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mariadb/sql/item_func.cc
anozdrin/alik@station. 50c8101ad8 Merge station.:/mnt/raid/alik/MySQL/devel/5.0-rt 
into  station.:/mnt/raid/alik/MySQL/devel/5.1-rt-merged
2007-10-10 13:35:40 +04:00

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/* Copyright (C) 2000-2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* This file defines all numerical functions */
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include "slave.h" // for wait_for_master_pos
#include "rpl_mi.h"
#include <m_ctype.h>
#include <hash.h>
#include <time.h>
#include <ft_global.h>
#include "sp_head.h"
#include "sp_rcontext.h"
#include "sp.h"
#ifdef NO_EMBEDDED_ACCESS_CHECKS
#define sp_restore_security_context(A,B) while (0) {}
#endif
bool check_reserved_words(LEX_STRING *name)
{
if (!my_strcasecmp(system_charset_info, name->str, "GLOBAL") ||
!my_strcasecmp(system_charset_info, name->str, "LOCAL") ||
!my_strcasecmp(system_charset_info, name->str, "SESSION"))
return TRUE;
return FALSE;
}
/* return TRUE if item is a constant */
bool
eval_const_cond(COND *cond)
{
return ((Item_func*) cond)->val_int() ? TRUE : FALSE;
}
void Item_func::set_arguments(List<Item> &list)
{
allowed_arg_cols= 1;
arg_count=list.elements;
args= tmp_arg; // If 2 arguments
if (arg_count <= 2 || (args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
{
List_iterator_fast<Item> li(list);
Item *item;
Item **save_args= args;
while ((item=li++))
{
*(save_args++)= item;
with_sum_func|=item->with_sum_func;
}
}
list.empty(); // Fields are used
}
Item_func::Item_func(List<Item> &list)
:allowed_arg_cols(1)
{
set_arguments(list);
}
Item_func::Item_func(THD *thd, Item_func *item)
:Item_result_field(thd, item),
allowed_arg_cols(item->allowed_arg_cols),
arg_count(item->arg_count),
used_tables_cache(item->used_tables_cache),
not_null_tables_cache(item->not_null_tables_cache),
const_item_cache(item->const_item_cache)
{
if (arg_count)
{
if (arg_count <=2)
args= tmp_arg;
else
{
if (!(args=(Item**) thd->alloc(sizeof(Item*)*arg_count)))
return;
}
memcpy((char*) args, (char*) item->args, sizeof(Item*)*arg_count);
}
}
/*
Resolve references to table column for a function and its argument
SYNOPSIS:
fix_fields()
thd Thread object
ref Pointer to where this object is used. This reference
is used if we want to replace this object with another
one (for example in the summary functions).
DESCRIPTION
Call fix_fields() for all arguments to the function. The main intention
is to allow all Item_field() objects to setup pointers to the table fields.
Sets as a side effect the following class variables:
maybe_null Set if any argument may return NULL
with_sum_func Set if any of the arguments contains a sum function
used_tables_cache Set to union of the tables used by arguments
str_value.charset If this is a string function, set this to the
character set for the first argument.
If any argument is binary, this is set to binary
If for any item any of the defaults are wrong, then this can
be fixed in the fix_length_and_dec() function that is called
after this one or by writing a specialized fix_fields() for the
item.
RETURN VALUES
FALSE ok
TRUE Got error. Stored with my_error().
*/
bool
Item_func::fix_fields(THD *thd, Item **ref)
{
DBUG_ASSERT(fixed == 0);
Item **arg,**arg_end;
#ifndef EMBEDDED_LIBRARY // Avoid compiler warning
uchar buff[STACK_BUFF_ALLOC]; // Max argument in function
#endif
used_tables_cache= not_null_tables_cache= 0;
const_item_cache=1;
if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
return TRUE; // Fatal error if flag is set!
if (arg_count)
{ // Print purify happy
for (arg=args, arg_end=args+arg_count; arg != arg_end ; arg++)
{
Item *item;
/*
We can't yet set item to *arg as fix_fields may change *arg
We shouldn't call fix_fields() twice, so check 'fixed' field first
*/
if ((!(*arg)->fixed && (*arg)->fix_fields(thd, arg)))
return TRUE; /* purecov: inspected */
item= *arg;
if (allowed_arg_cols)
{
if (item->check_cols(allowed_arg_cols))
return 1;
}
else
{
/* we have to fetch allowed_arg_cols from first argument */
DBUG_ASSERT(arg == args); // it is first argument
allowed_arg_cols= item->cols();
DBUG_ASSERT(allowed_arg_cols); // Can't be 0 any more
}
if (item->maybe_null)
maybe_null=1;
with_sum_func= with_sum_func || item->with_sum_func;
used_tables_cache|= item->used_tables();
not_null_tables_cache|= item->not_null_tables();
const_item_cache&= item->const_item();
with_subselect|= item->with_subselect;
}
}
fix_length_and_dec();
if (thd->net.report_error) // An error inside fix_length_and_dec occured
return TRUE;
fixed= 1;
return FALSE;
}
bool Item_func::walk(Item_processor processor, bool walk_subquery,
uchar *argument)
{
if (arg_count)
{
Item **arg,**arg_end;
for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
{
if ((*arg)->walk(processor, walk_subquery, argument))
return 1;
}
}
return (this->*processor)(argument);
}
void Item_func::traverse_cond(Cond_traverser traverser,
void *argument, traverse_order order)
{
if (arg_count)
{
Item **arg,**arg_end;
switch (order) {
case(PREFIX):
(*traverser)(this, argument);
for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
{
(*arg)->traverse_cond(traverser, argument, order);
}
break;
case (POSTFIX):
for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
{
(*arg)->traverse_cond(traverser, argument, order);
}
(*traverser)(this, argument);
}
}
else
(*traverser)(this, argument);
}
/*
Transform an Item_func object with a transformer callback function
SYNOPSIS
transform()
transformer the transformer callback function to be applied to the nodes
of the tree of the object
argument parameter to be passed to the transformer
DESCRIPTION
The function recursively applies the transform method to each
argument of the Item_func node.
If the call of the method for an argument item returns a new item
the old item is substituted for a new one.
After this the transformer is applied to the root node
of the Item_func object.
RETURN VALUES
Item returned as the result of transformation of the root node
*/
Item *Item_func::transform(Item_transformer transformer, uchar *argument)
{
DBUG_ASSERT(!current_thd->is_stmt_prepare());
if (arg_count)
{
Item **arg,**arg_end;
for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
{
Item *new_item= (*arg)->transform(transformer, argument);
if (!new_item)
return 0;
/*
THD::change_item_tree() should be called only if the tree was
really transformed, i.e. when a new item has been created.
Otherwise we'll be allocating a lot of unnecessary memory for
change records at each execution.
*/
if (*arg != new_item)
current_thd->change_item_tree(arg, new_item);
}
}
return (this->*transformer)(argument);
}
/*
Compile Item_func object with a processor and a transformer callback functions
SYNOPSIS
compile()
analyzer the analyzer callback function to be applied to the nodes
of the tree of the object
arg_p in/out parameter to be passed to the processor
transformer the transformer callback function to be applied to the nodes
of the tree of the object
arg_t parameter to be passed to the transformer
DESCRIPTION
First the function applies the analyzer to the root node of
the Item_func object. Then if the analizer succeeeds (returns TRUE)
the function recursively applies the compile method to each argument
of the Item_func node.
If the call of the method for an argument item returns a new item
the old item is substituted for a new one.
After this the transformer is applied to the root node
of the Item_func object.
RETURN VALUES
Item returned as the result of transformation of the root node
*/
Item *Item_func::compile(Item_analyzer analyzer, uchar **arg_p,
Item_transformer transformer, uchar *arg_t)
{
if (!(this->*analyzer)(arg_p))
return 0;
if (arg_count)
{
Item **arg,**arg_end;
for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
{
/*
The same parameter value of arg_p must be passed
to analyze any argument of the condition formula.
*/
uchar *arg_v= *arg_p;
Item *new_item= (*arg)->compile(analyzer, &arg_v, transformer, arg_t);
if (new_item && *arg != new_item)
current_thd->change_item_tree(arg, new_item);
}
}
return (this->*transformer)(arg_t);
}
/* See comments in Item_cmp_func::split_sum_func() */
void Item_func::split_sum_func(THD *thd, Item **ref_pointer_array,
List<Item> &fields)
{
Item **arg, **arg_end;
for (arg= args, arg_end= args+arg_count; arg != arg_end ; arg++)
(*arg)->split_sum_func2(thd, ref_pointer_array, fields, arg, TRUE);
}
void Item_func::update_used_tables()
{
used_tables_cache=0;
const_item_cache=1;
for (uint i=0 ; i < arg_count ; i++)
{
args[i]->update_used_tables();
used_tables_cache|=args[i]->used_tables();
const_item_cache&=args[i]->const_item();
}
}
table_map Item_func::used_tables() const
{
return used_tables_cache;
}
table_map Item_func::not_null_tables() const
{
return not_null_tables_cache;
}
void Item_func::print(String *str)
{
str->append(func_name());
str->append('(');
print_args(str, 0);
str->append(')');
}
void Item_func::print_args(String *str, uint from)
{
for (uint i=from ; i < arg_count ; i++)
{
if (i != from)
str->append(',');
args[i]->print(str);
}
}
void Item_func::print_op(String *str)
{
str->append('(');
for (uint i=0 ; i < arg_count-1 ; i++)
{
args[i]->print(str);
str->append(' ');
str->append(func_name());
str->append(' ');
}
args[arg_count-1]->print(str);
str->append(')');
}
bool Item_func::eq(const Item *item, bool binary_cmp) const
{
/* Assume we don't have rtti */
if (this == item)
return 1;
if (item->type() != FUNC_ITEM)
return 0;
Item_func *item_func=(Item_func*) item;
Item_func::Functype func_type;
if ((func_type= functype()) != item_func->functype() ||
arg_count != item_func->arg_count ||
(func_type != Item_func::FUNC_SP &&
func_name() != item_func->func_name()) ||
(func_type == Item_func::FUNC_SP &&
my_strcasecmp(system_charset_info, func_name(), item_func->func_name())))
return 0;
for (uint i=0; i < arg_count ; i++)
if (!args[i]->eq(item_func->args[i], binary_cmp))
return 0;
return 1;
}
Field *Item_func::tmp_table_field(TABLE *table)
{
Field *field;
LINT_INIT(field);
switch (result_type()) {
case INT_RESULT:
if (max_length > MY_INT32_NUM_DECIMAL_DIGITS)
field= new Field_longlong(max_length, maybe_null, name, unsigned_flag);
else
field= new Field_long(max_length, maybe_null, name, unsigned_flag);
break;
case REAL_RESULT:
field= new Field_double(max_length, maybe_null, name, decimals);
break;
case STRING_RESULT:
return make_string_field(table);
break;
case DECIMAL_RESULT:
field= new Field_new_decimal(my_decimal_precision_to_length(decimal_precision(),
decimals,
unsigned_flag),
maybe_null, name, decimals, unsigned_flag);
break;
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
field= 0;
break;
}
if (field)
field->init(table);
return field;
}
bool Item_func::is_expensive_processor(uchar *arg)
{
return is_expensive();
}
