diff --git a/client/sql_string.cc b/client/sql_string.cc
index 82874a4b2ea..5a922b9361c 100644
--- a/client/sql_string.cc
+++ b/client/sql_string.cc
@@ -122,7 +122,7 @@ bool String::set(double num,uint decimals, CHARSET_INFO *cs)
   str_charset=cs;
   if (decimals >= NOT_FIXED_DEC)
   {
-    uint32 len= my_sprintf(buff,(buff, "%.14g",num));// Enough for a DATETIME
+    uint32 len= my_sprintf(buff,(buff, "%.15g",num));// Enough for a DATETIME
     return copy(buff, len, &my_charset_latin1, cs, &dummy_errors);
   }
 #ifdef HAVE_FCONVERT
@@ -674,7 +674,7 @@ void String::qs_append(const char *str, uint32 len)
 void String::qs_append(double d)
 {
   char *buff = Ptr + str_length;
-  str_length+= my_sprintf(buff, (buff, "%.14g", d));
+  str_length+= my_sprintf(buff, (buff, "%.15g", d));
 }
 
 void String::qs_append(double *d)
diff --git a/libmysql/libmysql.c b/libmysql/libmysql.c
index ca329eadf0f..e84e79fc89e 100644
--- a/libmysql/libmysql.c
+++ b/libmysql/libmysql.c
@@ -3833,13 +3833,13 @@ static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
 #undef NOT_FIXED_DEC
     {
       /*
-        The 14 below is to ensure that the server and client has the same
+        DBL_DIG below is to ensure that the server and client has the same
         precisions. This will ensure that on the same machine you get the
         same value as a string independent of the protocol you use.
       */
       sprintf(buff, "%-*.*g", (int) min(sizeof(buff)-1,
                                         param->buffer_length),
-	      min(14,width), value);
+              min(DBL_DIG, width), value);
       end= strcend(buff, ' ');
       *end= 0;
     }
diff --git a/mysql-test/r/archive_gis.result b/mysql-test/r/archive_gis.result
index 901f8a9acc2..178c5716911 100644
--- a/mysql-test/r/archive_gis.result
+++ b/mysql-test/r/archive_gis.result
@@ -292,7 +292,7 @@ Note	1003	select astext(startpoint(`test`.`gis_line`.`g`)) AS `AsText(StartPoint
 SELECT fid, AsText(Centroid(g)) FROM gis_polygon ORDER by fid;
 fid	AsText(Centroid(g))
 108	POINT(15 15)
-109	POINT(25.416666666667 25.416666666667)
+109	POINT(25.4166666666667 25.4166666666667)
 110	POINT(20 10)
 SELECT fid, Area(g) FROM gis_polygon ORDER by fid;
 fid	Area(g)
@@ -326,8 +326,8 @@ fid	IsClosed(g)
 116	0
 SELECT fid, AsText(Centroid(g)) FROM gis_multi_polygon ORDER by fid;
 fid	AsText(Centroid(g))
-117	POINT(55.588527753042 17.426536064114)
-118	POINT(55.588527753042 17.426536064114)
+117	POINT(55.5885277530424 17.426536064114)
+118	POINT(55.5885277530424 17.426536064114)
 119	POINT(2 2)
 SELECT fid, Area(g) FROM gis_multi_polygon ORDER by fid;
 fid	Area(g)
diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result
index e0a6c44eb01..3d989ad1730 100644
--- a/mysql-test/r/func_group.result
+++ b/mysql-test/r/func_group.result
@@ -61,7 +61,7 @@ grp	sum
 NULL	NULL
 1	7
 2	20.25
-3	45.483163247594
+3	45.4831632475944
 create table t2 (grp int, a bigint unsigned, c char(10));
