One more resolving because of pending log functions changes. Not sure if the manual is merged correctly again. Will ask arjen to check as soon as LOG changes will be pushed

sql/item_func.h:
  Auto merged
sql/lex.h:
  Auto merged
sql/sql_yacc.yy:
  Auto merged

BitKeeper/etc/logging_ok

@@ -45,7 +45,10 @@ nick@nick.leippe.com
 paul@central.snake.net
 paul@teton.kitebird.com
 peter@linux.local
+peter@mysql.com
 root@x3.internalnet
+salle@geopard.(none)
+salle@geopard.online.bg
 sasha@mysql.sashanet.com
 serg@serg.mysql.com
 serg@sergbook.mysql.com
@@ -64,10 +67,8 @@ tonu@volk.internalnet
 tonu@x153.internalnet
 tonu@x3.internalnet
 venu@work.mysql.com
+walrus@mysql.com
 worm@altair.is.lan
 zak@balfor.local
 zak@linux.local
-salle@geopard.(none)
-walrus@mysql.com
 zgreant@mysql.com
-salle@geopard.online.bg

mysql-test/r/func_math.result

@@ -16,9 +16,18 @@ round(5.64,1)	round(5.64,2)	round(5.64,-1)	round(5.64,-2)
 select abs(-10), sign(-5), sign(5), sign(0);
 abs(-10)	sign(-5)	sign(5)	sign(0)
 10	-1	1	0
-select log(exp(10)),exp(log(sqrt(10))*2);
+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);
-log(exp(10))	exp(log(sqrt(10))*2)
+log(exp(10))	exp(log(sqrt(10))*2)	log(-1)	log(NULL)	log(1,1)	log(3,9)	log(-1,2)	log(NULL,2)
-10.000000	10.000000
+10.000000	10.000000	NULL	NULL	NULL	2.000000	NULL	NULL
+select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
+ln(exp(10))	exp(ln(sqrt(10))*2)	ln(-1)	ln(0)	ln(NULL)
+10.000000	10.000000	NULL	NULL	NULL
+select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
+log2(8)	log2(15)	log2(-2)	log2(0)	log2(NULL)
+3.000000	3.906891	NULL	NULL	NULL
+select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
+log10(100)	log10(18)	log10(-4)	log10(0)	log10(NULL)
+2.000000	1.255273	NULL	NULL	NULL
 select pow(10,log10(10)),power(2,4);
 pow(10,log10(10))	power(2,4)
 10.000000	16.000000

mysql-test/t/func_math.test

@@ -8,7 +8,10 @@ select truncate(52.64,1),truncate(52.64,2),truncate(52.64,-1),truncate(52.64,-2)
 select round(5.5),round(-5.5);
 select round(5.64,1),round(5.64,2),round(5.64,-1),round(5.64,-2);
 select abs(-10), sign(-5), sign(5), sign(0);
-select log(exp(10)),exp(log(sqrt(10))*2);
+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);
+select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
+select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
+select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
 select pow(10,log10(10)),power(2,4);
 select rand(999999),rand();
 select pi(),sin(pi()/2),cos(pi()/2),abs(tan(pi())),cot(1),asin(1),acos(0),atan(1);

sql/gen_lex_hash.cc

@@ -74,13 +74,13 @@ static struct my_option my_long_options[] =
   {"version", 'V', "Output version information and exit",
    0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
   {"rnd1", 'r', "Set 1 part of rnd value for hash generator",
-   (gptr*) &best_t1, (gptr*) &best_t1, 0, GET_ULONG, REQUIRED_ARG, 6657025L,
+   (gptr*) &best_t1, (gptr*) &best_t1, 0, GET_ULONG, REQUIRED_ARG, 5075635L,
    0, 0, 0, 0, 0},
   {"rnd2", 'R', "Set 2 part of rnd value for hash generator",
-   (gptr*) &best_t2, (gptr*) &best_t2, 0, GET_ULONG, REQUIRED_ARG, 6114496L,
+   (gptr*) &best_t2, (gptr*) &best_t2, 0, GET_ULONG, REQUIRED_ARG, 1345933L,
    0, 0, 0, 0, 0},
   {"type", 't', "Set type of char table to generate",
-   (gptr*) &best_type, (gptr*) &best_type, 0, GET_UINT, REQUIRED_ARG, 1, 0, 0,
+   (gptr*) &best_type, (gptr*) &best_type, 0, GET_UINT, REQUIRED_ARG, 4, 0, 0,
    0, 0, 0},
   { 0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
 };
@@ -479,7 +479,7 @@ int main(int argc,char **argv)
 