my_decimal *Item_func::val_decimal(my_decimal *decimal_value)
{
DBUG_ASSERT(fixed);
int2my_decimal(E_DEC_FATAL_ERROR, val_int(), unsigned_flag, decimal_value);
return decimal_value;
}
String *Item_real_func::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
double nr= val_real();
if (null_value)
return 0; /* purecov: inspected */
str->set_real(nr,decimals, &my_charset_bin);
return str;
}
my_decimal *Item_real_func::val_decimal(my_decimal *decimal_value)
{
DBUG_ASSERT(fixed);
double nr= val_real();
if (null_value)
return 0; /* purecov: inspected */
double2my_decimal(E_DEC_FATAL_ERROR, nr, decimal_value);
return decimal_value;
}
void Item_func::fix_num_length_and_dec()
{
uint fl_length= 0;
decimals=0;
for (uint i=0 ; i < arg_count ; i++)
{
set_if_bigger(decimals,args[i]->decimals);
set_if_bigger(fl_length, args[i]->max_length);
}
max_length=float_length(decimals);
if (fl_length > max_length)
{
decimals= NOT_FIXED_DEC;
max_length= float_length(NOT_FIXED_DEC);
}
}
void Item_func_numhybrid::fix_num_length_and_dec()
{}
/*
Set max_length/decimals of function if function is fixed point and
result length/precision depends on argument ones
SYNOPSIS
Item_func::count_decimal_length()
*/
void Item_func::count_decimal_length()
{
int max_int_part= 0;
decimals= 0;
unsigned_flag= 1;
for (uint i=0 ; i < arg_count ; i++)
{
set_if_bigger(decimals, args[i]->decimals);
set_if_bigger(max_int_part, args[i]->decimal_int_part());
set_if_smaller(unsigned_flag, args[i]->unsigned_flag);
}
int precision= min(max_int_part + decimals, DECIMAL_MAX_PRECISION);
max_length= my_decimal_precision_to_length(precision, decimals,
unsigned_flag);
}
/*
Set max_length of if it is maximum length of its arguments
SYNOPSIS
Item_func::count_only_length()
*/
void Item_func::count_only_length()
{
max_length= 0;
unsigned_flag= 0;
for (uint i=0 ; i < arg_count ; i++)
{
set_if_bigger(max_length, args[i]->max_length);
set_if_bigger(unsigned_flag, args[i]->unsigned_flag);
}
}
/*
Set max_length/decimals of function if function is floating point and
result length/precision depends on argument ones
SYNOPSIS
Item_func::count_real_length()
*/
void Item_func::count_real_length()
{
uint32 length= 0;
decimals= 0;
max_length= 0;
for (uint i=0 ; i < arg_count ; i++)
{
if (decimals != NOT_FIXED_DEC)
{
set_if_bigger(decimals, args[i]->decimals);
set_if_bigger(length, (args[i]->max_length - args[i]->decimals));
}
set_if_bigger(max_length, args[i]->max_length);
}
if (decimals != NOT_FIXED_DEC)
{
max_length= length;
length+= decimals;
if (length < max_length) // If previous operation gave overflow
max_length= UINT_MAX32;
else
max_length= length;
}
}
void Item_func::signal_divide_by_null()
{
THD *thd= current_thd;
if (thd->variables.sql_mode & MODE_ERROR_FOR_DIVISION_BY_ZERO)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_DIVISION_BY_ZERO,
ER(ER_DIVISION_BY_ZERO));
null_value= 1;
}
Item *Item_func::get_tmp_table_item(THD *thd)
{
if (!with_sum_func && !const_item() && functype() != SUSERVAR_FUNC)
return new Item_field(result_field);
return copy_or_same(thd);
}
double Item_int_func::val_real()
{
DBUG_ASSERT(fixed == 1);
return unsigned_flag ? (double) ((ulonglong) val_int()) : (double) val_int();
}
String *Item_int_func::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
longlong nr=val_int();
if (null_value)
return 0;
str->set_int(nr, unsigned_flag, &my_charset_bin);
return str;
}
void Item_func_connection_id::fix_length_and_dec()
{
Item_int_func::fix_length_and_dec();
max_length= 10;
}
bool Item_func_connection_id::fix_fields(THD *thd, Item **ref)
{
if (Item_int_func::fix_fields(thd, ref))
return TRUE;
thd->thread_specific_used= TRUE;
value= thd->variables.pseudo_thread_id;
return FALSE;
}
/*
Check arguments here to determine result's type for a numeric
function of two arguments.
SYNOPSIS
Item_num_op::find_num_type()
*/
void Item_num_op::find_num_type(void)
{
DBUG_ENTER("Item_num_op::find_num_type");
DBUG_PRINT("info", ("name %s", func_name()));
DBUG_ASSERT(arg_count == 2);
Item_result r0= args[0]->result_type();
Item_result r1= args[1]->result_type();
if (r0 == REAL_RESULT || r1 == REAL_RESULT ||
r0 == STRING_RESULT || r1 ==STRING_RESULT)
{
count_real_length();
max_length= float_length(decimals);
hybrid_type= REAL_RESULT;
}
else if (r0 == DECIMAL_RESULT || r1 == DECIMAL_RESULT)
{
hybrid_type= DECIMAL_RESULT;
result_precision();
}
else
{
DBUG_ASSERT(r0 == INT_RESULT && r1 == INT_RESULT);
decimals= 0;
hybrid_type=INT_RESULT;
result_precision();
}
DBUG_PRINT("info", ("Type: %s",
(hybrid_type == REAL_RESULT ? "REAL_RESULT" :
hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
hybrid_type == INT_RESULT ? "INT_RESULT" :
"--ILLEGAL!!!--")));
DBUG_VOID_RETURN;
}
/*
Set result type for a numeric function of one argument
(can be also used by a numeric function of many arguments, if the result
type depends only on the first argument)
SYNOPSIS
Item_func_num1::find_num_type()
*/
void Item_func_num1::find_num_type()
{
DBUG_ENTER("Item_func_num1::find_num_type");
DBUG_PRINT("info", ("name %s", func_name()));
switch (hybrid_type= args[0]->result_type()) {
case INT_RESULT:
unsigned_flag= args[0]->unsigned_flag;
break;
case STRING_RESULT:
case REAL_RESULT:
hybrid_type= REAL_RESULT;
max_length= float_length(decimals);
break;
case DECIMAL_RESULT:
break;
default:
DBUG_ASSERT(0);
}
DBUG_PRINT("info", ("Type: %s",
(hybrid_type == REAL_RESULT ? "REAL_RESULT" :
hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
hybrid_type == INT_RESULT ? "INT_RESULT" :
"--ILLEGAL!!!--")));
DBUG_VOID_RETURN;
}
void Item_func_num1::fix_num_length_and_dec()
{
decimals= args[0]->decimals;
max_length= args[0]->max_length;
}
void Item_func_numhybrid::fix_length_and_dec()
{
fix_num_length_and_dec();
find_num_type();
}
String *Item_func_numhybrid::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
switch (hybrid_type) {
case DECIMAL_RESULT:
{
my_decimal decimal_value, *val;
if (!(val= decimal_op(&decimal_value)))
return 0; // null is set
my_decimal_round(E_DEC_FATAL_ERROR, val, decimals, FALSE, val);
my_decimal2string(E_DEC_FATAL_ERROR, val, 0, 0, 0, str);
break;
}
case INT_RESULT:
{
longlong nr= int_op();
if (null_value)
return 0; /* purecov: inspected */
str->set_int(nr, unsigned_flag, &my_charset_bin);
break;
}
case REAL_RESULT:
{
double nr= real_op();
if (null_value)
return 0; /* purecov: inspected */
str->set_real(nr,decimals,&my_charset_bin);
break;
}
case STRING_RESULT:
return str_op(&str_value);
default:
DBUG_ASSERT(0);
}
return str;
}
double Item_func_numhybrid::val_real()
{
DBUG_ASSERT(fixed == 1);
switch (hybrid_type) {
case DECIMAL_RESULT:
{
my_decimal decimal_value, *val;
double result;
if (!(val= decimal_op(&decimal_value)))
return 0.0; // null is set
my_decimal2double(E_DEC_FATAL_ERROR, val, &result);
return result;
}
case INT_RESULT:
{
longlong result= int_op();
return unsigned_flag ? (double) ((ulonglong) result) : (double) result;
}
case REAL_RESULT:
return real_op();
case STRING_RESULT:
{
char *end_not_used;
int err_not_used;
String *res= str_op(&str_value);
return (res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),
&end_not_used, &err_not_used) : 0.0);
}
default:
DBUG_ASSERT(0);
}
return 0.0;
}
longlong Item_func_numhybrid::val_int()
{
DBUG_ASSERT(fixed == 1);
switch (hybrid_type) {
case DECIMAL_RESULT:
{
my_decimal decimal_value, *val;
if (!(val= decimal_op(&decimal_value)))
return 0; // null is set
longlong result;
my_decimal2int(E_DEC_FATAL_ERROR, val, unsigned_flag, &result);
return result;
}
case INT_RESULT:
return int_op();
case REAL_RESULT:
return (longlong) rint(real_op());
case STRING_RESULT:
{
int err_not_used;
String *res;
if (!(res= str_op(&str_value)))
return 0;
char *end= (char*) res->ptr() + res->length();
CHARSET_INFO *cs= str_value.charset();
return (*(cs->cset->strtoll10))(cs, res->ptr(), &end, &err_not_used);
}
default:
DBUG_ASSERT(0);
}
return 0;
}
my_decimal *Item_func_numhybrid::val_decimal(my_decimal *decimal_value)
{
my_decimal *val= decimal_value;
DBUG_ASSERT(fixed == 1);
switch (hybrid_type) {
case DECIMAL_RESULT:
val= decimal_op(decimal_value);
break;
case INT_RESULT:
{
longlong result= int_op();
int2my_decimal(E_DEC_FATAL_ERROR, result, unsigned_flag, decimal_value);
break;
}
case REAL_RESULT:
{
double result= (double)real_op();
double2my_decimal(E_DEC_FATAL_ERROR, result, decimal_value);
break;
}
case STRING_RESULT:
{
String *res;
if (!(res= str_op(&str_value)))
return NULL;
str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
res->length(), res->charset(), decimal_value);
break;
}
case ROW_RESULT:
default:
DBUG_ASSERT(0);
}
return val;
}
void Item_func_signed::print(String *str)
{
str->append(STRING_WITH_LEN("cast("));
args[0]->print(str);
str->append(STRING_WITH_LEN(" as signed)"));
}
longlong Item_func_signed::val_int_from_str(int *error)
{
char buff[MAX_FIELD_WIDTH], *end, *start;
uint32 length;
String tmp(buff,sizeof(buff), &my_charset_bin), *res;
longlong value;
/*
For a string result, we must first get the string and then convert it
to a longlong
*/
if (!(res= args[0]->val_str(&tmp)))
{
null_value= 1;
*error= 0;
return 0;
}
null_value= 0;
start= (char *)res->ptr();
length= res->length();
end= start + length;
value= my_strtoll10(start, &end, error);
if (*error > 0 || end != start+ length)
{
char err_buff[128];
String err_tmp(err_buff,(uint32) sizeof(err_buff), system_charset_info);
err_tmp.copy(start, length, system_charset_info);
push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TRUNCATED_WRONG_VALUE,
ER(ER_TRUNCATED_WRONG_VALUE), "INTEGER",
err_tmp.c_ptr());
}
return value;
}
longlong Item_func_signed::val_int()
{
longlong value;
int error;
if (args[0]->cast_to_int_type() != STRING_RESULT ||
args[0]->result_as_longlong())
{
value= args[0]->val_int();
null_value= args[0]->null_value;
return value;
}
value= val_int_from_str(&error);
if (value < 0 && error == 0)
{
push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
"Cast to signed converted positive out-of-range integer to "
"it's negative complement");
}
return value;
}
void Item_func_unsigned::print(String *str)
{
str->append(STRING_WITH_LEN("cast("));
args[0]->print(str);
str->append(STRING_WITH_LEN(" as unsigned)"));
}
longlong Item_func_unsigned::val_int()
{
longlong value;
int error;
if (args[0]->cast_to_int_type() == DECIMAL_RESULT)
{
my_decimal tmp, *dec= args[0]->val_decimal(&tmp);
if (!(null_value= args[0]->null_value))
my_decimal2int(E_DEC_FATAL_ERROR, dec, 1, &value);
else
value= 0;
return value;
}
else if (args[0]->cast_to_int_type() != STRING_RESULT ||
args[0]->result_as_longlong())
{
value= args[0]->val_int();
null_value= args[0]->null_value;
return value;
}
value= val_int_from_str(&error);
if (error < 0)
push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
"Cast to unsigned converted negative integer to it's "
"positive complement");
return value;
}
String *Item_decimal_typecast::val_str(String *str)
{