 insert into t2 select grp,max(a)+max(grp),max(c) from t1 group by grp;
 replace into t2 select grp, a, c from t1 limit 2,1;
@@ -1186,7 +1186,7 @@ std(s1/s2)
 0.21325764
 select std(o1/o2) from bug22555;
 std(o1/o2)
-0.21325763586649
+0.213257635866493
 select std(e1/e2) from bug22555;
 std(e1/e2)
 0.21325764
@@ -1212,7 +1212,7 @@ round(std(s1/s2), 17)
 0.21325763586649341
 select std(o1/o2) from bug22555;
 std(o1/o2)
-0.21325763586649
+0.213257635866493
 select round(std(e1/e2), 17) from bug22555;
 round(std(e1/e2), 17)
 0.21325763586649341
@@ -1237,7 +1237,7 @@ round(std(s1/s2), 17)
 0.21325763586649341
 select std(o1/o2) from bug22555;
 std(o1/o2)
-0.21325763586649
+0.213257635866493
 select round(std(e1/e2), 17) from bug22555;
 round(std(e1/e2), 17)
 0.21325763586649341
diff --git a/mysql-test/r/func_math.result b/mysql-test/r/func_math.result
index b4a07f18521..74136816a95 100644
--- a/mysql-test/r/func_math.result
+++ b/mysql-test/r/func_math.result
@@ -60,7 +60,7 @@ Warnings:
 Note	1003	select ln(exp(10)) AS `ln(exp(10))`,exp((ln(sqrt(10)) * 2)) AS `exp(ln(sqrt(10))*2)`,ln(-(1)) AS `ln(-1)`,ln(0) AS `ln(0)`,ln(NULL) AS `ln(NULL)`
 select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
 log2(8)	log2(15)	log2(-2)	log2(0)	log2(NULL)
-3	3.9068905956085	NULL	NULL	NULL
+3	3.90689059560852	NULL	NULL	NULL
 explain extended select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
@@ -68,7 +68,7 @@ Warnings:
 Note	1003	select log2(8) AS `log2(8)`,log2(15) AS `log2(15)`,log2(-(2)) AS `log2(-2)`,log2(0) AS `log2(0)`,log2(NULL) AS `log2(NULL)`
 select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
 log10(100)	log10(18)	log10(-4)	log10(0)	log10(NULL)
-2	1.2552725051033	NULL	NULL	NULL
+2	1.25527250510331	NULL	NULL	NULL
 explain extended select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
@@ -85,7 +85,7 @@ Note	1003	select pow(10,log10(10)) AS `pow(10,log10(10))`,pow(2,4) AS `power(2,4
 set @@rand_seed1=10000000,@@rand_seed2=1000000;
 select rand(999999),rand();
 rand(999999)	rand()
-0.014231365187309	0.028870999839968
+0.0142313651873091	0.028870999839968
 explain extended select rand(999999),rand();
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
@@ -101,7 +101,7 @@ Warnings:
 Note	1003	select pi() AS `pi()`,format(sin((pi() / 2)),6) AS `format(sin(pi()/2),6)`,format(cos((pi() / 2)),6) AS `format(cos(pi()/2),6)`,format(abs(tan(pi())),6) AS `format(abs(tan(pi())),6)`,format((1 / tan(1)),6) AS `format(cot(1),6)`,format(asin(1),6) AS `format(asin(1),6)`,format(acos(0),6) AS `format(acos(0),6)`,format(atan(1),6) AS `format(atan(1),6)`
 select degrees(pi()),radians(360);
 degrees(pi())	radians(360)
-180	6.2831853071796
+180	6.28318530717959
 select format(atan(-2, 2), 6);
 format(atan(-2, 2), 6)
 -0.785398
@@ -368,7 +368,7 @@ mod(5, cast(-2 as unsigned))	mod(5, 18446744073709551614)	mod(5, -2)
 5	5	1
