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Backport of WL #2934: Make/find library for doing float/double
to string conversions and vice versa" Initial import of the dtoa.c code and custom wrappers around it to allow its usage from the server code. Conversion of FLOAT/DOUBLE values to DECIMAL ones or strings and vice versa has been significantly reworked. As the new algoritms are more precise than the older ones, results of such conversions may not always match those obtained from older server versions. This in turn may break compatibility for some applications. This patch also fixes the following bugs: - bug #12860 "Difference in zero padding of exponent between Unix and Windows" - bug #21497 "DOUBLE truncated to unusable value" - bug #26788 "mysqld (debug) aborts when inserting specific numbers into char fields" - bug #24541 "Data truncated..." on decimal type columns without any good reason"
This commit is contained in:
Alexey Kopytov
@ -44,7 +44,7 @@ Warnings:
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Note 1003 select abs(-(10)) AS `abs(-10)`,sign(-(5)) AS `sign(-5)`,sign(5) AS `sign(5)`,sign(0) AS `sign(0)`
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select log(exp(10)),exp(log(sqrt(10))*2),log(-1),log(NULL),log(1,1),log(3,9),log(-1,2),log(NULL,2);
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log(exp(10)) exp(log(sqrt(10))*2) log(-1) log(NULL) log(1,1) log(3,9) log(-1,2) log(NULL,2)
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10 10 NULL NULL NULL 2 NULL NULL
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10 10.000000000000002 NULL NULL NULL 2 NULL NULL
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explain extended select log(exp(10)),exp(log(sqrt(10))*2),log(-1),log(NULL),log(1,1),log(3,9),log(-1,2),log(NULL,2);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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@ -52,7 +52,7 @@ Warnings:
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Note 1003 select log(exp(10)) AS `log(exp(10))`,exp((log(sqrt(10)) * 2)) AS `exp(log(sqrt(10))*2)`,log(-(1)) AS `log(-1)`,log(NULL) AS `log(NULL)`,log(1,1) AS `log(1,1)`,log(3,9) AS `log(3,9)`,log(-(1),2) AS `log(-1,2)`,log(NULL,2) AS `log(NULL,2)`
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select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
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ln(exp(10)) exp(ln(sqrt(10))*2) ln(-1) ln(0) ln(NULL)
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10 10 NULL NULL NULL
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10 10.000000000000002 NULL NULL NULL
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explain extended select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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@ -60,7 +60,7 @@ Warnings:
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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)`
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select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
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log2(8) log2(15) log2(-2) log2(0) log2(NULL)
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3 3.90689059560852 NULL NULL NULL
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3 3.9068905956085187 NULL NULL NULL
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explain extended select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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@ -68,7 +68,7 @@ Warnings:
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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)`
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select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
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log10(100) log10(18) log10(-4) log10(0) log10(NULL)
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2 1.25527250510331 NULL NULL NULL
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2 1.255272505103306 NULL NULL NULL
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explain extended select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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@ -85,7 +85,7 @@ Note 1003 select pow(10,log10(10)) AS `pow(10,log10(10))`,pow(2,4) AS `power(2,4
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set @@rand_seed1=10000000,@@rand_seed2=1000000;
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select rand(999999),rand();
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rand(999999) rand()
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0.0142313651873091 0.028870999839968
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0.014231365187309091 0.028870999839968048
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explain extended select rand(999999),rand();
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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@ -101,7 +101,7 @@ Warnings:
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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)`
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select degrees(pi()),radians(360);
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degrees(pi()) radians(360)
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180 6.28318530717959
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180 6.283185307179586
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select format(atan(-2, 2), 6);
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format(atan(-2, 2), 6)
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-0.785398
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@ -119,7 +119,7 @@ ACOS(1.0)
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0
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SELECT ASIN(1.0);
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ASIN(1.0)
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1.5707963267949
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1.5707963267948966
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SELECT ACOS(0.2*5.0);
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ACOS(0.2*5.0)
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0
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@ -128,10 +128,10 @@ ACOS(0.5*2.0)
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0
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SELECT ASIN(0.8+0.2);
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ASIN(0.8+0.2)
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1.5707963267949
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1.5707963267948966
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SELECT ASIN(1.2-0.2);
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ASIN(1.2-0.2)
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1.5707963267949
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1.5707963267948966
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select format(4.55, 1), format(4.551, 1);
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format(4.55, 1) format(4.551, 1)
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4.6 4.6
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@ -368,7 +368,7 @@ mod(5, cast(-2 as unsigned)) mod(5, 18446744073709551614) mod(5, -2)
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5 5 1
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select pow(cast(-2 as unsigned), 5), pow(18446744073709551614, 5), pow(-2, 5);
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pow(cast(-2 as unsigned), 5) pow(18446744073709551614, 5) pow(-2, 5)
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2.13598703592091e+96 2.13598703592091e+96 -32
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2.13598703592091e96 2.13598703592091e96 -32
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CREATE TABLE t1 (a timestamp, b varchar(20), c bit(1));
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INSERT INTO t1 VALUES('1998-09-23', 'str1', 1), ('2003-03-25', 'str2', 0);
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SELECT a DIV 900 y FROM t1 GROUP BY y;
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@ -437,10 +437,10 @@ a ROUND(a)
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2.5 2
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-2.9 -3
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2.9 3
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-1e+16 -10000000000000000
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1e+16 10000000000000000
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-1e+16 -10000000000000002
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1e+16 10000000000000002
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-1e16 -10000000000000000
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1e16 10000000000000000
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-1.0000000000000002e16 -10000000000000002
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1.0000000000000002e16 10000000000000002
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DROP TABLE t1;
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CREATE TABLE t1(f1 LONGTEXT) engine=myisam;
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INSERT INTO t1 VALUES ('a');
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@ -475,16 +475,16 @@ NULL
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CREATE OR REPLACE VIEW v1 AS SELECT NULL AS a;
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SELECT RAND(a) FROM v1;
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RAND(a)
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0.155220427694936
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0.15522042769493574
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DROP VIEW v1;
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SELECT RAND(a) FROM (SELECT NULL AS a) b;
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RAND(a)
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0.155220427694936
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0.15522042769493574
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CREATE TABLE t1 (i INT);
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INSERT INTO t1 VALUES (NULL);
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SELECT RAND(i) FROM t1;
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RAND(i)
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0.155220427694936
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0.15522042769493574
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DROP TABLE t1;
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#
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select 123456789012345678901234567890.123456789012345678901234567890 div 1 as x;
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