my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
if (null_value)
return NULL;
my_decimal2string(E_DEC_FATAL_ERROR, tmp, 0, 0, 0, str);
return str;
}
double Item_decimal_typecast::val_real()
{
my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
double res;
if (null_value)
return 0.0;
my_decimal2double(E_DEC_FATAL_ERROR, tmp, &res);
return res;
}
longlong Item_decimal_typecast::val_int()
{
my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
longlong res;
if (null_value)
return 0;
my_decimal2int(E_DEC_FATAL_ERROR, tmp, unsigned_flag, &res);
return res;
}
my_decimal *Item_decimal_typecast::val_decimal(my_decimal *dec)
{
my_decimal tmp_buf, *tmp= args[0]->val_decimal(&tmp_buf);
bool sign;
uint precision;
if ((null_value= args[0]->null_value))
return NULL;
my_decimal_round(E_DEC_FATAL_ERROR, tmp, decimals, FALSE, dec);
sign= dec->sign();
if (unsigned_flag)
{
if (sign)
{
my_decimal_set_zero(dec);
goto err;
}
}
precision= my_decimal_length_to_precision(max_length,
decimals, unsigned_flag);
if (precision - decimals < (uint) my_decimal_intg(dec))
{
max_my_decimal(dec, precision, decimals);
dec->sign(sign);
goto err;
}
return dec;
err:
push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
ER_WARN_DATA_OUT_OF_RANGE,
ER(ER_WARN_DATA_OUT_OF_RANGE),
name, 1);
return dec;
}
void Item_decimal_typecast::print(String *str)
{
char len_buf[20*3 + 1];
char *end;
uint precision= my_decimal_length_to_precision(max_length, decimals,
unsigned_flag);
str->append(STRING_WITH_LEN("cast("));
args[0]->print(str);
str->append(STRING_WITH_LEN(" as decimal("));
end=int10_to_str(precision, len_buf,10);
str->append(len_buf, (uint32) (end - len_buf));
str->append(',');
end=int10_to_str(decimals, len_buf,10);
str->append(len_buf, (uint32) (end - len_buf));
str->append(')');
str->append(')');
}
double Item_func_plus::real_op()
{
double value= args[0]->val_real() + args[1]->val_real();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0.0;
return value;
}
longlong Item_func_plus::int_op()
{
longlong value=args[0]->val_int()+args[1]->val_int();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0;
return value;
}
/*
Calculate plus of two decimail's
SYNOPSIS
decimal_op()
decimal_value Buffer that can be used to store result
RETURN
0 Value was NULL; In this case null_value is set
# Value of operation as a decimal
*/
my_decimal *Item_func_plus::decimal_op(my_decimal *decimal_value)
{
my_decimal value1, *val1;
my_decimal value2, *val2;
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if (!(null_value= (args[1]->null_value ||
(my_decimal_add(E_DEC_FATAL_ERROR, decimal_value, val1,
val2) > 3))))
return decimal_value;
return 0;
}
/*
Set precision of results for additive operations (+ and -)
SYNOPSIS
Item_func_additive_op::result_precision()
*/
void Item_func_additive_op::result_precision()
{
decimals= max(args[0]->decimals, args[1]->decimals);
int max_int_part= max(args[0]->decimal_precision() - args[0]->decimals,
args[1]->decimal_precision() - args[1]->decimals);
int precision= min(max_int_part + 1 + decimals, DECIMAL_MAX_PRECISION);
/* Integer operations keep unsigned_flag if one of arguments is unsigned */
if (result_type() == INT_RESULT)
unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
else
unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
max_length= my_decimal_precision_to_length(precision, decimals,
unsigned_flag);
}
/*
The following function is here to allow the user to force
subtraction of UNSIGNED BIGINT to return negative values.
*/
void Item_func_minus::fix_length_and_dec()
{
Item_num_op::fix_length_and_dec();
if (unsigned_flag &&
(current_thd->variables.sql_mode & MODE_NO_UNSIGNED_SUBTRACTION))
unsigned_flag=0;
}
double Item_func_minus::real_op()
{
double value= args[0]->val_real() - args[1]->val_real();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0.0;
return value;
}
longlong Item_func_minus::int_op()
{
longlong value=args[0]->val_int() - args[1]->val_int();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0;
return value;
}
/* See Item_func_plus::decimal_op for comments */
my_decimal *Item_func_minus::decimal_op(my_decimal *decimal_value)
{
my_decimal value1, *val1;
my_decimal value2, *val2=
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if (!(null_value= (args[1]->null_value ||
(my_decimal_sub(E_DEC_FATAL_ERROR, decimal_value, val1,
val2) > 3))))
return decimal_value;
return 0;
}
double Item_func_mul::real_op()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real() * args[1]->val_real();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0.0;
return value;
}
longlong Item_func_mul::int_op()
{
DBUG_ASSERT(fixed == 1);
longlong value=args[0]->val_int()*args[1]->val_int();
if ((null_value=args[0]->null_value || args[1]->null_value))
return 0;
return value;
}
/* See Item_func_plus::decimal_op for comments */
my_decimal *Item_func_mul::decimal_op(my_decimal *decimal_value)
{
my_decimal value1, *val1;
my_decimal value2, *val2;
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if (!(null_value= (args[1]->null_value ||
(my_decimal_mul(E_DEC_FATAL_ERROR, decimal_value, val1,
val2) > 3))))
return decimal_value;
return 0;
}
void Item_func_mul::result_precision()
{
/* Integer operations keep unsigned_flag if one of arguments is unsigned */
if (result_type() == INT_RESULT)
unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
else
unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
decimals= min(args[0]->decimals + args[1]->decimals, DECIMAL_MAX_SCALE);
int precision= min(args[0]->decimal_precision() + args[1]->decimal_precision(),
DECIMAL_MAX_PRECISION);
max_length= my_decimal_precision_to_length(precision, decimals,unsigned_flag);
}
double Item_func_div::real_op()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
double val2= args[1]->val_real();
if ((null_value= args[0]->null_value || args[1]->null_value))
return 0.0;
if (val2 == 0.0)
{
signal_divide_by_null();
return 0.0;
}
return value/val2;
}
my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
{
my_decimal value1, *val1;
my_decimal value2, *val2;
int err;
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if ((null_value= args[1]->null_value))
return 0;
if ((err= my_decimal_div(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
val1, val2, prec_increment)) > 3)
{
if (err == E_DEC_DIV_ZERO)
signal_divide_by_null();
null_value= 1;
return 0;
}
return decimal_value;
}
void Item_func_div::result_precision()
{
uint precision=min(args[0]->decimal_precision() + prec_increment,
DECIMAL_MAX_PRECISION);
/* Integer operations keep unsigned_flag if one of arguments is unsigned */
if (result_type() == INT_RESULT)
unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
else
unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
decimals= min(args[0]->decimals + prec_increment, DECIMAL_MAX_SCALE);
max_length= my_decimal_precision_to_length(precision, decimals,
unsigned_flag);
}
void Item_func_div::fix_length_and_dec()
{
DBUG_ENTER("Item_func_div::fix_length_and_dec");
prec_increment= current_thd->variables.div_precincrement;
Item_num_op::fix_length_and_dec();
switch(hybrid_type) {
case REAL_RESULT:
{
decimals=max(args[0]->decimals,args[1]->decimals)+prec_increment;
set_if_smaller(decimals, NOT_FIXED_DEC);
max_length=args[0]->max_length - args[0]->decimals + decimals;
uint tmp=float_length(decimals);
set_if_smaller(max_length,tmp);
break;
}
case INT_RESULT:
hybrid_type= DECIMAL_RESULT;
DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
result_precision();
break;
case DECIMAL_RESULT:
result_precision();
break;
default:
DBUG_ASSERT(0);
}
maybe_null= 1; // devision by zero
DBUG_VOID_RETURN;
}
/* Integer division */
longlong Item_func_int_div::val_int()
{
DBUG_ASSERT(fixed == 1);
longlong value=args[0]->val_int();
longlong val2=args[1]->val_int();
if ((null_value= (args[0]->null_value || args[1]->null_value)))
return 0;
if (val2 == 0)
{
signal_divide_by_null();
return 0;
}
return (unsigned_flag ?
(ulonglong) value / (ulonglong) val2 :
value / val2);
}
void Item_func_int_div::fix_length_and_dec()
{
max_length=args[0]->max_length - args[0]->decimals;
maybe_null=1;
unsigned_flag=args[0]->unsigned_flag | args[1]->unsigned_flag;
}
longlong Item_func_mod::int_op()
{
DBUG_ASSERT(fixed == 1);
longlong value= args[0]->val_int();
longlong val2= args[1]->val_int();
longlong result;
if ((null_value= args[0]->null_value || args[1]->null_value))
return 0; /* purecov: inspected */
if (val2 == 0)
{
signal_divide_by_null();
return 0;
}
if (args[0]->unsigned_flag)
result= args[1]->unsigned_flag ?
((ulonglong) value) % ((ulonglong) val2) : ((ulonglong) value) % val2;
else
result= args[1]->unsigned_flag ?
value % ((ulonglong) val2) : value % val2;
return result;
}
double Item_func_mod::real_op()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
double val2= args[1]->val_real();
if ((null_value= args[0]->null_value || args[1]->null_value))
return 0.0; /* purecov: inspected */
if (val2 == 0.0)
{
signal_divide_by_null();
return 0.0;
}
return fmod(value,val2);
}
my_decimal *Item_func_mod::decimal_op(my_decimal *decimal_value)
{
my_decimal value1, *val1;
my_decimal value2, *val2;
val1= args[0]->val_decimal(&value1);
if ((null_value= args[0]->null_value))
return 0;
val2= args[1]->val_decimal(&value2);
if ((null_value= args[1]->null_value))
return 0;
switch (my_decimal_mod(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
val1, val2)) {
case E_DEC_TRUNCATED:
case E_DEC_OK:
return decimal_value;
case E_DEC_DIV_ZERO:
signal_divide_by_null();
default:
null_value= 1;
return 0;
}
}
void Item_func_mod::result_precision()
{
decimals= max(args[0]->decimals, args[1]->decimals);
max_length= max(args[0]->max_length, args[1]->max_length);
}
void Item_func_mod::fix_length_and_dec()
{
Item_num_op::fix_length_and_dec();
maybe_null= 1;
unsigned_flag= args[0]->unsigned_flag;
}
double Item_func_neg::real_op()
{
double value= args[0]->val_real();
null_value= args[0]->null_value;
return -value;
}
longlong Item_func_neg::int_op()
{
longlong value= args[0]->val_int();
null_value= args[0]->null_value;
return -value;
}
my_decimal *Item_func_neg::decimal_op(my_decimal *decimal_value)
{
my_decimal val, *value= args[0]->val_decimal(&val);
if (!(null_value= args[0]->null_value))
{
my_decimal2decimal(value, decimal_value);
my_decimal_neg(decimal_value);
return decimal_value;
}
return 0;
}
void Item_func_neg::fix_num_length_and_dec()
{
decimals= args[0]->decimals;
/* 1 add because sign can appear */
max_length= args[0]->max_length + 1;
}
void Item_func_neg::fix_length_and_dec()
{
DBUG_ENTER("Item_func_neg::fix_length_and_dec");
Item_func_num1::fix_length_and_dec();
/*
If this is in integer context keep the context as integer if possible
(This is how multiplication and other integer functions works)
Use val() to get value as arg_type doesn't mean that item is
Item_int or Item_real due to existence of Item_param.
