MDEV-18551: New defaults for eq_range_index_dive_limit

The value for eq_range_index_dive_limit is increased to 200.

8 files changed, 149 insertions, 86 deletions

diff --git a/mysql-test/main/mysqld--help.result b/mysql-test/main/mysqld--help.result
index a547a978a01..e130f324da0 100644
--- a/mysql-test/main/mysqld--help.result
+++ b/mysql-test/main/mysqld--help.result
@@ -1436,7 +1436,7 @@ encrypt-binlog FALSE
 encrypt-tmp-disk-tables FALSE
 encrypt-tmp-files FALSE
 enforce-storage-engine (No default value)
-eq-range-index-dive-limit 10
+eq-range-index-dive-limit 200
 event-scheduler OFF
 expensive-subquery-limit 100
 expire-logs-days 0
diff --git a/mysql-test/main/range.result b/mysql-test/main/range.result
index bcb43d1e905..9a2d99e2f82 100644
--- a/mysql-test/main/range.result
+++ b/mysql-test/main/range.result
@@ -3100,6 +3100,26 @@ a	b
 set eq_range_index_dive_limit=default;
 drop table t1;
 #
+# MDEV-18551: New defaults for eq_range_index_dive_limit
+#
+create table ten(a int);
+insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t1(a int, key(a));
+insert into t1 select A.a + B.a*10 + C.a*100 from ten A, ten B,ten C;
+insert into t1 select 1 from ten A, ten B,ten C;
+create table t2(a int, key(a));
+insert into t2 select A.a + B.a*10 + C.a*100 from ten A, ten B,ten C where A.a + B.a*10 + C.a*100 < 199;
+# expected type=range, rows=1487 , reason=using index dives
+analyze SELECT * FROM t1 where a in (0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	1487	1199.00	100.00	100.00	Using where; Using index
+insert into t2 values (200),(201);
+# expected type=range, rows=201 , reason=using index statistics
+analyze SELECT * FROM t1 where a in (0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,200,201);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	201	1201.00	100.00	100.00	Using where; Using index
+drop table t1,ten,t2;
+#
 # End of 10.2 tests
 #
 set global innodb_stats_persistent= @innodb_stats_persistent_save;
diff --git a/mysql-test/main/range.test b/mysql-test/main/range.test
index 9edb3f39ae3..76d893f56b7 100644
--- a/mysql-test/main/range.test
+++ b/mysql-test/main/range.test
@@ -2075,6 +2075,29 @@ set eq_range_index_dive_limit=default;
 drop table t1;
 
 --echo #
+--echo # MDEV-18551: New defaults for eq_range_index_dive_limit
+--echo #
+
+create table ten(a int);
+insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t1(a int, key(a));
+insert into t1 select A.a + B.a*10 + C.a*100 from ten A, ten B,ten C;
+insert into t1 select 1 from ten A, ten B,ten C;
+
+create table t2(a int, key(a));
+insert into t2 select A.a + B.a*10 + C.a*100 from ten A, ten B,ten C where A.a + B.a*10 + C.a*100 < 199;
+
+let $a= `select group_concat(a) from t2`;
+
+--echo # expected type=range, rows=1487 , reason=using index dives
+eval analyze SELECT * FROM t1 where a in ($a);
+insert into t2 values (200),(201);
+let $a= `select group_concat(a) from t2`;
+--echo # expected type=range, rows=201 , reason=using index statistics
+eval analyze SELECT * FROM t1 where a in ($a);
+drop table t1,ten,t2;
+
+--echo #
 --echo # End of 10.2 tests
 --echo #
 
diff --git a/mysql-test/main/range_mrr_icp.result b/mysql-test/main/range_mrr_icp.result
index 5d55a820673..5cda4111b6d 100644
--- a/mysql-test/main/range_mrr_icp.result
+++ b/mysql-test/main/range_mrr_icp.result
@@ -3097,6 +3097,26 @@ a	b
 set eq_range_index_dive_limit=default;
 drop table t1;
 #
+# MDEV-18551: New defaults for eq_range_index_dive_limit
+#
+create table ten(a int);
+insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t1(a int, key(a));
+insert into t1 select A.a + B.a*10 + C.a*100 from ten A, ten B,ten C;
+insert into t1 select 1 from ten A, ten B,ten C;
+create table t2(a int, key(a));
+insert into t2 select A.a + B.a*10 + C.a*100 from ten A, ten B,ten C where A.a + B.a*10 + C.a*100 < 199;
