp_arg;
enum enum_field_types f_type= field->type();
table_field= field;
tree_key_length= field->pack_length();
if ((f_type == MYSQL_TYPE_VARCHAR) ||
(!field->binary() && (f_type == MYSQL_TYPE_STRING ||
f_type == MYSQL_TYPE_VAR_STRING)))
{
compare_key= (qsort_cmp2) simple_str_key_cmp;
cmp_arg= (void*) field;
}
else
{
cmp_arg= (void*) &tree_key_length;
compare_key= (qsort_cmp2) simple_raw_key_cmp;
}
tree= new Unique(compare_key, cmp_arg,
tree= new Unique((qsort_cmp2) simple_str_key_cmp, (void*) field,
tree_key_length, max_heap_table_size);
}
@ -1300,9 +1379,36 @@ public:
tree->walk(table_field->table, count_distinct_walk, (void*) &count);
return count;
}
ulonglong get_value_with_histogram(ha_rows rows)
{
Histogram_builder hist_builder(table_field, tree_key_length, rows);
tree->walk(table_field->table, histogram_build_walk, (void *) &hist_builder);
return hist_builder.get_count_distinct();
}
uint get_hist_size()
{
return table_field->collected_stats->histogram.get_size();
}
uchar *get_histogram()
{
return table_field->collected_stats->histogram.get_values();
}
};
static
int simple_ulonglong_key_cmp(void* arg, uchar* key1, uchar* key2)
{
ulonglong *val1= (ulonglong *) key1;
ulonglong *val2= (ulonglong *) key2;
return *val1 > *val2 ? 1 : *val1 == *val2 ? 0 : -1;
}
/*
The class Count_distinct_field_bit is derived from the class
Count_distinct_field to be used only for fields of the MYSQL_TYPE_BIT type.
@ -1312,8 +1418,17 @@ public:
class Count_distinct_field_bit: public Count_distinct_field
{
public:
Count_distinct_field_bit(Field *field, uint max_heap_table_size)
:Count_distinct_field(field, max_heap_table_size) {}
{
table_field= field;
tree_key_length= sizeof(ulonglong);
tree= new Unique((qsort_cmp2) simple_ulonglong_key_cmp,
(void*) &tree_key_length,
tree_key_length, max_heap_table_size);
}
bool add()
{
longlong val= table_field->val_int();
@ -1672,13 +1787,26 @@ int alloc_statistics_for_table(THD* thd, TABLE *table)
ulong *idx_avg_frequency= (ulong*) alloc_root(&table->mem_root,
sizeof(ulong) * key_parts);
if (!table_stats || !column_stats || !index_stats || !idx_avg_frequency)
uint columns= 0;
for (field_ptr= table->field; *field_ptr; field_ptr++)
{
if (bitmap_is_set(table->read_set, (*field_ptr)->field_index))
columns++;
}
uint hist_size= thd->variables.histogram_size;
uchar *histogram= NULL;
if (hist_size > 0)
histogram= (uchar *) alloc_root(&table->mem_root, hist_size * columns);
if (!table_stats || !column_stats || !index_stats || !idx_avg_frequency ||
(hist_size && !histogram))
DBUG_RETURN(1);
table->collected_stats= table_stats;
table_stats->column_stats= column_stats;
table_stats->index_stats= index_stats;
table_stats->idx_avg_frequency= idx_avg_frequency;
table_stats->histograms= histogram;
memset(column_stats, 0, sizeof(Column_statistics) * (fields+1));
@ -1687,6 +1815,12 @@ int alloc_statistics_for_table(THD* thd, TABLE *table)
(*field_ptr)->collected_stats= column_stats;
(*field_ptr)->collected_stats->max_value= NULL;
(*field_ptr)->collected_stats->min_value= NULL;
if (bitmap_is_set(table->read_set, (*field_ptr)->field_index))
{
column_stats->histogram.set_size(hist_size);
column_stats->histogram.set_values(histogram);
histogram+= hist_size;
}
}
memset(idx_avg_frequency, 0, sizeof(ulong) * key_parts);
@ -1903,10 +2037,51 @@ int alloc_statistics_for_table_share(THD* thd, TABLE_SHARE *table_share,
if (!is_safe)
mysql_mutex_unlock(&table_share->LOCK_ha_data);
DBUG_RETURN(0);
}
static
int alloc_histograms_for_table_share(THD* thd, TABLE_SHARE *table_share,
bool is_safe)
{
TABLE_STATISTICS_CB *stats_cb= &table_share->stats_cb;