*/
if (hybrid_type == INT_RESULT && args[0]->const_item())
{
longlong val= args[0]->val_int();
if ((ulonglong) val >= (ulonglong) LONGLONG_MIN &&
((ulonglong) val != (ulonglong) LONGLONG_MIN ||
args[0]->type() != INT_ITEM))
{
/*
Ensure that result is converted to DECIMAL, as longlong can't hold
the negated number
*/
hybrid_type= DECIMAL_RESULT;
DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
}
}
unsigned_flag= 0;
DBUG_VOID_RETURN;
}
double Item_func_abs::real_op()
{
double value= args[0]->val_real();
null_value= args[0]->null_value;
return fabs(value);
}
longlong Item_func_abs::int_op()
{
longlong value= args[0]->val_int();
if ((null_value= args[0]->null_value))
return 0;
return (value >= 0) || unsigned_flag ? value : -value;
}
my_decimal *Item_func_abs::decimal_op(my_decimal *decimal_value)
{
my_decimal val, *value= args[0]->val_decimal(&val);
if (!(null_value= args[0]->null_value))
{
my_decimal2decimal(value, decimal_value);
if (decimal_value->sign())
my_decimal_neg(decimal_value);
return decimal_value;
}
return 0;
}
void Item_func_abs::fix_length_and_dec()
{
Item_func_num1::fix_length_and_dec();
unsigned_flag= args[0]->unsigned_flag;
}
/* Gateway to natural LOG function */
double Item_func_ln::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value= args[0]->null_value))
return 0.0;
if (value <= 0.0)
{
signal_divide_by_null();
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_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value= args[0]->null_value))
return 0.0;
if (value <= 0.0)
{
signal_divide_by_null();
return 0.0;
}
if (arg_count == 2)
{
double value2= args[1]->val_real();
if ((null_value= args[1]->null_value))
return 0.0;
if (value2 <= 0.0 || value == 1.0)
{
signal_divide_by_null();
return 0.0;
}
return log(value2) / log(value);
}
return log(value);
}
double Item_func_log2::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0.0;
if (value <= 0.0)
{
signal_divide_by_null();
return 0.0;
}
return log(value) / M_LN2;
}
double Item_func_log10::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value= args[0]->null_value))
return 0.0;
if (value <= 0.0)
{
signal_divide_by_null();
return 0.0;
}
return log10(value);
}
double Item_func_exp::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0.0; /* purecov: inspected */
return exp(value);
}
double Item_func_sqrt::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=(args[0]->null_value || value < 0)))
return 0.0; /* purecov: inspected */
return sqrt(value);
}
double Item_func_pow::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
double val2= args[1]->val_real();
if ((null_value=(args[0]->null_value || args[1]->null_value)))
return 0.0; /* purecov: inspected */
return pow(value,val2);
}
// Trigonometric functions
double Item_func_acos::val_real()
{
DBUG_ASSERT(fixed == 1);
// the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
volatile double value= args[0]->val_real();
if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
return 0.0;
return fix_result(acos(value));
}
double Item_func_asin::val_real()
{
DBUG_ASSERT(fixed == 1);
// the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
volatile double value= args[0]->val_real();
if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
return 0.0;
return fix_result(asin(value));
}
double Item_func_atan::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0.0;
if (arg_count == 2)
{
double val2= args[1]->val_real();
if ((null_value=args[1]->null_value))
return 0.0;
return fix_result(atan2(value,val2));
}
return fix_result(atan(value));
}
double Item_func_cos::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0.0;
return fix_result(cos(value));
}
double Item_func_sin::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0.0;
return fix_result(sin(value));
}
double Item_func_tan::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0.0;
return fix_result(tan(value));
}
// Shift-functions, same as << and >> in C/C++
longlong Item_func_shift_left::val_int()
{
DBUG_ASSERT(fixed == 1);
uint shift;
ulonglong res= ((ulonglong) args[0]->val_int() <<
(shift=(uint) args[1]->val_int()));
if (args[0]->null_value || args[1]->null_value)
{
null_value=1;
return 0;
}
null_value=0;
return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}
longlong Item_func_shift_right::val_int()
{
DBUG_ASSERT(fixed == 1);
uint shift;
ulonglong res= (ulonglong) args[0]->val_int() >>
(shift=(uint) args[1]->val_int());
if (args[0]->null_value || args[1]->null_value)
{
null_value=1;
return 0;
}
null_value=0;
return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}
longlong Item_func_bit_neg::val_int()
{
DBUG_ASSERT(fixed == 1);
ulonglong res= (ulonglong) args[0]->val_int();
if ((null_value=args[0]->null_value))
return 0;
return ~res;
}
// Conversion functions
void Item_func_integer::fix_length_and_dec()
{
max_length=args[0]->max_length - args[0]->decimals+1;
uint tmp=float_length(decimals);
set_if_smaller(max_length,tmp);
decimals=0;
}
void Item_func_int_val::fix_num_length_and_dec()
{
max_length= args[0]->max_length - (args[0]->decimals ?
args[0]->decimals + 1 :
0) + 2;
uint tmp= float_length(decimals);
set_if_smaller(max_length,tmp);
decimals= 0;
}
void Item_func_int_val::find_num_type()
{
DBUG_ENTER("Item_func_int_val::find_num_type");
DBUG_PRINT("info", ("name %s", func_name()));
switch(hybrid_type= args[0]->result_type())
{
case STRING_RESULT:
case REAL_RESULT:
hybrid_type= REAL_RESULT;
max_length= float_length(decimals);
break;
case INT_RESULT:
case DECIMAL_RESULT:
/*
-2 because in most high position can't be used any digit for longlong
and one position for increasing value during operation
*/
if ((args[0]->max_length - args[0]->decimals) >=
(DECIMAL_LONGLONG_DIGITS - 2))
{
hybrid_type= DECIMAL_RESULT;
}
else
{
unsigned_flag= args[0]->unsigned_flag;
hybrid_type= INT_RESULT;
}
break;
default:
DBUG_ASSERT(0);
}
DBUG_PRINT("info", ("Type: %s",
(hybrid_type == REAL_RESULT ? "REAL_RESULT" :
hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
hybrid_type == INT_RESULT ? "INT_RESULT" :
"--ILLEGAL!!!--")));
DBUG_VOID_RETURN;
}
longlong Item_func_ceiling::int_op()
{
longlong result;
switch (args[0]->result_type()) {
case INT_RESULT:
result= args[0]->val_int();
null_value= args[0]->null_value;
break;
case DECIMAL_RESULT:
{
my_decimal dec_buf, *dec;
if ((dec= Item_func_ceiling::decimal_op(&dec_buf)))
my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
else
result= 0;
break;
}
default:
result= (longlong)Item_func_ceiling::real_op();
};
return result;
}
double Item_func_ceiling::real_op()
{
/*
the volatile's for BUG #3051 to calm optimizer down (because of gcc's
bug)
*/
volatile double value= args[0]->val_real();
null_value= args[0]->null_value;
return ceil(value);
}
my_decimal *Item_func_ceiling::decimal_op(my_decimal *decimal_value)
{
my_decimal val, *value= args[0]->val_decimal(&val);
if (!(null_value= (args[0]->null_value ||
my_decimal_ceiling(E_DEC_FATAL_ERROR, value,
decimal_value) > 1)))
return decimal_value;
return 0;
}
longlong Item_func_floor::int_op()
{
longlong result;
switch (args[0]->result_type()) {
case INT_RESULT:
result= args[0]->val_int();
null_value= args[0]->null_value;
break;
case DECIMAL_RESULT:
{
my_decimal dec_buf, *dec;
if ((dec= Item_func_floor::decimal_op(&dec_buf)))
my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
else
result= 0;
break;
}
default:
result= (longlong)Item_func_floor::real_op();
};
return result;
}
double Item_func_floor::real_op()
{
/*
the volatile's for BUG #3051 to calm optimizer down (because of gcc's
bug)
*/
volatile double value= args[0]->val_real();
null_value= args[0]->null_value;
return floor(value);
}
my_decimal *Item_func_floor::decimal_op(my_decimal *decimal_value)
{
my_decimal val, *value= args[0]->val_decimal(&val);
if (!(null_value= (args[0]->null_value ||
my_decimal_floor(E_DEC_FATAL_ERROR, value,
decimal_value) > 1)))
return decimal_value;
return 0;
}
void Item_func_round::fix_length_and_dec()
{
int decimals_to_set;
longlong val1;
bool val1_unsigned;
unsigned_flag= args[0]->unsigned_flag;
if (!args[1]->const_item())
{
max_length= args[0]->max_length;
decimals= args[0]->decimals;
if (args[0]->result_type() == DECIMAL_RESULT)
{
max_length++;
hybrid_type= DECIMAL_RESULT;
}
else
hybrid_type= REAL_RESULT;
return;
}
val1= args[1]->val_int();
val1_unsigned= args[1]->unsigned_flag;
if (val1 < 0)
decimals_to_set= val1_unsigned ? INT_MAX : 0;
else
decimals_to_set= (val1 > INT_MAX) ? INT_MAX : (int) val1;
if (args[0]->decimals == NOT_FIXED_DEC)
{
max_length= args[0]->max_length;
decimals= min(decimals_to_set, NOT_FIXED_DEC);
hybrid_type= REAL_RESULT;
return;
}
switch (args[0]->result_type()) {
case REAL_RESULT:
case STRING_RESULT:
hybrid_type= REAL_RESULT;
decimals= min(decimals_to_set, NOT_FIXED_DEC);
max_length= float_length(decimals);
break;
case INT_RESULT:
if ((!decimals_to_set && truncate) || (args[0]->decimal_precision() < DECIMAL_LONGLONG_DIGITS))
{
int length_can_increase= test(!truncate && (val1 < 0) && !val1_unsigned);
max_length= args[0]->max_length + length_can_increase;
/* Here we can keep INT_RESULT */
hybrid_type= INT_RESULT;
decimals= 0;
break;
}
/* fall through */
case DECIMAL_RESULT:
{
hybrid_type= DECIMAL_RESULT;
int decimals_delta= args[0]->decimals - decimals_to_set;
int precision= args[0]->decimal_precision();
int length_increase= ((decimals_delta <= 0) || truncate) ? 0:1;
precision-= decimals_delta - length_increase;
decimals= decimals_to_set;
max_length= my_decimal_precision_to_length(precision, decimals,
unsigned_flag);
break;
}
default:
DBUG_ASSERT(0); /* This result type isn't handled */
}
}
double my_double_round(double value, longlong dec, bool dec_unsigned,
bool truncate)
{
double tmp;
bool dec_negative= (dec < 0) && !dec_unsigned;
ulonglong abs_dec= dec_negative ? -dec : dec;
/*
tmp2 is here to avoid return the value with 80 bit precision
This will fix that the test round(0.1,1) = round(0.1,1) is true
*/
volatile double tmp2;
tmp=(abs_dec < array_elements(log_10) ?
log_10[abs_dec] : pow(10.0,(double) abs_dec));
if (dec_negative && my_isinf(tmp))
tmp2= 0;
else if (!dec_negative && my_isinf(value * tmp))
tmp2= value;
else if (truncate)
{
if (value >= 0)
tmp2= dec < 0 ? floor(value/tmp)*tmp : floor(value*tmp)/tmp;
else
tmp2= dec < 0 ? ceil(value/tmp)*tmp : ceil(value*tmp)/tmp;
}
else
tmp2=dec < 0 ? rint(value/tmp)*tmp : rint(value*tmp)/tmp;
return tmp2;
}
double Item_func_round::real_op()
{
double value= args[0]->val_real();
if (!(null_value= args[0]->null_value || args[1]->null_value))
return my_double_round(value, args[1]->val_int(), args[1]->unsigned_flag,
truncate);
return 0.0;
}
/*
Rounds a given value to a power of 10 specified as the 'to' argument,
avoiding overflows when the value is close to the ulonglong range boundary.