 select pow(cast(-2 as unsigned), 5), pow(18446744073709551614, 5), pow(-2, 5);
 pow(cast(-2 as unsigned), 5)	pow(18446744073709551614, 5)	pow(-2, 5)
-2.1359870359209e+96	2.1359870359209e+96	-32
+2.13598703592091e+96	2.13598703592091e+96	-32
 CREATE TABLE t1 (a timestamp, b varchar(20), c bit(1));
 INSERT INTO t1 VALUES('1998-09-23', 'str1', 1), ('2003-03-25', 'str2', 0);
 SELECT a DIV 900 y FROM t1 GROUP BY y;
diff --git a/mysql-test/r/func_str.result b/mysql-test/r/func_str.result
index e73d320596d..00c98ad136c 100644
--- a/mysql-test/r/func_str.result
+++ b/mysql-test/r/func_str.result
@@ -1351,10 +1351,10 @@ cast(rtrim(ltrim('  20.06 ')) as decimal(19,2))
 20.06
 select conv("18383815659218730760",10,10) + 0;
 conv("18383815659218730760",10,10) + 0
-1.8383815659219e+19
+1.83838156592187e+19
 select "18383815659218730760" + 0;
 "18383815659218730760" + 0
-1.8383815659219e+19
+1.83838156592187e+19
 CREATE TABLE t1 (code varchar(10));
 INSERT INTO t1 VALUES ('a12'), ('A12'), ('a13');
 SELECT ASCII(code), code FROM t1 WHERE code='A12';
diff --git a/mysql-test/r/gis.result b/mysql-test/r/gis.result
index fdcde4e8739..94a5fd83162 100644
--- a/mysql-test/r/gis.result
+++ b/mysql-test/r/gis.result
@@ -284,7 +284,7 @@ Note	1003	select astext(startpoint(`test`.`gis_line`.`g`)) AS `AsText(StartPoint
 SELECT fid, AsText(Centroid(g)) FROM gis_polygon;
 fid	AsText(Centroid(g))
 108	POINT(15 15)
-109	POINT(25.416666666667 25.416666666667)
+109	POINT(25.4166666666667 25.4166666666667)
 110	POINT(20 10)
 SELECT fid, Area(g) FROM gis_polygon;
 fid	Area(g)
@@ -318,8 +318,8 @@ fid	IsClosed(g)
 116	0
 SELECT fid, AsText(Centroid(g)) FROM gis_multi_polygon;
 fid	AsText(Centroid(g))
-117	POINT(55.588527753042 17.426536064114)
-118	POINT(55.588527753042 17.426536064114)
+117	POINT(55.5885277530424 17.426536064114)
+118	POINT(55.5885277530424 17.426536064114)
 119	POINT(2 2)
 SELECT fid, Area(g) FROM gis_multi_polygon;
 fid	Area(g)
@@ -651,11 +651,11 @@ insert into t1 values ('85984',GeomFromText('MULTIPOLYGON(((-115.006363
 select object_id, geometrytype(geo), ISSIMPLE(GEO), ASTEXT(centroid(geo)) from
 t1 where object_id=85998;
 object_id	geometrytype(geo)	ISSIMPLE(GEO)	ASTEXT(centroid(geo))
-85998	MULTIPOLYGON	0	POINT(115.31877315203 -36.237472821022)
+85998	MULTIPOLYGON	0	POINT(115.318773152032 -36.2374728210215)
 select object_id, geometrytype(geo), ISSIMPLE(GEO), ASTEXT(centroid(geo)) from
 t1 where object_id=85984;
 object_id	geometrytype(geo)	ISSIMPLE(GEO)	ASTEXT(centroid(geo))
-85984	MULTIPOLYGON	0	POINT(-114.87787186923 36.33101763469)
+85984	MULTIPOLYGON	0	POINT(-114.877871869233 36.3310176346905)
 drop table t1;
 create table t1 (fl geometry not null);
 insert into t1 values (1);
diff --git a/mysql-test/r/innodb_gis.result b/mysql-test/r/innodb_gis.result
index ef8bdcc5f3e..c6c775afc9f 100644
--- a/mysql-test/r/innodb_gis.result
+++ b/mysql-test/r/innodb_gis.result
@@ -292,7 +292,7 @@ Note	1003	select astext(startpoint(`test`.`gis_line`.`g`)) AS `AsText(StartPoint