DBUG_ENTER("alloc_histograms_for_table_share");
if (!is_safe)
mysql_mutex_lock(&table_share->LOCK_ha_data);
if (stats_cb->histograms_can_be_read)
{
if (!is_safe)
mysql_mutex_unlock(&table_share->LOCK_ha_data);
DBUG_RETURN(0);
}
Table_statistics *table_stats= stats_cb->table_stats;
ulong total_hist_size= table_stats->total_hist_size;
if (total_hist_size && !table_stats->histograms)
{
uchar *histograms= (uchar *) alloc_root(&stats_cb->mem_root,
total_hist_size);
if (!histograms)
{
if (!is_safe)
mysql_mutex_unlock(&table_share->LOCK_ha_data);
DBUG_RETURN(1);
}
memset(histograms, 0, total_hist_size);
table_stats->histograms= histograms;
stats_cb->histograms_can_be_read= TRUE;
}
if (!is_safe)
mysql_mutex_unlock(&table_share->LOCK_ha_data);
DBUG_RETURN(0);
}
/**
@brief
@ -2006,14 +2181,28 @@ void Column_statistics_collected::finish(ha_rows rows)
set_not_null(COLUMN_STAT_AVG_LENGTH);
}
if (count_distinct)
{
ulonglong distincts= count_distinct->get_value();
{
ulonglong distincts;
uint hist_size= count_distinct->get_hist_size();
if (hist_size == 0)
distincts= count_distinct->get_value();
else
distincts= count_distinct->get_value_with_histogram(rows - nulls);
if (distincts)
{
val= (double) (rows - nulls) / distincts;
set_avg_frequency(val);
set_not_null(COLUMN_STAT_AVG_FREQUENCY);
}
else
hist_size= 0;
histogram.set_size(hist_size);
set_not_null(COLUMN_STAT_HIST_SIZE);
if (hist_size && distincts)
{
histogram.set_values(count_distinct->get_histogram());
set_not_null(COLUMN_STAT_HISTOGRAM);
}
delete count_distinct;
count_distinct= NULL;
}
@ -2234,16 +2423,19 @@ int collect_statistics_for_table(THD *thd, TABLE *table)
table->collected_stats->cardinality= rows;
}
bitmap_clear_all(table->write_set);
for (field_ptr= table->field; *field_ptr; field_ptr++)
{
table_field= *field_ptr;
if (!bitmap_is_set(table->read_set, table_field->field_index))
continue;
bitmap_set_bit(table->write_set, table_field->field_index);
if (!rc)
table_field->collected_stats->finish(rows);
else
table_field->collected_stats->cleanup();
}
bitmap_clear_all(table->write_set);
if (!rc)
{
@ -2421,6 +2613,7 @@ int read_statistics_for_table(THD *thd, TABLE *table, TABLE_LIST *stat_tables)
Field **field_ptr;
KEY *key_info, *key_info_end;
TABLE_SHARE *table_share= table->s;
Table_statistics *read_stats= table_share->stats_cb.table_stats;
DBUG_ENTER("read_statistics_for_table");
@ -2432,16 +2625,18 @@ int read_statistics_for_table(THD *thd, TABLE *table, TABLE_LIST *stat_tables)
/* Read statistics from the statistical table column_stats */
stat_table= stat_tables[COLUMN_STAT].table;
ulong total_hist_size= 0;
Column_stat column_stat(stat_table, table);
for (field_ptr= table_share->field; *field_ptr; field_ptr++)
{
table_field= *field_ptr;
column_stat.set_key_fields(table_field);
column_stat.get_stat_values();
total_hist_size+= table_field->read_stats->histogram.get_size();
}
read_stats->total_hist_size= total_hist_size;
/* Read statistics from the statistical table index_stats */
Table_statistics *read_stats= table_share->stats_cb.table_stats;
stat_table= stat_tables[INDEX_STAT].table;
Index_stat index_stat(stat_table, table);
for (key_info= table_share->key_info,
@ -2559,10 +2754,14 @@ bool statistics_for_tables_is_needed(THD *thd, TABLE_LIST *tables)
TABLE_SHARE *table_share= tl->table->s;
if (table_share &&
table_share->stats_cb.stats_can_be_read &&
!table_share->stats_cb.stats_is_read)
(!table_share->stats_cb.stats_is_read ||
(!table_share->stats_cb.histograms_are_read &&
thd->variables.optimizer_use_condition_selectivity > 3)))
return TRUE;
if (table_share->stats_cb.stats_is_read)