+# expected type=range, rows=1487 , reason=using index dives
+analyze SELECT * FROM t1 where a in (0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	1487	1199.00	100.00	100.00	Using where; Using index
+insert into t2 values (200),(201);
+# expected type=range, rows=201 , reason=using index statistics
+analyze SELECT * FROM t1 where a in (0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,200,201);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	201	1201.00	100.00	100.00	Using where; Using index
+drop table t1,ten,t2;
+#
 # End of 10.2 tests
 #
 set global innodb_stats_persistent= @innodb_stats_persistent_save;
diff --git a/mysql-test/main/range_vs_index_merge.result b/mysql-test/main/range_vs_index_merge.result
index 82d2358cebc..efbf41d6372 100644
--- a/mysql-test/main/range_vs_index_merge.result
+++ b/mysql-test/main/range_vs_index_merge.result
@@ -1079,7 +1079,7 @@ EXPLAIN SELECT Name, Country, Population FROM City WHERE
 (Name='Samara' AND Country='RUS') OR  
 (Name='Seattle' AND Country='USA');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CityName	35	NULL	27	Using index condition; Using where
+1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CountryName	38	NULL	28	Using index condition; Using where
 SELECT Name, Country, Population FROM City WHERE
 (Name='Manila' AND Country='PHL') OR
 (Name='Addis Abeba' AND Country='ETH') OR          
@@ -1109,33 +1109,33 @@ SELECT Name, Country, Population FROM City WHERE
 (Name='Samara' AND Country='RUS') OR  
 (Name='Seattle' AND Country='USA');
 Name	Country	Population
-Addis Abeba	ETH	2495000
-Ankara	TUR	3038159
-Bangalore	IND	2660088
+Toronto	CAN	688275
+Vancouver	CAN	514008
 Basel	CHE	166700
-Caracas	VEN	1975294
-Dakar	SEN	785071
-Delhi	IND	7206704
+Peking	CHN	7472000
+Praha	CZE	1181126
 Dresden	DEU	476668
+Addis Abeba	ETH	2495000
+Paris	FRA	2125246
 Jakarta	IDN	9604900
+Bangalore	IND	2660088
+Delhi	IND	7206704
+Teheran	IRN	6758845
+Roma	ITA	2643581
+Venezia	ITA	277305
+Tokyo	JPN	7980230
+Seoul	KOR	9981619
 Kaunas	LTU	412639
+Rabat	MAR	623457
+Tijuana	MEX	1212232
 Lagos	NGA	1518000
-Lugansk	UKR	469000
 Manila	PHL	1581082
-Paris	FRA	2125246
-Peking	CHN	7472000
-Praha	CZE	1181126
-Rabat	MAR	623457
-Roma	ITA	2643581
 Samara	RUS	1156100
+Dakar	SEN	785071
+Ankara	TUR	3038159
+Lugansk	UKR	469000
 Seattle	USA	563374
-Seoul	KOR	9981619
-Teheran	IRN	6758845
-Tijuana	MEX	1212232
-Tokyo	JPN	7980230
-Toronto	CAN	688275
-Vancouver	CAN	514008
-Venezia	ITA	277305
+Caracas	VEN	1975294
 set optimizer_switch='index_merge=off';
 EXPLAIN SELECT Name, Country, Population FROM City WHERE
 (Name='Manila' AND Country='PHL') OR
@@ -1166,7 +1166,7 @@ EXPLAIN SELECT Name, Country, Population FROM City WHERE
 (Name='Samara' AND Country='RUS') OR  
 (Name='Seattle' AND Country='USA');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CityName	35	NULL	27	Using index condition; Using where
+1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CountryName	38	NULL	28	Using index condition; Using where
 SELECT Name, Country, Population FROM City WHERE
 (Name='Manila' AND Country='PHL') OR
 (Name='Addis Abeba' AND Country='ETH') OR          
@@ -1196,33 +1196,33 @@ SELECT Name, Country, Population FROM City WHERE
 (Name='Samara' AND Country='RUS') OR  
 (Name='Seattle' AND Country='USA');
 Name	Country	Population
-Addis Abeba	ETH	2495000
-Ankara	TUR	3038159
-Bangalore	IND	2660088
+Toronto	CAN	688275
+Vancouver	CAN	514008
 Basel	CHE	166700
-Caracas	VEN	1975294
-Dakar	SEN	785071
-Delhi	IND	7206704
+Peking	CHN	7472000
+Praha	CZE	1181126
 Dresden	DEU	476668
+Addis Abeba	ETH	2495000
+Paris	FRA	2125246
 Jakarta	IDN	9604900
+Bangalore	IND	2660088
+Delhi	IND	7206704
+Teheran	IRN	6758845
+Roma	ITA	2643581
+Venezia	ITA	277305