 SELECT fid, AsText(Centroid(g)) FROM gis_polygon ORDER by fid;
 fid	AsText(Centroid(g))
 108	POINT(15 15)
-109	POINT(25.416666666667 25.416666666667)
+109	POINT(25.4166666666667 25.4166666666667)
 110	POINT(20 10)
 SELECT fid, Area(g) FROM gis_polygon ORDER by fid;
 fid	Area(g)
@@ -326,8 +326,8 @@ fid	IsClosed(g)
 116	0
 SELECT fid, AsText(Centroid(g)) FROM gis_multi_polygon ORDER by fid;
 fid	AsText(Centroid(g))
-117	POINT(55.588527753042 17.426536064114)
-118	POINT(55.588527753042 17.426536064114)
+117	POINT(55.5885277530424 17.426536064114)
+118	POINT(55.5885277530424 17.426536064114)
 119	POINT(2 2)
 SELECT fid, Area(g) FROM gis_multi_polygon ORDER by fid;
 fid	Area(g)
diff --git a/mysql-test/r/parser.result b/mysql-test/r/parser.result
index 270c1ec5670..002fbd02c2a 100644
--- a/mysql-test/r/parser.result
+++ b/mysql-test/r/parser.result
@@ -522,7 +522,7 @@ select conv(255 AS p1, 10 AS p2, 16 AS p3);
 ERROR 42000: Incorrect parameters in the call to native function 'conv'
 select atan(10);
 atan(10)
-1.4711276743037
+1.47112767430373
 select atan(10 AS p1);
 ERROR 42000: Incorrect parameters in the call to native function 'atan'
 select atan(10 p1);
@@ -533,7 +533,7 @@ select atan(10 "p1");
 ERROR 42000: Incorrect parameters in the call to native function 'atan'
 select atan(10, 20);
 atan(10, 20)
-0.46364760900081
+0.463647609000806
 select atan(10 AS p1, 20);
 ERROR 42000: Incorrect parameters in the call to native function 'atan'
 select atan(10 p1, 20);
diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index 0519489b715..621c11906cb 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -2784,26 +2784,26 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
 select max(key1) from t1 where key1 <= 0.6158;
 max(key1)
-0.61580002307892
+0.615800023078918
 select max(key2) from t2 where key2 <= 1.6158;
 max(key2)
-1.6158000230789
+1.61580002307892
 select min(key1) from t1 where key1 >= 0.3762;
 min(key1)
-0.37619999051094
+0.376199990510941
 select min(key2) from t2 where key2 >= 1.3762;
 min(key2)
-1.3761999607086
+1.37619996070862
 select max(key1), min(key2) from t1, t2
 where key1 <= 0.6158 and key2 >= 1.3762;
 max(key1)	min(key2)
-0.61580002307892	1.3761999607086
+0.615800023078918	1.37619996070862
 select max(key1) from t1 where key1 <= 0.6158 and rand() + 0.5 >= 0.5;
 max(key1)
-0.61580002307892
+0.615800023078918
 select min(key1) from t1 where key1 >= 0.3762 and rand() + 0.5 >= 0.5;
 min(key1)
-0.37619999051094
+0.376199990510941
 DROP TABLE t1,t2;
 CREATE TABLE t1 (i BIGINT UNSIGNED NOT NULL);
 INSERT INTO t1 VALUES (10);
diff --git a/mysql-test/r/sp.result b/mysql-test/r/sp.result
index 01ddde56450..cf4eac563ad 100644
--- a/mysql-test/r/sp.result
+++ b/mysql-test/r/sp.result
@@ -581,7 +581,7 @@ return 2.7182818284590452354|
 set @e = e()|
 select e(), @e|
 e()	@e
-2.718281828459	2.718281828459
+2.71828182845905	2.71828182845905