tl->table->stats_is_read= TRUE;
if (table_share->stats_cb.histograms_are_read)
tl->table->histograms_are_read= TRUE;
}
}
@ -2570,6 +2769,41 @@ bool statistics_for_tables_is_needed(THD *thd, TABLE_LIST *tables)
}
static
int read_histograms_for_table(THD *thd, TABLE *table, TABLE_LIST *stat_tables)
{
TABLE_SHARE *table_share= table->s;
DBUG_ENTER("read_histograms_for_table");
if (!table_share->stats_cb.histograms_can_be_read)
{
(void) alloc_histograms_for_table_share(thd, table_share, FALSE);
}
if (table_share->stats_cb.histograms_can_be_read &&
!table_share->stats_cb.histograms_are_read)
{
Field **field_ptr;
uchar *histogram= table_share->stats_cb.table_stats->histograms;
TABLE *stat_table= stat_tables[COLUMN_STAT].table;
Column_stat column_stat(stat_table, table);
for (field_ptr= table_share->field; *field_ptr; field_ptr++)
{
Field *table_field= *field_ptr;
uint hist_size= table_field->read_stats->histogram.get_size();
if (hist_size)
{
column_stat.set_key_fields(table_field);
table_field->read_stats->histogram.set_values(histogram);
column_stat.get_histogram_value();
histogram+= hist_size;
}
}
}
DBUG_RETURN(0);
}
/**
@brief
Read statistics for tables from a table list if it is needed
@ -2597,7 +2831,7 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables)
TABLE_LIST stat_tables[STATISTICS_TABLES];
Open_tables_backup open_tables_backup;
DBUG_ENTER("read_statistics_for_table_if_needed");
DBUG_ENTER("read_statistics_for_tables_if_needed");
DEBUG_SYNC(thd, "statistics_read_start");
@ -2624,6 +2858,14 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables)
}
if (table_share->stats_cb.stats_is_read)
tl->table->stats_is_read= TRUE;
if (thd->variables.optimizer_use_condition_selectivity > 3 &&
table_share && !table_share->stats_cb.histograms_are_read)
{
(void) read_histograms_for_table(thd, tl->table, stat_tables);
table_share->stats_cb.histograms_are_read= TRUE;
}
if (table_share->stats_cb.stats_is_read)
tl->table->histograms_are_read= TRUE;
}
}
@ -3083,20 +3325,40 @@ double get_column_range_cardinality(Field *field,
res= table->stat_records();
else if (min_endp->length == max_endp->length &&
!memcmp(min_endp->key, max_endp->key, min_endp->length))
{
res= col_stats->get_avg_frequency();
{
double avg_frequency= col_stats->get_avg_frequency();
res= avg_frequency;
if (avg_frequency > 1.0 + 0.000001 &&
col_stats->min_value && col_stats->max_value)
{
Histogram *hist= &col_stats->histogram;
if (hist->get_size() > 0)
{
double pos= field->middle_point_pos(col_stats->min_value,
col_stats->max_value);
res= table->stat_records() *
hist->point_selectivity(pos,
avg_frequency / table->stat_records());
}
}
}
else
{
if (col_stats->min_value && col_stats->max_value)
{
double sel;
store_key_image_to_rec(field, (uchar *) min_endp->key, min_endp->length);
double min_mp_pos= field->middle_point_pos(col_stats->min_value,
col_stats->max_value);
store_key_image_to_rec(field, (uchar *) max_endp->key, max_endp->length);
double max_mp_pos= field->middle_point_pos(col_stats->min_value,
col_stats->max_value);
res= table->stat_records() * (max_mp_pos - min_mp_pos);
Histogram *hist= &col_stats->histogram;
if (hist->get_size() == 0)
sel= (max_mp_pos - min_mp_pos);
else
sel= hist->range_selectivity(min_mp_pos, max_mp_pos);
res= table->stat_records() * sel;
}
else
res= table->stat_records();

124
sql/sql_statistics.h
View File

@ -16,15 +16,6 @@
#ifndef SQL_STATISTICS_H
#define SQL_STATISTICS_H
/*
These enumeration types comprise the dictionary of three
statistical tables table_stat, column_stat and index_stat
as they defined in ../scripts/mysql_system_tables.sql.