   MY_INIT(argv[0]);
 
-  start_value=1109118L;   /* mode=4903  add=3  type: 0 */
+  start_value=3807640L;   /* mode=6971  add=3  type: 0 */
   if (get_options(argc,(char **) argv))
     exit(1);
 

sql/item_create.cc

@@ -220,9 +220,14 @@ Item *create_func_char_length(Item* a)
   return new Item_func_char_length(a);
 }
 
-Item *create_func_log(Item* a)
+Item *create_func_ln(Item* a)
 {
-  return new Item_func_log(a);
+  return new Item_func_ln(a);
+}
+
+Item *create_func_log2(Item* a)
+{
+  return new Item_func_log2(a);
 }
 
 Item *create_func_log10(Item* a)

sql/item_create.h

@@ -52,8 +52,9 @@ Item *create_func_instr(Item* a, Item *b);
 Item *create_func_isnull(Item* a);
 Item *create_func_lcase(Item* a);
 Item *create_func_length(Item* a);
+Item *create_func_ln(Item* a);
 Item *create_func_locate(Item* a, Item *b);
-Item *create_func_log(Item* a);
+Item *create_func_log2(Item* a);
 Item *create_func_log10(Item* a);
 Item *create_func_lpad(Item* a, Item *b, Item *c);
 Item *create_func_ltrim(Item* a);

sql/item_func.cc

@@ -437,14 +437,43 @@ void Item_func_abs::fix_length_and_dec()
   hybrid_type= args[0]->result_type() == INT_RESULT ? INT_RESULT : REAL_RESULT;
 }
 
+/* Gateway to natural LOG function */
+double Item_func_ln::val()
+{
+  double value=args[0]->val();
+  if ((null_value=(args[0]->null_value || value <= 0.0)))
+    return 0.0;
+  return log(value);
+}
+
+/* 
+ Extended but so slower LOG function
+ We have to check if all values are > zero and first one is not one
+ as these are the cases then result is not a number.
+*/ 
 double Item_func_log::val()
 {
   double value=args[0]->val();
   if ((null_value=(args[0]->null_value || value <= 0.0)))
-    return 0.0; /* purecov: inspected */
+    return 0.0;
+  if (arg_count == 2)
+  {
+    double value2= args[1]->val();
+    if ((null_value=(args[1]->null_value || value2 <= 0.0 || value == 1.0)))
+      return 0.0;
+    return log(value2) / log(value);
+  }
   return log(value);
 }
 
+double Item_func_log2::val()
+{
+  double value=args[0]->val();
+  if ((null_value=(args[0]->null_value || value <= 0.0)))
+    return 0.0;
+  return log(value) / log(2.0);
+}
+
 double Item_func_log10::val()
 {
   double value=args[0]->val();

sql/item_func.h

@@ -342,15 +342,35 @@ public:
   const char *func_name() const { return "exp"; }
 };
 
+
+class Item_func_ln :public Item_dec_func
+{
+public:
+  Item_func_ln(Item *a) :Item_dec_func(a) {}
+  double val();
+  const char *func_name() const { return "ln"; }
+};
+
+
 class Item_func_log :public Item_dec_func
 {
 public:
   Item_func_log(Item *a) :Item_dec_func(a) {}
+  Item_func_log(Item *a,Item *b) :Item_dec_func(a,b) {}
   double val();
   const char *func_name() const { return "log"; }
 };
 