 drop function if exists inc|
 create function inc(i int) returns int
 return i+1|
@@ -618,7 +618,7 @@ create function fun(d double, i int, u int unsigned) returns double
 return mul(inc(i), fac(u)) / e()|
 select fun(2.3, 3, 5)|
 fun(2.3, 3, 5)
-176.58213176229
+176.582131762292
 insert into t2 values (append("xxx", "yyy"), mul(4,3), e())|
 insert into t2 values (append("a", "b"), mul(2,mul(3,4)), fun(1.7, 4, 6))|
 select * from t2 where s = append("a", "b")|
@@ -6018,9 +6018,9 @@ CREATE TABLE t3 (f1 INT, f2 FLOAT)|
 INSERT INTO t3 VALUES (1, 3.4), (1, 2), (1, 0.9), (2, 8), (2, 7)|
 SELECT SUM(f2), bug25373(f1) FROM t3 GROUP BY bug25373(f1) WITH ROLLUP|
 SUM(f2)	bug25373(f1)
-6.3000000715256	1
+6.30000007152557	1
 15	2
-21.300000071526	NULL
+21.3000000715256	NULL
 DROP FUNCTION bug25373|
 DROP TABLE t3|
 DROP DATABASE IF EXISTS mysqltest1|
diff --git a/mysql-test/r/type_float.result b/mysql-test/r/type_float.result
index d4cfd1c04ed..a3a13bb0435 100644
--- a/mysql-test/r/type_float.result
+++ b/mysql-test/r/type_float.result
@@ -385,12 +385,12 @@ Warning	1264	Out of range value for column 'f1' at row 1
 Warning	1264	Out of range value for column 'f1' at row 2
 select f1 + 0e0 from t1;
 f1 + 0e0
-1.0000000150475e+29
--1.0000000150475e+29
-1.0000000150475e+30
--1.0000000150475e+30
-1.0000000150475e+30
--1.0000000150475e+30
+1.00000001504747e+29
+-1.00000001504747e+29
+1.00000001504747e+30
+-1.00000001504747e+30
+1.00000001504747e+30
+-1.00000001504747e+30
 drop table t1;
 create table t1(d double, u bigint unsigned);
 insert into t1(d) values (9.22337203685479e18),
@@ -401,4 +401,10 @@ u
 9223372036854790144
 18400000000000000000
 drop table t1;
+CREATE TABLE t1 (f1 DOUBLE);
+INSERT INTO t1 VALUES(-1.79769313486231e+308);
+SELECT f1 FROM t1;
+f1
+-1.79769313486231e+308
+DROP TABLE t1;
 End of 5.0 tests
diff --git a/mysql-test/suite/funcs_1/r/memory_func_view.result b/mysql-test/suite/funcs_1/r/memory_func_view.result
index 9a2b0a6a293..4e48d9412d1 100644
--- a/mysql-test/suite/funcs_1/r/memory_func_view.result
+++ b/mysql-test/suite/funcs_1/r/memory_func_view.result
@@ -5246,7 +5246,7 @@ WHERE select_id = 1 OR select_id IS NULL order by id;
 sqrt(my_bigint)	my_bigint	id
 NULL	NULL	1
 NULL	-9223372036854775808	2
-3037000499.976	9223372036854775807	3
+3037000499.97605	9223372036854775807	3
 0	0	4
 NULL	-1	5
 2	4	6
@@ -5260,7 +5260,7 @@ WHERE select_id = 1 OR select_id IS NULL) order by id;
 sqrt(my_bigint)	my_bigint	id
 NULL	NULL	1
 NULL	-9223372036854775808	2
-3037000499.976	9223372036854775807	3
+3037000499.97605	9223372036854775807	3
 0	0	4
 NULL	-1	5
 2	4	6
diff --git a/mysql-test/suite/funcs_1/r/memory_views.result b/mysql-test/suite/funcs_1/r/memory_views.result
index 2eba325db23..856a8c5a893 100644
--- a/mysql-test/suite/funcs_1/r/memory_views.result
+++ b/mysql-test/suite/funcs_1/r/memory_views.result
@@ -22826,7 +22826,7 @@ f1	f2
 ABC	3
 SELECT * FROM v1 order by 2;