+Tokyo	JPN	7980230
+Seoul	KOR	9981619
 Kaunas	LTU	412639
+Rabat	MAR	623457
+Tijuana	MEX	1212232
 Lagos	NGA	1518000
-Lugansk	UKR	469000
 Manila	PHL	1581082
-Paris	FRA	2125246
-Peking	CHN	7472000
-Praha	CZE	1181126
-Rabat	MAR	623457
-Roma	ITA	2643581
 Samara	RUS	1156100
+Dakar	SEN	785071
+Ankara	TUR	3038159
+Lugansk	UKR	469000
 Seattle	USA	563374
-Seoul	KOR	9981619
-Teheran	IRN	6758845
-Tijuana	MEX	1212232
-Tokyo	JPN	7980230
-Toronto	CAN	688275
-Vancouver	CAN	514008
-Venezia	ITA	277305
+Caracas	VEN	1975294
 set optimizer_switch=@save_optimizer_switch;
 # 
 # Bug mdev-585: range vs index-merge with ORDER BY ... LIMIT n
@@ -1900,23 +1900,23 @@ Country='NOR' AND Name IN ('Oslo', 'Bergen') OR
 Country='ITA' AND Name IN ('Napoli', 'Venezia');
 ID	Name	Country	Population
 175	Antwerpen	BEL	446525
-2808	Bergen	NOR	230948
+176	Gent	BEL	224180
 3068	Berlin	DEU	3386667
 3087	Bonn	DEU	301048
-2918	Braga	PRT	90535
-176	Gent	BEL	224180
 3242	Lahti	FIN	96921
-3580	Moscow	RUS	8389200
+2974	Paris	FRA	2125246
 1466	Napoli	ITA	1002619
+1474	Venezia	ITA	277305
+2808	Bergen	NOR	230948
 2807	Oslo	NOR	508726
-2974	Paris	FRA	2125246
+2928	Warszawa	POL	1615369
+2931	Wroclaw	POL	636765
+2918	Braga	PRT	90535
 2915	Porto	PRT	273060
+3580	Moscow	RUS	8389200
 3581	St Petersburg	RUS	4694000
 3048	Stockholm	SWE	750348
 3051	Uppsala	SWE	189569
-1474	Venezia	ITA	277305
-2928	Warszawa	POL	1615369
-2931	Wroclaw	POL	636765
 explain select * from City
 where
 Country='FIN' AND Name IN ('Lahti','Imatra') OR
@@ -1930,6 +1930,6 @@ Country='POL' AND Name IN ('Warszawa', 'Wroclaw') OR
 Country='NOR' AND Name IN ('Oslo', 'Bergen') OR
 Country='ITA' AND Name IN ('Napoli', 'Venezia');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	CountryName,Name	Name	35	NULL	20	Using index condition; Using where
+1	SIMPLE	City	range	CountryName,Name	CountryName	38	NULL	20	Using index condition; Using where
 DROP DATABASE world;
 set session optimizer_switch='index_merge_sort_intersection=default';
diff --git a/mysql-test/main/range_vs_index_merge_innodb.result b/mysql-test/main/range_vs_index_merge_innodb.result
index 6b6b77232e2..03b43431fe7 100644
--- a/mysql-test/main/range_vs_index_merge_innodb.result
+++ b/mysql-test/main/range_vs_index_merge_innodb.result
@@ -1085,7 +1085,7 @@ EXPLAIN SELECT Name, Country, Population FROM City WHERE
 (Name='Samara' AND Country='RUS') OR  
 (Name='Seattle' AND Country='USA');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CityName	35	NULL	27	Using index condition; Using where
+1	SIMPLE	City	index_merge	Country,CountryPopulation,CountryName,CityName	CountryName,CityName	38,35	NULL	27	Using sort_union(CountryName,CityName); Using where
 SELECT Name, Country, Population FROM City WHERE
 (Name='Manila' AND Country='PHL') OR
 (Name='Addis Abeba' AND Country='ETH') OR          
@@ -1116,32 +1116,32 @@ SELECT Name, Country, Population FROM City WHERE
 (Name='Seattle' AND Country='USA');
 Name	Country	Population
 Addis Abeba	ETH	2495000
-Ankara	TUR	3038159
-Bangalore	IND	2660088
-Basel	CHE	166700
-Caracas	VEN	1975294
-Dakar	SEN	785071
-Delhi	IND	7206704
-Dresden	DEU	476668
+Manila	PHL	1581082
 Jakarta	IDN	9604900
+Delhi	IND	7206704
+Bangalore	IND	2660088
+Teheran	IRN	6758845
+Roma	ITA	2643581
+Venezia	ITA	277305
+Tokyo	JPN	7980230
+Toronto	CAN	688275
+Vancouver	CAN	514008
+Peking	CHN	7472000
+Seoul	KOR	9981619
 Kaunas	LTU	412639
+Rabat	MAR	623457
+Tijuana	MEX	1212232
 Lagos	NGA	1518000
-Lugansk	UKR	469000
-Manila	PHL	1581082
 Paris	FRA	2125246
-Peking	CHN	7472000
+Dresden	DEU	476668
+Dakar	SEN	785071
+Basel	CHE	166700
 Praha	CZE	1181126
-Rabat	MAR	623457
-Roma	ITA	2643581
+Ankara	TUR	3038159
+Lugansk	UKR	469000
+Caracas	VEN	1975294
 Samara	RUS	1156100
 Seattle	USA	563374
-Seoul	KOR	9981619
-Teheran	IRN	6758845
-Tijuana	MEX	1212232