*/
static inline ulonglong my_unsigned_round(ulonglong value, ulonglong to)
{
ulonglong tmp= value / to * to;
return (value - tmp < (to >> 1)) ? tmp : tmp + to;
}
longlong Item_func_round::int_op()
{
longlong value= args[0]->val_int();
longlong dec= args[1]->val_int();
decimals= 0;
ulonglong abs_dec;
if ((null_value= args[0]->null_value || args[1]->null_value))
return 0;
if ((dec >= 0) || args[1]->unsigned_flag)
return value; // integer have not digits after point
abs_dec= -dec;
longlong tmp;
if(abs_dec >= array_elements(log_10_int))
return 0;
tmp= log_10_int[abs_dec];
if (truncate)
value= (unsigned_flag) ?
((ulonglong) value / tmp) * tmp : (value / tmp) * tmp;
else
value= (unsigned_flag || value >= 0) ?
my_unsigned_round((ulonglong) value, tmp) :
-(longlong) my_unsigned_round((ulonglong) -value, tmp);
return value;
}
my_decimal *Item_func_round::decimal_op(my_decimal *decimal_value)
{
my_decimal val, *value= args[0]->val_decimal(&val);
longlong dec= args[1]->val_int();
if (dec > 0 || (dec < 0 && args[1]->unsigned_flag))
{
dec= min((ulonglong) dec, DECIMAL_MAX_SCALE);
decimals= (uint8) dec; // to get correct output
}
else if (dec < INT_MIN)
dec= INT_MIN;
if (!(null_value= (args[0]->null_value || args[1]->null_value ||
my_decimal_round(E_DEC_FATAL_ERROR, value, (int) dec,
truncate, decimal_value) > 1)))
return decimal_value;
return 0;
}
void Item_func_rand::seed_random(Item *arg)
{
/*
TODO: do not do reinit 'rand' for every execute of PS/SP if
args[0] is a constant.
*/
uint32 tmp= (uint32) arg->val_int();
randominit(rand, (uint32) (tmp*0x10001L+55555555L),
(uint32) (tmp*0x10000001L));
}
bool Item_func_rand::fix_fields(THD *thd,Item **ref)
{
if (Item_real_func::fix_fields(thd, ref))
return TRUE;
used_tables_cache|= RAND_TABLE_BIT;
if (arg_count)
{ // Only use argument once in query
/*
Allocate rand structure once: we must use thd->stmt_arena
to create rand in proper mem_root if it's a prepared statement or
stored procedure.
No need to send a Rand log event if seed was given eg: RAND(seed),
as it will be replicated in the query as such.
*/
if (!rand && !(rand= (struct rand_struct*)
thd->stmt_arena->alloc(sizeof(*rand))))
return TRUE;
if (args[0]->const_item())
seed_random (args[0]);
}
else
{
/*
Save the seed only the first time RAND() is used in the query
Once events are forwarded rather than recreated,
the following can be skipped if inside the slave thread
*/
if (!thd->rand_used)
{
thd->rand_used= 1;
thd->rand_saved_seed1= thd->rand.seed1;
thd->rand_saved_seed2= thd->rand.seed2;
}
rand= &thd->rand;
}
return FALSE;
}
void Item_func_rand::update_used_tables()
{
Item_real_func::update_used_tables();
used_tables_cache|= RAND_TABLE_BIT;
}
double Item_func_rand::val_real()
{
DBUG_ASSERT(fixed == 1);
if (arg_count && !args[0]->const_item())
seed_random (args[0]);
return my_rnd(rand);
}
longlong Item_func_sign::val_int()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
null_value=args[0]->null_value;
return value < 0.0 ? -1 : (value > 0 ? 1 : 0);
}
double Item_func_units::val_real()
{
DBUG_ASSERT(fixed == 1);
double value= args[0]->val_real();
if ((null_value=args[0]->null_value))
return 0;
return value*mul+add;
}
void Item_func_min_max::fix_length_and_dec()
{
int max_int_part=0;
bool datetime_found= FALSE;
decimals=0;
max_length=0;
maybe_null=0;
cmp_type=args[0]->result_type();
for (uint i=0 ; i < arg_count ; i++)
{
set_if_bigger(max_length, args[i]->max_length);
set_if_bigger(decimals, args[i]->decimals);
set_if_bigger(max_int_part, args[i]->decimal_int_part());
if (args[i]->maybe_null)
maybe_null=1;
cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
if (args[i]->result_type() != ROW_RESULT && args[i]->is_datetime())
{
datetime_found= TRUE;
if (!datetime_item || args[i]->field_type() == MYSQL_TYPE_DATETIME)
datetime_item= args[i];
}
}
if (cmp_type == STRING_RESULT)
{
agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV, 1);
if (datetime_found)
{
thd= current_thd;
compare_as_dates= TRUE;
}
}
else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
max_length= my_decimal_precision_to_length(max_int_part+decimals, decimals,
unsigned_flag);
}
/*
Compare item arguments in the DATETIME context.
SYNOPSIS
cmp_datetimes()
value [out] found least/greatest DATE/DATETIME value
DESCRIPTION
Compare item arguments as DATETIME values and return the index of the
least/greatest argument in the arguments array.
The correct integer DATE/DATETIME value of the found argument is
stored to the value pointer, if latter is provided.
RETURN
0 If one of arguments is NULL
# index of the least/greatest argument
*/
uint Item_func_min_max::cmp_datetimes(ulonglong *value)
{
ulonglong min_max;
uint min_max_idx= 0;
LINT_INIT(min_max);
for (uint i=0; i < arg_count ; i++)
{
Item **arg= args + i;
bool is_null;
ulonglong res= get_datetime_value(thd, &arg, 0, datetime_item, &is_null);
if ((null_value= args[i]->null_value))
return 0;
if (i == 0 || (res < min_max ? cmp_sign : -cmp_sign) > 0)
{
min_max= res;
min_max_idx= i;
}
}
if (value)
{
*value= min_max;
if (datetime_item->field_type() == MYSQL_TYPE_DATE)
*value/= 1000000L;
}
return min_max_idx;
}
String *Item_func_min_max::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
if (compare_as_dates)
{
String *str_res;
uint min_max_idx= cmp_datetimes(NULL);
if (null_value)
return 0;
str_res= args[min_max_idx]->val_str(str);
str_res->set_charset(collation.collation);
return str_res;
}
switch (cmp_type) {
case INT_RESULT:
{
longlong nr=val_int();
if (null_value)
return 0;
str->set_int(nr, unsigned_flag, &my_charset_bin);
return str;
}
case DECIMAL_RESULT:
{
my_decimal dec_buf, *dec_val= val_decimal(&dec_buf);
if (null_value)
return 0;
my_decimal2string(E_DEC_FATAL_ERROR, dec_val, 0, 0, 0, str);
return str;
}
case REAL_RESULT:
{
double nr= val_real();
if (null_value)
return 0; /* purecov: inspected */
str->set_real(nr,decimals,&my_charset_bin);
return str;
}
case STRING_RESULT:
{
String *res;
LINT_INIT(res);
for (uint i=0; i < arg_count ; i++)
{
if (i == 0)
res=args[i]->val_str(str);
else
{
String *res2;
res2= args[i]->val_str(res == str ? &tmp_value : str);
if (res2)
{
int cmp= sortcmp(res,res2,collation.collation);
if ((cmp_sign < 0 ? cmp : -cmp) < 0)
res=res2;
}
}
if ((null_value= args[i]->null_value))
return 0;
}
res->set_charset(collation.collation);
return res;
}
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
return 0;
}
return 0; // Keep compiler happy
}
double Item_func_min_max::val_real()
{
DBUG_ASSERT(fixed == 1);
double value=0.0;
if (compare_as_dates)
{
ulonglong result= 0;
(void)cmp_datetimes(&result);
return (double)result;
}
for (uint i=0; i < arg_count ; i++)
{
if (i == 0)
value= args[i]->val_real();
else
{
double tmp= args[i]->val_real();
if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
value=tmp;
}
if ((null_value= args[i]->null_value))
break;
}
return value;
}
longlong Item_func_min_max::val_int()
{
DBUG_ASSERT(fixed == 1);
longlong value=0;
if (compare_as_dates)
{
ulonglong result= 0;
(void)cmp_datetimes(&result);
return (longlong)result;
}
for (uint i=0; i < arg_count ; i++)
{
if (i == 0)
value=args[i]->val_int();
else
{
longlong tmp=args[i]->val_int();
if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
value=tmp;
}
if ((null_value= args[i]->null_value))
break;
}
return value;
}
my_decimal *Item_func_min_max::val_decimal(my_decimal *dec)
{
DBUG_ASSERT(fixed == 1);
my_decimal tmp_buf, *tmp, *res;
LINT_INIT(res);
if (compare_as_dates)
{
ulonglong value= 0;
(void)cmp_datetimes(&value);
ulonglong2decimal(value, dec);
return dec;
}
for (uint i=0; i < arg_count ; i++)
{
if (i == 0)
res= args[i]->val_decimal(dec);
else
{
tmp= args[i]->val_decimal(&tmp_buf); // Zero if NULL
if (tmp && (my_decimal_cmp(tmp, res) * cmp_sign) < 0)
{
if (tmp == &tmp_buf)
{
/* Move value out of tmp_buf as this will be reused on next loop */
my_decimal2decimal(tmp, dec);
res= dec;
}
else
res= tmp;
}
}
if ((null_value= args[i]->null_value))
{
res= 0;
break;
}
}
return res;
}
longlong Item_func_length::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
if (!res)
{
null_value=1;
return 0; /* purecov: inspected */
}
null_value=0;
return (longlong) res->length();
}
longlong Item_func_char_length::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
if (!res)
{
null_value=1;
return 0; /* purecov: inspected */
}
null_value=0;
return (longlong) res->numchars();
}
longlong Item_func_coercibility::val_int()
{
DBUG_ASSERT(fixed == 1);
null_value= 0;
return (longlong) args[0]->collation.derivation;
}
void Item_func_locate::fix_length_and_dec()
{
max_length= MY_INT32_NUM_DECIMAL_DIGITS;
agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
}
longlong Item_func_locate::val_int()
{
DBUG_ASSERT(fixed == 1);
String *a=args[0]->val_str(&value1);
String *b=args[1]->val_str(&value2);
if (!a || !b)
{
null_value=1;
return 0; /* purecov: inspected */