It would be nice if the declarations of these types were
generated automatically by the table definitions.
*/
typedef
enum enum_use_stat_tables_mode
{
@ -40,6 +31,16 @@ enum enum_stat_tables
INDEX_STAT,
};
/*
These enumeration types comprise the dictionary of three
statistical tables table_stat, column_stat and index_stat
as they defined in ../scripts/mysql_system_tables.sql.
It would be nice if the declarations of these types were
generated automatically by the table definitions.
*/
enum enum_table_stat_col
{
TABLE_STAT_DB_NAME,
@ -56,7 +57,9 @@ enum enum_column_stat_col
COLUMN_STAT_MAX_VALUE,
COLUMN_STAT_NULLS_RATIO,
COLUMN_STAT_AVG_LENGTH,
COLUMN_STAT_AVG_FREQUENCY
COLUMN_STAT_AVG_FREQUENCY,
COLUMN_STAT_HIST_SIZE,
COLUMN_STAT_HISTOGRAM
};
enum enum_index_stat_col
@ -96,6 +99,98 @@ double get_column_range_cardinality(Field *field,
key_range *min_endp,
key_range *max_endp);
#define HIST_FACTOR 255
#define INV_HIST_FACTOR ((double) 1.0 / HIST_FACTOR)
class Histogram
{
private:
public:
private:
uint8 size;
uint8 *values;
uint find_bucket(double pos, bool first)
{
uint8 val= (uint8) (pos * HIST_FACTOR);
int lp= 0;
int rp= size - 1;
int i= 0;
for (int d= size / 2 ; d; d= (rp - lp) / 2)
{
i= lp + d;
if (val == values[i])
break;
if (val < values[i])
rp= i;
else if (val > values[i + 1])
lp= i + 1;
else
break;
}
if (val == values[i])
{
if (first)
{
while(i && val == values[i - 1])
i--;
}
else
{
while(i + 1 < size && val == values[i + 1])
i++;
}
}
return i;
}
public:
uint get_size() { return (uint) size; }
uchar *get_values() { return (uchar *) values; }
void set_size (ulonglong sz) { size= (uint8) sz; }
void set_values (uchar *vals) { values= (uint8 *) vals; }
void set_value(uint i, double val)
{
values[i]= (uint8) (val * HIST_FACTOR);
}
void set_prev_value(uint i) { values[i]= values[i-1]; }
double range_selectivity(double min_pos, double max_pos)
{
double sel;
double bucket_sel= 1.0/(size + 1);
uint min= find_bucket(min_pos, TRUE);
uint max= find_bucket(max_pos, FALSE);
sel= bucket_sel * (max - min + 1);
return sel;
}
double point_selectivity(double pos, double avg_sel)
{
double sel;
double bucket_sel= 1.0/(size + 1);
uint min= find_bucket(pos, TRUE);
uint max= min;
while (max + 1 < size && values[max + 1] == values[max])
max++;
double width= ((max + 1 == size ? 1.0 : values[max]) -
(min == 0 ? 0.0 : values[min-1])) *
INV_HIST_FACTOR;
sel= avg_sel * (bucket_sel * (max + 1 - min)) / width;
return sel;
}
};
class Columns_statistics;
class Index_statistics;
@ -111,8 +206,9 @@ public:
uchar *min_max_record_buffers; /* Record buffers for min/max values */
Column_statistics *column_stats; /* Array of statistical data for columns */
Index_statistics *index_stats; /* Array of statistical data for indexes */
ulong *idx_avg_frequency; /* Array of records per key for index prefixes */
ulong *idx_avg_frequency; /* Array of records per key for index prefixes */
ulong total_hist_size;
uchar *histograms; /* Sequence of histograms */
};
@ -167,10 +263,12 @@ private:
public:
Histogram histogram;