 
+class Item_func_log2 :public Item_dec_func
+{
+public:
+  Item_func_log2(Item *a) :Item_dec_func(a) {}
+  double val();
+  const char *func_name() const { return "log2"; }
+};
+
+
 class Item_func_log10 :public Item_dec_func
 {
 public:

sql/lex.h

@@ -463,9 +463,11 @@ static SYMBOL sql_functions[] = {
   { "LCASE",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_lcase)},
   { "LEAST",		SYM(LEAST_SYM),0,0},
   { "LENGTH",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_length)},
+  { "LN",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ln)},
   { "LOAD_FILE",	SYM(FUNC_ARG1),0,CREATE_FUNC(create_load_file)},
   { "LOCATE",		SYM(LOCATE),0,0},
-  { "LOG",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_log)},
+  { "LOG",		SYM(LOG_SYM),0,0},
+  { "LOG2",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_log2)},
   { "LOG10",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_log10)},
   { "LOWER",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_lcase)},
   { "LPAD",		SYM(FUNC_ARG3),0,CREATE_FUNC(create_func_lpad)},

sql/sql_yacc.yy

@@ -233,6 +233,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	LIKE
 %token	LINES
 %token	LOCAL_SYM
+%token	LOG_SYM
 %token	LOGS_SYM
 %token	LONG_NUM
 %token	LONG_SYM
@@ -1781,6 +1782,10 @@ simple_expr:
 	  { $5->push_front($3); $$= new Item_func_max(*$5); }
 	| LEAST_SYM '(' expr ',' expr_list ')'
 	  { $5->push_front($3); $$= new Item_func_min(*$5); }
+	| LOG_SYM '(' expr ')'
+		{ $$= new Item_func_log($3); }
+	| LOG_SYM '(' expr ',' expr ')'
+		{ $$= new Item_func_log($3, $5); }
 	| MINUTE_SYM '(' expr ')'
 	  { $$= new Item_func_minute($3); }
 	| MONTH_SYM '(' expr ')'

tests/function.res

@@ -11,11 +11,11 @@ select floor(5.5),floor(-5.5),ceiling(5.5),ceiling(-5.5),round(5.5),round(-5.5)
 floor(5.5)	floor(-5.5)	ceiling(5.5)	ceiling(-5.5)	round(5.5)	round(-5.5)
 5	-6	6	-5	6	-6
 --------------
-select abs(-10),log(exp(10)),exp(log(sqrt(10))*2),pow(10,log10(10)),rand(999999),rand()
+select abs(-10),log(exp(10)),ln(exp(10)),log2(65535),log(2,65535),exp(log(sqrt(10))*2),pow(10,log10(10)),rand(999999),rand()
 --------------
 
-abs(-10)	log(exp(10))	exp(log(sqrt(10))*2)	pow(10,log10(10))	rand(999999)	rand()
+abs(-10)	log(exp(10))	ln(exp(10))	log2(65535)	log(2,65535)	exp(log(sqrt(10))*2)	pow(10,log10(10))	rand(999999)	rand()
-10	10.000000	10.000000	10.000000	0.1844	0.7637
+10	10.000000	10.000000	2.000000	2.000000	10.000000	10.000000	0.1844	0.7637
 --------------
 select least(6,1.0,2.0),greatest(3,4,5,0)
 --------------

tests/function.tst

@@ -7,7 +7,7 @@
 #
 select 1+1,1-1,1+1*2,8/5,8%5,mod(8,5),mod(8,5)|0,-(1+1)*-2,sign(-5) ;
 select floor(5.5),floor(-5.5),ceiling(5.5),ceiling(-5.5),round(5.5),round(-5.5);
-select abs(-10),log(exp(10)),exp(log(sqrt(10))*2),pow(10,log10(10)),rand(999999),rand();
+select abs(-10),log(exp(10)),ln(exp(10)),log2(65535),log(2,65535),exp(log(sqrt(10))*2),pow(10,log10(10)),rand(999999),rand();
 select least(6,1.0,2.0),greatest(3,4,5,0) ;
 select 1 | (1+1),5 & 3,bit_count(7) ;
 #