}
null_value=0;
/* must be longlong to avoid truncation */
longlong start= 0;
longlong start0= 0;
my_match_t match;
if (arg_count == 3)
{
start0= start= args[2]->val_int() - 1;
if ((start < 0) || (start > a->length()))
return 0;
/* start is now sufficiently valid to pass to charpos function */
start= a->charpos((int) start);
if (start + b->length() > a->length())
return 0;
}
if (!b->length()) // Found empty string at start
return start + 1;
if (!cmp_collation.collation->coll->instr(cmp_collation.collation,
a->ptr()+start,
(uint) (a->length()-start),
b->ptr(), b->length(),
&match, 1))
return 0;
return (longlong) match.mb_len + start0 + 1;
}
void Item_func_locate::print(String *str)
{
str->append(STRING_WITH_LEN("locate("));
args[1]->print(str);
str->append(',');
args[0]->print(str);
if (arg_count == 3)
{
str->append(',');
args[2]->print(str);
}
str->append(')');
}
longlong Item_func_field::val_int()
{
DBUG_ASSERT(fixed == 1);
if (cmp_type == STRING_RESULT)
{
String *field;
if (!(field= args[0]->val_str(&value)))
return 0;
for (uint i=1 ; i < arg_count ; i++)
{
String *tmp_value=args[i]->val_str(&tmp);
if (tmp_value && !sortcmp(field,tmp_value,cmp_collation.collation))
return (longlong) (i);
}
}
else if (cmp_type == INT_RESULT)
{
longlong val= args[0]->val_int();
if (args[0]->null_value)
return 0;
for (uint i=1; i < arg_count ; i++)
{
if (val == args[i]->val_int() && !args[i]->null_value)
return (longlong) (i);
}
}
else if (cmp_type == DECIMAL_RESULT)
{
my_decimal dec_arg_buf, *dec_arg,
dec_buf, *dec= args[0]->val_decimal(&dec_buf);
if (args[0]->null_value)
return 0;
for (uint i=1; i < arg_count; i++)
{
dec_arg= args[i]->val_decimal(&dec_arg_buf);
if (!args[i]->null_value && !my_decimal_cmp(dec_arg, dec))
return (longlong) (i);
}
}
else
{
double val= args[0]->val_real();
if (args[0]->null_value)
return 0;
for (uint i=1; i < arg_count ; i++)
{
if (val == args[i]->val_real() && !args[i]->null_value)
return (longlong) (i);
}
}
return 0;
}
void Item_func_field::fix_length_and_dec()
{
maybe_null=0; max_length=3;
cmp_type= args[0]->result_type();
for (uint i=1; i < arg_count ; i++)
cmp_type= item_cmp_type(cmp_type, args[i]->result_type());
if (cmp_type == STRING_RESULT)
agg_arg_charsets(cmp_collation, args, arg_count, MY_COLL_CMP_CONV, 1);
}
longlong Item_func_ascii::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
if (!res)
{
null_value=1;
return 0;
}
null_value=0;
return (longlong) (res->length() ? (uchar) (*res)[0] : (uchar) 0);
}
longlong Item_func_ord::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
if (!res)
{
null_value=1;
return 0;
}
null_value=0;
if (!res->length()) return 0;
#ifdef USE_MB
if (use_mb(res->charset()))
{
register const char *str=res->ptr();
register uint32 n=0, l=my_ismbchar(res->charset(),str,str+res->length());
if (!l)
return (longlong)((uchar) *str);
while (l--)
n=(n<<8)|(uint32)((uchar) *str++);
return (longlong) n;
}
#endif
return (longlong) ((uchar) (*res)[0]);
}
/* Search after a string in a string of strings separated by ',' */
/* Returns number of found type >= 1 or 0 if not found */
/* This optimizes searching in enums to bit testing! */
void Item_func_find_in_set::fix_length_and_dec()
{
decimals=0;
max_length=3; // 1-999
if (args[0]->const_item() && args[1]->type() == FIELD_ITEM)
{
Field *field= ((Item_field*) args[1])->field;
if (field->real_type() == MYSQL_TYPE_SET)
{
String *find=args[0]->val_str(&value);
if (find)
{
enum_value= find_type(((Field_enum*) field)->typelib,find->ptr(),
find->length(), 0);
enum_bit=0;
if (enum_value)
enum_bit=LL(1) << (enum_value-1);
}
}
}
agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
}
static const char separator=',';
longlong Item_func_find_in_set::val_int()
{
DBUG_ASSERT(fixed == 1);
if (enum_value)
{
ulonglong tmp=(ulonglong) args[1]->val_int();
if (!(null_value=args[1]->null_value || args[0]->null_value))
{
if (tmp & enum_bit)
return enum_value;
}
return 0L;
}
String *find=args[0]->val_str(&value);
String *buffer=args[1]->val_str(&value2);
if (!find || !buffer)
{
null_value=1;
return 0; /* purecov: inspected */
}
null_value=0;
int diff;
if ((diff=buffer->length() - find->length()) >= 0)
{
my_wc_t wc;
CHARSET_INFO *cs= cmp_collation.collation;
const char *str_begin= buffer->ptr();
const char *str_end= buffer->ptr();
const char *real_end= str_end+buffer->length();
const uchar *find_str= (const uchar *) find->ptr();
uint find_str_len= find->length();
int position= 0;
while (1)
{
int symbol_len;
if ((symbol_len= cs->cset->mb_wc(cs, &wc, (uchar*) str_end,
(uchar*) real_end)) > 0)
{
const char *substr_end= str_end + symbol_len;
bool is_last_item= (substr_end == real_end);
bool is_separator= (wc == (my_wc_t) separator);
if (is_separator || is_last_item)
{
position++;
if (is_last_item && !is_separator)
str_end= substr_end;
if (!my_strnncoll(cs, (const uchar *) str_begin,
str_end - str_begin,
find_str, find_str_len))
return (longlong) position;
else
str_begin= substr_end;
}
str_end= substr_end;
}
else if (str_end - str_begin == 0 &&
find_str_len == 0 &&
wc == (my_wc_t) separator)
return (longlong) ++position;
else
return LL(0);
}
}
return 0;
}
longlong Item_func_bit_count::val_int()
{
DBUG_ASSERT(fixed == 1);
ulonglong value= (ulonglong) args[0]->val_int();
if ((null_value= args[0]->null_value))
return 0; /* purecov: inspected */
return (longlong) my_count_bits(value);
}
/****************************************************************************
** Functions to handle dynamic loadable functions
** Original source by: Alexis Mikhailov <root@medinf.chuvashia.su>
** Rewritten by monty.
****************************************************************************/
#ifdef HAVE_DLOPEN
void udf_handler::cleanup()
{
if (!not_original)
{
if (initialized)
{
if (u_d->func_deinit != NULL)
{
Udf_func_deinit deinit= u_d->func_deinit;
(*deinit)(&initid);
}
free_udf(u_d);
initialized= FALSE;
}
if (buffers) // Because of bug in ecc
delete [] buffers;
buffers= 0;
}
}
bool
udf_handler::fix_fields(THD *thd, Item_result_field *func,
uint arg_count, Item **arguments)
{
#ifndef EMBEDDED_LIBRARY // Avoid compiler warning
uchar buff[STACK_BUFF_ALLOC]; // Max argument in function
#endif
DBUG_ENTER("Item_udf_func::fix_fields");
if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
DBUG_RETURN(TRUE); // Fatal error flag is set!
udf_func *tmp_udf=find_udf(u_d->name.str,(uint) u_d->name.length,1);
if (!tmp_udf)
{
my_error(ER_CANT_FIND_UDF, MYF(0), u_d->name.str, errno);
DBUG_RETURN(TRUE);
}
u_d=tmp_udf;
args=arguments;
/* Fix all arguments */
func->maybe_null=0;
used_tables_cache=0;
const_item_cache=1;
if ((f_args.arg_count=arg_count))
{
if (!(f_args.arg_type= (Item_result*)
sql_alloc(f_args.arg_count*sizeof(Item_result))))
{
free_udf(u_d);
DBUG_RETURN(TRUE);
}
uint i;
Item **arg,**arg_end;
for (i=0, arg=arguments, arg_end=arguments+arg_count;
arg != arg_end ;
arg++,i++)
{
if (!(*arg)->fixed &&
(*arg)->fix_fields(thd, arg))
DBUG_RETURN(1);
// we can't assign 'item' before, because fix_fields() can change arg
Item *item= *arg;
if (item->check_cols(1))
DBUG_RETURN(TRUE);
/*
TODO: We should think about this. It is not always
right way just to set an UDF result to return my_charset_bin
if one argument has binary sorting order.
The result collation should be calculated according to arguments
derivations in some cases and should not in other cases.
Moreover, some arguments can represent a numeric input
which doesn't effect the result character set and collation.
There is no a general rule for UDF. Everything depends on
the particular user defined function.
*/
if (item->collation.collation->state & MY_CS_BINSORT)
func->collation.set(&my_charset_bin);
if (item->maybe_null)
func->maybe_null=1;
func->with_sum_func= func->with_sum_func || item->with_sum_func;
used_tables_cache|=item->used_tables();
const_item_cache&=item->const_item();
f_args.arg_type[i]=item->result_type();
}
//TODO: why all following memory is not allocated with 1 call of sql_alloc?
if (!(buffers=new String[arg_count]) ||
!(f_args.args= (char**) sql_alloc(arg_count * sizeof(char *))) ||
!(f_args.lengths= (ulong*) sql_alloc(arg_count * sizeof(long))) ||
!(f_args.maybe_null= (char*) sql_alloc(arg_count * sizeof(char))) ||
!(num_buffer= (char*) sql_alloc(arg_count *
ALIGN_SIZE(sizeof(double)))) ||
!(f_args.attributes= (char**) sql_alloc(arg_count * sizeof(char *))) ||
!(f_args.attribute_lengths= (ulong*) sql_alloc(arg_count *
sizeof(long))))
{
free_udf(u_d);
DBUG_RETURN(TRUE);
}
}
func->fix_length_and_dec();
initid.max_length=func->max_length;
initid.maybe_null=func->maybe_null;
initid.const_item=const_item_cache;
initid.decimals=func->decimals;
initid.ptr=0;
if (u_d->func_init)
{
char *to=num_buffer;
for (uint i=0; i < arg_count; i++)
{
/*
For a constant argument i, args->args[i] points to the argument value.
For non-constant, args->args[i] is NULL.