 f1	my_sqrt
-ABC	1.7320508075689
+ABC	1.73205080756888
 ALTER TABLE t1 CHANGE COLUMN f2 f2 VARCHAR(30);
 INSERT INTO t1   SET f1 = 'ABC', f2 = 'DEF';
 DESCRIBE t1;
@@ -22844,7 +22844,7 @@ ABC	DEF
 SELECT * FROM v1 order by 2;
 f1	my_sqrt
 ABC	0
-ABC	1.7320508075689
+ABC	1.73205080756888
 SELECT SQRT('DEF');
 SQRT('DEF')
 0
@@ -22864,7 +22864,7 @@ my_sqrt	double	YES		NULL
 SELECT * FROM v2 order by 2;
 f1	my_sqrt
 ABC	0
-ABC	1.7320508075689
+ABC	1.73205080756888
 CREATE TABLE t2 AS SELECT f1, SQRT(f2) my_sqrt FROM t1;
 SELECT * FROM t2 order by 2;
 f1	ABC
diff --git a/mysql-test/suite/funcs_1/r/myisam_func_view.result b/mysql-test/suite/funcs_1/r/myisam_func_view.result
index 9a2b0a6a293..4e48d9412d1 100644
--- a/mysql-test/suite/funcs_1/r/myisam_func_view.result
+++ b/mysql-test/suite/funcs_1/r/myisam_func_view.result
@@ -5246,7 +5246,7 @@ WHERE select_id = 1 OR select_id IS NULL order by id;
 sqrt(my_bigint)	my_bigint	id
 NULL	NULL	1
 NULL	-9223372036854775808	2
-3037000499.976	9223372036854775807	3
+3037000499.97605	9223372036854775807	3
 0	0	4
 NULL	-1	5
 2	4	6
@@ -5260,7 +5260,7 @@ WHERE select_id = 1 OR select_id IS NULL) order by id;
 sqrt(my_bigint)	my_bigint	id
 NULL	NULL	1
 NULL	-9223372036854775808	2
-3037000499.976	9223372036854775807	3
+3037000499.97605	9223372036854775807	3
 0	0	4
 NULL	-1	5
 2	4	6
diff --git a/mysql-test/suite/funcs_1/r/myisam_views.result b/mysql-test/suite/funcs_1/r/myisam_views.result
index 3fcd8113df5..3884657c925 100644
--- a/mysql-test/suite/funcs_1/r/myisam_views.result
+++ b/mysql-test/suite/funcs_1/r/myisam_views.result
@@ -24528,7 +24528,7 @@ f1	f2
 ABC	3
 SELECT * FROM v1 order by 2;
 f1	my_sqrt
-ABC	1.7320508075689
+ABC	1.73205080756888
 ALTER TABLE t1 CHANGE COLUMN f2 f2 VARCHAR(30);
 INSERT INTO t1   SET f1 = 'ABC', f2 = 'DEF';
 DESCRIBE t1;
@@ -24546,7 +24546,7 @@ ABC	DEF
 SELECT * FROM v1 order by 2;
 f1	my_sqrt
 ABC	0
-ABC	1.7320508075689
+ABC	1.73205080756888
 SELECT SQRT('DEF');
 SQRT('DEF')
 0
@@ -24566,7 +24566,7 @@ my_sqrt	double	YES		NULL
 SELECT * FROM v2 order by 2;
 f1	my_sqrt
 ABC	0
-ABC	1.7320508075689
+ABC	1.73205080756888
 CREATE TABLE t2 AS SELECT f1, SQRT(f2) my_sqrt FROM t1;
 SELECT * FROM t2 order by 2;
 f1	ABC
diff --git a/mysql-test/suite/ndb/r/ndb_gis.result b/mysql-test/suite/ndb/r/ndb_gis.result
index 6c44c6fb822..374d702c408 100644
--- a/mysql-test/suite/ndb/r/ndb_gis.result
+++ b/mysql-test/suite/ndb/r/ndb_gis.result
@@ -292,7 +292,7 @@ Note	1003	select astext(startpoint(`test`.`gis_line`.`g`)) AS `AsText(StartPoint
 SELECT fid, AsText(Centroid(g)) FROM gis_polygon ORDER by fid;
 fid	AsText(Centroid(g))
 108	POINT(15 15)
-109	POINT(25.416666666667 25.416666666667)
+109	POINT(25.4166666666667 25.4166666666667)
 110	POINT(20 10)
 SELECT fid, Area(g) FROM gis_polygon ORDER by fid;
 fid	Area(g)
@@ -326,8 +326,8 @@ fid	IsClosed(g)
 116	0
 SELECT fid, AsText(Centroid(g)) FROM gis_multi_polygon ORDER by fid;