-Tokyo	JPN	7980230
-Toronto	CAN	688275
-Vancouver	CAN	514008
-Venezia	ITA	277305
 set optimizer_switch='index_merge=off';
 EXPLAIN SELECT Name, Country, Population FROM City WHERE
 (Name='Manila' AND Country='PHL') OR
@@ -1172,7 +1172,7 @@ EXPLAIN SELECT Name, Country, Population FROM City WHERE
 (Name='Samara' AND Country='RUS') OR  
 (Name='Seattle' AND Country='USA');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CityName	35	NULL	27	Using index condition; Using where
+1	SIMPLE	City	range	Country,CountryPopulation,CountryName,CityName	CityName	35	NULL	28	Using index condition; Using where
 SELECT Name, Country, Population FROM City WHERE
 (Name='Manila' AND Country='PHL') OR
 (Name='Addis Abeba' AND Country='ETH') OR          
@@ -1906,23 +1906,23 @@ Country='NOR' AND Name IN ('Oslo', 'Bergen') OR
 Country='ITA' AND Name IN ('Napoli', 'Venezia');
 ID	Name	Country	Population
 175	Antwerpen	BEL	446525
-2808	Bergen	NOR	230948
+176	Gent	BEL	224180
 3068	Berlin	DEU	3386667
 3087	Bonn	DEU	301048
-2918	Braga	PRT	90535
-176	Gent	BEL	224180
 3242	Lahti	FIN	96921
-3580	Moscow	RUS	8389200
+2974	Paris	FRA	2125246
 1466	Napoli	ITA	1002619
+1474	Venezia	ITA	277305
+2808	Bergen	NOR	230948
 2807	Oslo	NOR	508726
-2974	Paris	FRA	2125246
+2928	Warszawa	POL	1615369
+2931	Wroclaw	POL	636765
+2918	Braga	PRT	90535
 2915	Porto	PRT	273060
+3580	Moscow	RUS	8389200
 3581	St Petersburg	RUS	4694000
 3048	Stockholm	SWE	750348
 3051	Uppsala	SWE	189569
-1474	Venezia	ITA	277305
-2928	Warszawa	POL	1615369
-2931	Wroclaw	POL	636765
 explain select * from City
 where
 Country='FIN' AND Name IN ('Lahti','Imatra') OR
@@ -1936,7 +1936,7 @@ Country='POL' AND Name IN ('Warszawa', 'Wroclaw') OR
 Country='NOR' AND Name IN ('Oslo', 'Bergen') OR
 Country='ITA' AND Name IN ('Napoli', 'Venezia');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	CountryName,Name	Name	35	NULL	20	Using index condition; Using where
+1	SIMPLE	City	range	CountryName,Name	CountryName	38	NULL	20	Using index condition; Using where
 DROP DATABASE world;
 set session optimizer_switch='index_merge_sort_intersection=default';
 set global innodb_stats_persistent= @innodb_stats_persistent_save;
diff --git a/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result b/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
index 483d38674ef..c517403f842 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
@@ -881,10 +881,10 @@ ENUM_VALUE_LIST	NULL
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	NULL
 VARIABLE_NAME	EQ_RANGE_INDEX_DIVE_LIMIT
-SESSION_VALUE	10
-GLOBAL_VALUE	10
+SESSION_VALUE	200
+GLOBAL_VALUE	200
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	10
+DEFAULT_VALUE	200
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	INT UNSIGNED
 VARIABLE_COMMENT	The optimizer will use existing index statistics instead of doing index dives for equality ranges if the number of equality ranges for the index is larger than or equal to this number. If set to 0, index dives are always used.
diff --git a/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result b/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
index cd119f98438..6d0eb0f8ef2 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result
@@ -895,10 +895,10 @@ ENUM_VALUE_LIST	NULL
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	NULL
 VARIABLE_NAME	EQ_RANGE_INDEX_DIVE_LIMIT
-SESSION_VALUE	10
-GLOBAL_VALUE	10
+SESSION_VALUE	200
+GLOBAL_VALUE	200
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	10
+DEFAULT_VALUE	200
 VARIABLE_SCOPE	SESSION
 VARIABLE_TYPE	INT UNSIGNED
 VARIABLE_COMMENT	The optimizer will use existing index statistics instead of doing index dives for equality ranges if the number of equality ranges for the index is larger than or equal to this number. If set to 0, index dives are always used.