*/
f_args.args[i]= NULL; /* Non-const unless updated below. */
f_args.lengths[i]= arguments[i]->max_length;
f_args.maybe_null[i]= (char) arguments[i]->maybe_null;
f_args.attributes[i]= arguments[i]->name;
f_args.attribute_lengths[i]= arguments[i]->name_length;
if (arguments[i]->const_item())
{
switch (arguments[i]->result_type())
{
case STRING_RESULT:
case DECIMAL_RESULT:
{
String *res= arguments[i]->val_str(&buffers[i]);
if (arguments[i]->null_value)
continue;
f_args.args[i]= (char*) res->c_ptr();
f_args.lengths[i]= res->length();
break;
}
case INT_RESULT:
*((longlong*) to)= arguments[i]->val_int();
if (arguments[i]->null_value)
continue;
f_args.args[i]= to;
to+= ALIGN_SIZE(sizeof(longlong));
break;
case REAL_RESULT:
*((double*) to)= arguments[i]->val_real();
if (arguments[i]->null_value)
continue;
f_args.args[i]= to;
to+= ALIGN_SIZE(sizeof(double));
break;
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
break;
}
}
}
thd->net.last_error[0]=0;
Udf_func_init init= u_d->func_init;
if ((error=(uchar) init(&initid, &f_args, thd->net.last_error)))
{
my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
u_d->name.str, thd->net.last_error);
free_udf(u_d);
DBUG_RETURN(TRUE);
}
func->max_length=min(initid.max_length,MAX_BLOB_WIDTH);
func->maybe_null=initid.maybe_null;
const_item_cache=initid.const_item;
func->decimals=min(initid.decimals,NOT_FIXED_DEC);
}
initialized=1;
if (error)
{
my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
u_d->name.str, ER(ER_UNKNOWN_ERROR));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
bool udf_handler::get_arguments()
{
if (error)
return 1; // Got an error earlier
char *to= num_buffer;
uint str_count=0;
for (uint i=0; i < f_args.arg_count; i++)
{
f_args.args[i]=0;
switch (f_args.arg_type[i]) {
case STRING_RESULT:
case DECIMAL_RESULT:
{
String *res=args[i]->val_str(&buffers[str_count++]);
if (!(args[i]->null_value))
{
f_args.args[i]= (char*) res->ptr();
f_args.lengths[i]= res->length();
break;
}
}
case INT_RESULT:
*((longlong*) to) = args[i]->val_int();
if (!args[i]->null_value)
{
f_args.args[i]=to;
to+= ALIGN_SIZE(sizeof(longlong));
}
break;
case REAL_RESULT:
*((double*) to)= args[i]->val_real();
if (!args[i]->null_value)
{
f_args.args[i]=to;
to+= ALIGN_SIZE(sizeof(double));
}
break;
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
break;
}
}
return 0;
}
/* This returns (String*) 0 in case of NULL values */
String *udf_handler::val_str(String *str,String *save_str)
{
uchar is_null_tmp=0;
ulong res_length;
DBUG_ENTER("udf_handler::val_str");
if (get_arguments())
DBUG_RETURN(0);
char * (*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
(char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
u_d->func;
if ((res_length=str->alloced_length()) < MAX_FIELD_WIDTH)
{ // This happens VERY seldom
if (str->alloc(MAX_FIELD_WIDTH))
{
error=1;
DBUG_RETURN(0);
}
}
char *res=func(&initid, &f_args, (char*) str->ptr(), &res_length,
&is_null_tmp, &error);
DBUG_PRINT("info", ("udf func returned, res_length: %lu", res_length));
if (is_null_tmp || !res || error) // The !res is for safety
{
DBUG_PRINT("info", ("Null or error"));
DBUG_RETURN(0);
}
if (res == str->ptr())
{
str->length(res_length);
DBUG_PRINT("exit", ("str: %s", str->ptr()));
DBUG_RETURN(str);
}
save_str->set(res, res_length, str->charset());
DBUG_PRINT("exit", ("save_str: %s", save_str->ptr()));
DBUG_RETURN(save_str);
}
/*
For the moment, UDF functions are returning DECIMAL values as strings
*/
my_decimal *udf_handler::val_decimal(my_bool *null_value, my_decimal *dec_buf)
{
char buf[DECIMAL_MAX_STR_LENGTH+1], *end;
ulong res_length= DECIMAL_MAX_STR_LENGTH;
if (get_arguments())
{
*null_value=1;
return 0;
}
char *(*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
(char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
u_d->func;
char *res= func(&initid, &f_args, buf, &res_length, &is_null, &error);
if (is_null || error)
{
*null_value= 1;
return 0;
}
end= res+ res_length;
str2my_decimal(E_DEC_FATAL_ERROR, res, dec_buf, &end);
return dec_buf;
}
void Item_udf_func::cleanup()
{
udf.cleanup();
Item_func::cleanup();
}
void Item_udf_func::print(String *str)
{
str->append(func_name());
str->append('(');
for (uint i=0 ; i < arg_count ; i++)
{
if (i != 0)
str->append(',');
args[i]->print_item_w_name(str);
}
str->append(')');
}
double Item_func_udf_float::val_real()
{
DBUG_ASSERT(fixed == 1);
DBUG_ENTER("Item_func_udf_float::val");
DBUG_PRINT("info",("result_type: %d arg_count: %d",
args[0]->result_type(), arg_count));
DBUG_RETURN(udf.val(&null_value));
}
String *Item_func_udf_float::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
double nr= val_real();
if (null_value)
return 0; /* purecov: inspected */
str->set_real(nr,decimals,&my_charset_bin);
return str;
}
longlong Item_func_udf_int::val_int()
{
DBUG_ASSERT(fixed == 1);
DBUG_ENTER("Item_func_udf_int::val_int");
DBUG_RETURN(udf.val_int(&null_value));
}
String *Item_func_udf_int::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
longlong nr=val_int();
if (null_value)
return 0;
str->set_int(nr, unsigned_flag, &my_charset_bin);
return str;
}
longlong Item_func_udf_decimal::val_int()
{
my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
longlong result;
if (null_value)
return 0;
my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
return result;
}
double Item_func_udf_decimal::val_real()
{
my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
double result;
if (null_value)
return 0.0;
my_decimal2double(E_DEC_FATAL_ERROR, dec, &result);
return result;
}
my_decimal *Item_func_udf_decimal::val_decimal(my_decimal *dec_buf)
{
DBUG_ASSERT(fixed == 1);
DBUG_ENTER("Item_func_udf_decimal::val_decimal");
DBUG_PRINT("info",("result_type: %d arg_count: %d",
args[0]->result_type(), arg_count));
DBUG_RETURN(udf.val_decimal(&null_value, dec_buf));
}
String *Item_func_udf_decimal::val_str(String *str)
{
my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
if (null_value)
return 0;
if (str->length() < DECIMAL_MAX_STR_LENGTH)
str->length(DECIMAL_MAX_STR_LENGTH);
my_decimal_round(E_DEC_FATAL_ERROR, dec, decimals, FALSE, &dec_buf);
my_decimal2string(E_DEC_FATAL_ERROR, &dec_buf, 0, 0, '0', str);
return str;
}
void Item_func_udf_decimal::fix_length_and_dec()
{
fix_num_length_and_dec();
}
/* Default max_length is max argument length */
void Item_func_udf_str::fix_length_and_dec()
{
DBUG_ENTER("Item_func_udf_str::fix_length_and_dec");
max_length=0;
for (uint i = 0; i < arg_count; i++)
set_if_bigger(max_length,args[i]->max_length);
DBUG_VOID_RETURN;
}
String *Item_func_udf_str::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
String *res=udf.val_str(str,&str_value);
null_value = !res;
return res;
}
/*
This has to come last in the udf_handler methods, or C for AIX
version 6.0.0.0 fails to compile with debugging enabled. (Yes, really.)
*/
udf_handler::~udf_handler()
{
/* Everything should be properly cleaned up by this moment. */
DBUG_ASSERT(not_original || !(initialized || buffers));
}
#else
bool udf_handler::get_arguments() { return 0; }
#endif /* HAVE_DLOPEN */
/*
** User level locks
*/
pthread_mutex_t LOCK_user_locks;
static HASH hash_user_locks;
class User_level_lock
{
uchar *key;
size_t key_length;
public:
int count;
bool locked;
pthread_cond_t cond;
my_thread_id thread_id;
void set_thread(THD *thd) { thread_id= thd->thread_id; }
User_level_lock(const uchar *key_arg,uint length, ulong id)
:key_length(length),count(1),locked(1), thread_id(id)
{
key= (uchar*) my_memdup(key_arg,length,MYF(0));
pthread_cond_init(&cond,NULL);
if (key)
{
if (my_hash_insert(&hash_user_locks,(uchar*) this))
{
my_free(key,MYF(0));
key=0;
}
}
}
~User_level_lock()
{
if (key)
{
hash_delete(&hash_user_locks,(uchar*) this);
my_free(key, MYF(0));
}
pthread_cond_destroy(&cond);
}
inline bool initialized() { return key != 0; }
friend void item_user_lock_release(User_level_lock *ull);
friend uchar *ull_get_key(const User_level_lock *ull, size_t *length,
my_bool not_used);
};
uchar *ull_get_key(const User_level_lock *ull, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= ull->key_length;
return ull->key;
}
static bool item_user_lock_inited= 0;
void item_user_lock_init(void)
{
pthread_mutex_init(&LOCK_user_locks,MY_MUTEX_INIT_SLOW);
hash_init(&hash_user_locks,system_charset_info,
16,0,0,(hash_get_key) ull_get_key,NULL,0);
item_user_lock_inited= 1;
}
void item_user_lock_free(void)
{
if (item_user_lock_inited)
{
item_user_lock_inited= 0;
hash_free(&hash_user_locks);
pthread_mutex_destroy(&LOCK_user_locks);
}
}
void item_user_lock_release(User_level_lock *ull)
{
ull->locked=0;
ull->thread_id= 0;
if (--ull->count)
pthread_cond_signal(&ull->cond);
else
delete ull;
}
/*
Wait until we are at or past the given position in the master binlog
on the slave
*/
longlong Item_master_pos_wait::val_int()
{
DBUG_ASSERT(fixed == 1);
THD* thd = current_thd;
String *log_name = args[0]->val_str(&value);
int event_count= 0;
null_value=0;
if (thd->slave_thread || !log_name || !log_name->length())
{
null_value = 1;
return 0;
}
#ifdef HAVE_REPLICATION
longlong pos = (ulong)args[1]->val_int();
longlong timeout = (arg_count==3) ? args[2]->val_int() : 0 ;
if ((event_count = active_mi->rli.wait_for_pos(thd, log_name, pos, timeout)) == -2)
{
null_value = 1;
event_count=0;
}
#endif
return event_count;
}
#ifdef EXTRA_DEBUG
void debug_sync_point(const char* lock_name, uint lock_timeout)
{
THD* thd=current_thd;
User_level_lock* ull;
struct timespec abstime;
size_t lock_name_len;
lock_name_len= strlen(lock_name);
pthread_mutex_lock(&LOCK_user_locks);
if (thd->ull)
{
item_user_lock_release(thd->ull);
thd->ull=0;
}
/*
If the lock has not been aquired by some client, we do not want to
create an entry for it, since we immediately release the lock. In
this case, we will not be waiting, but rather, just waste CPU and
memory on the whole deal
*/
if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks,
(uchar*) lock_name,
lock_name_len))))
{
pthread_mutex_unlock(&LOCK_user_locks);
return;
}
ull->count++;
/*
Structure is now initialized. Try to get the lock.
Set up control struct to allow others to abort locks
*/
thd->proc_info="User lock";
thd->mysys_var->current_mutex= &LOCK_user_locks;
thd->mysys_var->current_cond= &ull->cond;
set_timespec(abstime,lock_timeout);
while (ull->locked && !thd->killed)
{
int error= pthread_cond_timedwait(&ull->cond, &LOCK_user_locks, &abstime);
if (error == ETIMEDOUT || error == ETIME)
break;
}
if (ull->locked)
{
if (!--ull->count)
delete ull; // Should never happen
}
else
{
ull->locked=1;
ull->set_thread(thd);
thd->ull=ull;
}
pthread_mutex_unlock(&LOCK_user_locks);
pthread_mutex_lock(&thd->mysys_var->mutex);
thd->proc_info=0;
thd->mysys_var->current_mutex= 0;
thd->mysys_var->current_cond= 0;
pthread_mutex_unlock(&thd->mysys_var->mutex);
pthread_mutex_lock(&LOCK_user_locks);
if (thd->ull)
{
item_user_lock_release(thd->ull);
thd->ull=0;
}
pthread_mutex_unlock(&LOCK_user_locks);
}
#endif
/*
Get a user level lock. If the thread has an old lock this is first released.
Returns 1: Got lock
Returns 0: Timeout
Returns NULL: Error
*/
longlong Item_func_get_lock::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
longlong timeout=args[1]->val_int();
struct timespec abstime;
THD *thd=current_thd;
User_level_lock *ull;
int error;
DBUG_ENTER("Item_func_get_lock::val_int");
/*
In slave thread no need to get locks, everything is serialized. Anyway
there is no way to make GET_LOCK() work on slave like it did on master
(i.e. make it return exactly the same value) because we don't have the
same other concurrent threads environment. No matter what we return here,
it's not guaranteed to be same as on master.
*/
if (thd->slave_thread)
DBUG_RETURN(1);
pthread_mutex_lock(&LOCK_user_locks);
if (!res || !res->length())
{
pthread_mutex_unlock(&LOCK_user_locks);
null_value=1;
DBUG_RETURN(0);
}
DBUG_PRINT("info", ("lock %.*s, thd=%ld", res->length(), res->ptr(),
(long) thd->real_id));
null_value=0;
if (thd->ull)
{
item_user_lock_release(thd->ull);
thd->ull=0;
}
if (!(ull= ((User_level_lock *) hash_search(&hash_user_locks,
(uchar*) res->ptr(),
(size_t) res->length()))))
{
ull= new User_level_lock((uchar*) res->ptr(), (size_t) res->length(),
thd->thread_id);
if (!ull || !ull->initialized())
{
delete ull;
pthread_mutex_unlock(&LOCK_user_locks);
null_value=1; // Probably out of memory
DBUG_RETURN(0);
}
ull->set_thread(thd);
thd->ull=ull;
pthread_mutex_unlock(&LOCK_user_locks);
DBUG_PRINT("info", ("made new lock"));
DBUG_RETURN(1); // Got new lock
}
ull->count++;
DBUG_PRINT("info", ("ull->count=%d", ull->count));
/*
Structure is now initialized. Try to get the lock.
Set up control struct to allow others to abort locks.