 fid	AsText(Centroid(g))
-117	POINT(55.588527753042 17.426536064114)
-118	POINT(55.588527753042 17.426536064114)
+117	POINT(55.5885277530424 17.426536064114)
+118	POINT(55.5885277530424 17.426536064114)
 119	POINT(2 2)
 SELECT fid, Area(g) FROM gis_multi_polygon ORDER by fid;
 fid	Area(g)
@@ -842,7 +842,7 @@ Note	1003	select astext(startpoint(`test`.`gis_line`.`g`)) AS `AsText(StartPoint
 SELECT fid, AsText(Centroid(g)) FROM gis_polygon ORDER by fid;
 fid	AsText(Centroid(g))
 108	POINT(15 15)
-109	POINT(25.416666666667 25.416666666667)
+109	POINT(25.4166666666667 25.4166666666667)
 110	POINT(20 10)
 SELECT fid, Area(g) FROM gis_polygon ORDER by fid;
 fid	Area(g)
@@ -876,8 +876,8 @@ fid	IsClosed(g)
 116	0
 SELECT fid, AsText(Centroid(g)) FROM gis_multi_polygon ORDER by fid;
 fid	AsText(Centroid(g))
-117	POINT(55.588527753042 17.426536064114)
-118	POINT(55.588527753042 17.426536064114)
+117	POINT(55.5885277530424 17.426536064114)
+118	POINT(55.5885277530424 17.426536064114)
 119	POINT(2 2)
 SELECT fid, Area(g) FROM gis_multi_polygon ORDER by fid;
 fid	Area(g)
diff --git a/mysql-test/t/type_float.test b/mysql-test/t/type_float.test
index 53bcf44061d..3b7b30db6f8 100644
--- a/mysql-test/t/type_float.test
+++ b/mysql-test/t/type_float.test
@@ -267,4 +267,13 @@ select u from t1;
 
 drop table t1;
 
+#
+# Bug #21205: Different number of digits for float/doble/real in --ps-protocol
+#
+
+CREATE TABLE t1 (f1 DOUBLE);
+INSERT INTO t1 VALUES(-1.79769313486231e+308);
+SELECT f1 FROM t1;
+DROP TABLE t1;
+
 --echo End of 5.0 tests
diff --git a/sql/handler.cc b/sql/handler.cc
index 948cb08b13f..853ab29d38a 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -429,14 +429,11 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
                                 MYF(MY_WME | MY_ZEROFILL));
   /* Historical Requirement */
   plugin->data= hton; // shortcut for the future
-  if (plugin->plugin->init)
+  if (plugin->plugin->init && plugin->plugin->init(hton))
   {
-    if (plugin->plugin->init(hton))
-    {
-      sql_print_error("Plugin '%s' init function returned error.",
-                      plugin->name.str);
-      goto err;
-    }
+    sql_print_error("Plugin '%s' init function returned error.",
+                    plugin->name.str);
+    goto err;  
   }
 
   /*
@@ -463,17 +460,13 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
         if (idx == (int) DB_TYPE_DEFAULT)
         {
           sql_print_warning("Too many storage engines!");
-          DBUG_RETURN(1);
+          goto err_deinit;
         }
         if (hton->db_type != DB_TYPE_UNKNOWN)
           sql_print_warning("Storage engine '%s' has conflicting typecode. "
                             "Assigning value %d.", plugin->plugin->name, idx);
         hton->db_type= (enum legacy_db_type) idx;
       }
-      installed_htons[hton->db_type]= hton;
-      tmp= hton->savepoint_offset;
-      hton->savepoint_offset= savepoint_alloc_size;