void set_all_nulls()
{
column_stat_nulls=
((1 << (COLUMN_STAT_AVG_FREQUENCY-COLUMN_STAT_COLUMN_NAME))-1) <<
((1 << (COLUMN_STAT_HISTOGRAM-COLUMN_STAT_COLUMN_NAME))-1) <<
(COLUMN_STAT_COLUMN_NAME+1);
}

20
sql/sys_vars.cc
View File

@ -1431,14 +1431,17 @@ static Sys_var_ulong Sys_optimizer_use_condition_selectivity(
"for the best execution plan "
"Meaning: "
"1 - use selectivity of index backed range conditions to calculate "
"cardinality of the partial join if the last joined table is "
"accessed by full table scan or an index scan "
"the cardinality of a partial join if the last joined table is "
"accessed by full table scan or an index scan, "
"2 - use selectivity of index backed range conditions to calculate "
"cardinality of the partial join in any case "
"the cardinality of a partial join in any case, "
"3 - additionally always use selectivity of range conditions that are "
"not backed by any index to calculate cardinality of the partial join",
"not backed by any index to calculate the cardinality of a partial join, "
"4 - use histograms to calculate selectivity of range conditions that "
"are not backed by any index to calculate the cardinality of "
"a partial join.",
SESSION_VAR(optimizer_use_condition_selectivity), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 3), DEFAULT(1), BLOCK_SIZE(1));
VALID_RANGE(1, 4), DEFAULT(1), BLOCK_SIZE(1));
/** Warns about deprecated value 63 */
static bool fix_optimizer_search_depth(sys_var *self, THD *thd,
@ -3767,6 +3770,13 @@ static Sys_var_enum Sys_optimizer_use_stat_tables(
SESSION_VAR(use_stat_tables), CMD_LINE(REQUIRED_ARG),
use_stat_tables_modes, DEFAULT(0));
static Sys_var_ulong Sys_histogram_size(
"histogram_size",
"Number of bytes used for a histogram. "
"If set to 0, no histograms are created by ANALYZE.",
SESSION_VAR(histogram_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 255), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_mybool Sys_no_thread_alarm(
"debug_no_thread_alarm",
"Disable system thread alarm calls. Disabling it may be useful "

2
sql/table.cc
View File

@ -432,6 +432,8 @@ void TABLE_SHARE::destroy()
free_root(&stats_cb.mem_root, MYF(0));
stats_cb.stats_can_be_read= FALSE;
stats_cb.stats_is_read= FALSE;
stats_cb.histograms_can_be_read= FALSE;
stats_cb.histograms_are_read= FALSE;
if (tmp_table == NO_TMP_TABLE)
mysql_mutex_unlock(&LOCK_ha_data);

5
sql/table.h
View File

@ -573,7 +573,9 @@ struct TABLE_STATISTICS_CB
Table_statistics *table_stats; /* Structure to access the statistical data */
bool stats_can_be_read; /* Memory for statistical data is allocated */
bool stats_is_read; /* Statistical data for table has been read
from statistical tables */
from statistical tables */
bool histograms_can_be_read;
bool histograms_are_read;
};
@ -1200,6 +1202,7 @@ public:
#endif
uint max_keys; /* Size of allocated key_info array. */
bool stats_is_read; /* Persistent statistics is read for the table */
bool histograms_are_read;
MDL_ticket *mdl_ticket;
void init(THD *thd, TABLE_LIST *tl);