-      savepoint_alloc_size+= tmp;
 
       /*
         In case a plugin is uninstalled and re-installed later, it should
@@ -494,11 +487,14 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
         {
           sql_print_error("Too many plugins loaded. Limit is %lu. "
                           "Failed on '%s'", (ulong) MAX_HA, plugin->name.str);
-          goto err;
+          goto err_deinit;
         }
         hton->slot= total_ha++;
       }
-
+      installed_htons[hton->db_type]= hton;
+      tmp= hton->savepoint_offset;
+      hton->savepoint_offset= savepoint_alloc_size;
+      savepoint_alloc_size+= tmp;
       hton2plugin[hton->slot]=plugin;
       if (hton->prepare)
         total_ha_2pc++;
@@ -530,7 +526,18 @@ int ha_initialize_handlerton(st_plugin_int *plugin)
   };
 
   DBUG_RETURN(0);
+
+err_deinit:
+  /* 
+    Let plugin do its inner deinitialization as plugin->init() 
+    was successfully called before.
+  */
+  if (plugin->plugin->deinit)
+    (void) plugin->plugin->deinit(NULL);
+          
 err:
+  my_free((uchar*) hton, MYF(0));
+  plugin->data= NULL;
   DBUG_RETURN(1);
 }
 
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index 015128cda1f..3fba9248940 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -282,16 +282,12 @@ protected:
 */
 #define TABLE_DEF_CACHE_MIN     256
 
-/* 
- Value of 9236 discovered through binary search 2006-09-26 on Ubuntu Dapper
- Drake, libc6 2.3.6-0ubuntu2, Linux kernel 2.6.15-27-686, on x86.  (Added 
- 100 bytes as reasonable buffer against growth and other environments'
- requirements.)
-
- Feel free to raise this by the smallest amount you can to get the
- "execution_constants" test to pass.
- */
-#define STACK_MIN_SIZE          12000   ///< Abort if less stack during eval.
+/*
+  Stack reservation.
+  Feel free to raise this by the smallest amount you can to get the
+  "execution_constants" test to pass.
+*/
+#define STACK_MIN_SIZE          16000   // Abort if less stack during eval.
 
 #define STACK_MIN_SIZE_FOR_OPEN 1024*80
 #define STACK_BUFF_ALLOC        352     ///< For stack overrun checks
diff --git a/sql/sql_string.cc b/sql/sql_string.cc
index 3098e8ed044..d661505d1a9 100644
--- a/sql/sql_string.cc
+++ b/sql/sql_string.cc
@@ -112,7 +112,7 @@ bool String::set_real(double num,uint decimals, CHARSET_INFO *cs)
   str_charset=cs;
   if (decimals >= NOT_FIXED_DEC)
   {
-    uint32 len= my_sprintf(buff,(buff, "%.14g",num));// Enough for a DATETIME
+    uint32 len= my_sprintf(buff,(buff, "%.15g",num));// Enough for a DATETIME
     return copy(buff, len, &my_charset_latin1, cs, &dummy_errors);
   }
 #ifdef HAVE_FCONVERT
@@ -664,7 +664,7 @@ void String::qs_append(const char *str, uint32 len)
 void String::qs_append(double d)
 {
   char *buff = Ptr + str_length;
-  str_length+= my_sprintf(buff, (buff, "%.14g", d));
+  str_length+= my_sprintf(buff, (buff, "%.15g", d));
 }
 
 void String::qs_append(double *d)