*/
thd->proc_info="User lock";
thd->mysys_var->current_mutex= &LOCK_user_locks;
thd->mysys_var->current_cond= &ull->cond;
set_timespec(abstime,timeout);
error= 0;
while (ull->locked && !thd->killed)
{
DBUG_PRINT("info", ("waiting on lock"));
error= pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime);
if (error == ETIMEDOUT || error == ETIME)
{
DBUG_PRINT("info", ("lock wait timeout"));
break;
}
error= 0;
}
if (ull->locked)
{
if (!--ull->count)
{
DBUG_ASSERT(0);
delete ull; // Should never happen
}
if (!error) // Killed (thd->killed != 0)
{
error=1;
null_value=1; // Return NULL
}
}
else // We got the lock
{
ull->locked=1;
ull->set_thread(thd);
ull->thread_id= thd->thread_id;
thd->ull=ull;
error=0;
DBUG_PRINT("info", ("got the lock"));
}
pthread_mutex_unlock(&LOCK_user_locks);
pthread_mutex_lock(&thd->mysys_var->mutex);
thd->proc_info=0;
thd->mysys_var->current_mutex= 0;
thd->mysys_var->current_cond= 0;
pthread_mutex_unlock(&thd->mysys_var->mutex);
DBUG_RETURN(!error ? 1 : 0);
}
/*
Release a user level lock.
Return:
1 if lock released
0 if lock wasn't held
(SQL) NULL if no such lock
*/
longlong Item_func_release_lock::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
User_level_lock *ull;
longlong result;
THD *thd=current_thd;
DBUG_ENTER("Item_func_release_lock::val_int");
if (!res || !res->length())
{
null_value=1;
DBUG_RETURN(0);
}
DBUG_PRINT("info", ("lock %.*s", res->length(), res->ptr()));
null_value=0;
result=0;
pthread_mutex_lock(&LOCK_user_locks);
if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks,
(const uchar*) res->ptr(),
(size_t) res->length()))))
{
null_value=1;
}
else
{
DBUG_PRINT("info", ("ull->locked=%d ull->thread=%lu thd=%lu",
(int) ull->locked,
(long)ull->thread_id,
(long)thd->thread_id));
if (ull->locked && current_thd->thread_id == ull->thread_id)
{
DBUG_PRINT("info", ("release lock"));
result=1; // Release is ok
item_user_lock_release(ull);
thd->ull=0;
}
}
pthread_mutex_unlock(&LOCK_user_locks);
DBUG_RETURN(result);
}
longlong Item_func_last_insert_id::val_int()
{
THD *thd= current_thd;
DBUG_ASSERT(fixed == 1);
if (arg_count)
{
longlong value= args[0]->val_int();
null_value= args[0]->null_value;
/*
LAST_INSERT_ID(X) must affect the client's mysql_insert_id() as
documented in the manual. We don't want to touch
first_successful_insert_id_in_cur_stmt because it would make
LAST_INSERT_ID(X) take precedence over an generated auto_increment
value for this row.
*/
thd->arg_of_last_insert_id_function= TRUE;
thd->first_successful_insert_id_in_prev_stmt= value;
return value;
}
thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
return thd->read_first_successful_insert_id_in_prev_stmt();
}
/* This function is just used to test speed of different functions */
longlong Item_func_benchmark::val_int()
{
DBUG_ASSERT(fixed == 1);
char buff[MAX_FIELD_WIDTH];
String tmp(buff,sizeof(buff), &my_charset_bin);
my_decimal tmp_decimal;
THD *thd=current_thd;
ulong loop_count;
loop_count= (ulong) args[0]->val_int();
if (args[0]->null_value)
{
null_value= 1;
return 0;
}
null_value=0;
for (ulong loop=0 ; loop < loop_count && !thd->killed; loop++)
{
switch (args[1]->result_type()) {
case REAL_RESULT:
(void) args[1]->val_real();
break;
case INT_RESULT:
(void) args[1]->val_int();
break;
case STRING_RESULT:
(void) args[1]->val_str(&tmp);
break;
case DECIMAL_RESULT:
(void) args[1]->val_decimal(&tmp_decimal);
break;
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
return 0;
}
}
return 0;
}
void Item_func_benchmark::print(String *str)
{
str->append(STRING_WITH_LEN("benchmark("));
args[0]->print(str);
str->append(',');
args[1]->print(str);
str->append(')');
}
/* This function is just used to create tests with time gaps */
longlong Item_func_sleep::val_int()
{
THD *thd= current_thd;
struct timespec abstime;
pthread_cond_t cond;
int error;
DBUG_ASSERT(fixed == 1);
double time= args[0]->val_real();
set_timespec_nsec(abstime, (ulonglong)(time * ULL(1000000000)));
pthread_cond_init(&cond, NULL);
pthread_mutex_lock(&LOCK_user_locks);
thd->mysys_var->current_mutex= &LOCK_user_locks;
thd->mysys_var->current_cond= &cond;
error= 0;
while (!thd->killed)
{
error= pthread_cond_timedwait(&cond, &LOCK_user_locks, &abstime);
if (error == ETIMEDOUT || error == ETIME)
break;
error= 0;
}
pthread_mutex_lock(&thd->mysys_var->mutex);
thd->mysys_var->current_mutex= 0;
thd->mysys_var->current_cond= 0;
pthread_mutex_unlock(&thd->mysys_var->mutex);
pthread_mutex_unlock(&LOCK_user_locks);
pthread_cond_destroy(&cond);
return test(!error); // Return 1 killed
}
#define extra_size sizeof(double)
static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
bool create_if_not_exists)
{
user_var_entry *entry;
if (!(entry = (user_var_entry*) hash_search(hash, (uchar*) name.str,
name.length)) &&
create_if_not_exists)
{
uint size=ALIGN_SIZE(sizeof(user_var_entry))+name.length+1+extra_size;
if (!hash_inited(hash))
return 0;
if (!(entry = (user_var_entry*) my_malloc(size,MYF(MY_WME))))
return 0;
entry->name.str=(char*) entry+ ALIGN_SIZE(sizeof(user_var_entry))+
extra_size;
entry->name.length=name.length;
entry->value=0;
entry->length=0;
entry->update_query_id=0;
entry->collation.set(NULL, DERIVATION_IMPLICIT, 0);
entry->unsigned_flag= 0;
/*
If we are here, we were called from a SET or a query which sets a
variable. Imagine it is this:
INSERT INTO t SELECT @a:=10, @a:=@a+1.
Then when we have a Item_func_get_user_var (because of the @a+1) so we
think we have to write the value of @a to the binlog. But before that,
we have a Item_func_set_user_var to create @a (@a:=10), in this we mark
the variable as "already logged" (line below) so that it won't be logged
by Item_func_get_user_var (because that's not necessary).
*/
entry->used_query_id=current_thd->query_id;
entry->type=STRING_RESULT;
memcpy(entry->name.str, name.str, name.length+1);
if (my_hash_insert(hash,(uchar*) entry))
{
my_free((char*) entry,MYF(0));
return 0;
}
}
return entry;
}
/*
When a user variable is updated (in a SET command or a query like
SELECT @a:= ).
*/
bool Item_func_set_user_var::fix_fields(THD *thd, Item **ref)
{
DBUG_ASSERT(fixed == 0);
/* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
if (Item_func::fix_fields(thd, ref) ||
!(entry= get_variable(&thd->user_vars, name, 1)))
return TRUE;
/*
Remember the last query which updated it, this way a query can later know
if this variable is a constant item in the query (it is if update_query_id
is different from query_id).
*/
entry->update_query_id= thd->query_id;
/*
As it is wrong and confusing to associate any
character set with NULL, @a should be latin2
after this query sequence:
SET @a=_latin2'string';
SET @a=NULL;
I.e. the second query should not change the charset
to the current default value, but should keep the
original value assigned during the first query.
In order to do it, we don't copy charset
from the argument if the argument is NULL
and the variable has previously been initialized.
*/
null_item= (args[0]->type() == NULL_ITEM);
if (!entry->collation.collation || !null_item)
entry->collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
collation.set(entry->collation.collation, DERIVATION_IMPLICIT);
cached_result_type= args[0]->result_type();
return FALSE;
}
void
Item_func_set_user_var::fix_length_and_dec()
{
maybe_null=args[0]->maybe_null;
max_length=args[0]->max_length;
decimals=args[0]->decimals;
collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
}
/*
Mark field in read_map
NOTES
This is used by filesort to register used fields in a a temporary
column read set or to register used fields in a view
*/
bool Item_func_set_user_var::register_field_in_read_map(uchar *arg)
{
TABLE *table= (TABLE *) arg;
if (result_field->table == table || !table)
bitmap_set_bit(result_field->table->read_set, result_field->field_index);
return 0;
}
/*
Set value to user variable.
SYNOPSYS
update_hash()
entry - pointer to structure representing variable
set_null - should we set NULL value ?
ptr - pointer to buffer with new value
length - length of new value
type - type of new value
cs - charset info for new value
dv - derivation for new value
unsigned_arg - indiates if a value of type INT_RESULT is unsigned
RETURN VALUE
False - success, True - failure
*/
static bool
update_hash(user_var_entry *entry, bool set_null, void *ptr, uint length,
Item_result type, CHARSET_INFO *cs, Derivation dv,
bool unsigned_arg)
{
if (set_null)
{
char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
if (entry->value && entry->value != pos)
my_free(entry->value,MYF(0));
entry->value= 0;
entry->length= 0;
}
else
{
if (type == STRING_RESULT)
length++; // Store strings with end \0
if (length <= extra_size)
{
/* Save value in value struct */
char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
if (entry->value != pos)
{
if (entry->value)
my_free(entry->value,MYF(0));
entry->value=pos;
}
}
else
{
/* Allocate variable */
if (entry->length != length)
{
char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
if (entry->value == pos)
entry->value=0;
entry->value= (char*) my_realloc(entry->value, length,
MYF(MY_ALLOW_ZERO_PTR | MY_WME));
if (!entry->value)
return 1;
}
}
if (type == STRING_RESULT)
{
length--; // Fix length change above
entry->value[length]= 0; // Store end \0
}
memcpy(entry->value,ptr,length);
if (type == DECIMAL_RESULT)
((my_decimal*)entry->value)->fix_buffer_pointer();
entry->length= length;
entry->collation.set(cs, dv);
entry->unsigned_flag= unsigned_arg;
}
entry->type=type;
return 0;
}
bool
Item_func_set_user_var::update_hash(void *ptr, uint length,
Item_result res_type,
CHARSET_INFO *cs, Derivation dv,
bool unsigned_arg)
{
/*
If we set a variable explicitely to NULL then keep the old
result type of the variable
*/
if ((null_value= args[0]->null_value) && null_item)
res_type= entry->type; // Don't change type of item
if (::update_hash(entry, (null_value= args[0]->null_value),
ptr, length, res_type, cs, dv, unsigned_arg))
{
current_thd->fatal_error(); // Probably end of memory
null_value= 1;
return 1;
}
return 0;
}
/* Get the value of a variable as a double */
double user_var_entry::val_real(my_bool *null_value)
{
if ((*null_value= (value == 0)))
return 0.0;
switch (type) {
case REAL_RESULT:
return *(double*) value;
case INT_RESULT:
return (double) *(longlong*) value;
case DECIMAL_RESULT:
{
double result;
my_decimal2double(E_DEC_FATAL_ERROR, (my_decimal *)value, &result);
return result;
}
case STRING_RESULT:
return my_atof(value); // This is null terminated
case ROW_RESULT:
DBUG_ASSERT(1); // Impossible
break;
}
return 0.0; // Impossible
}
/* Get the value of a variable as an integer */
longlong user_var_entry::val_int(my_bool *null_value)
{
if ((*null_value= (value == 0)))
return LL(0);
switch (type) {
case REAL_RESULT:
return (longlong) *(double*) value;
case INT_RESULT:
return *(longlong*) value;
case DECIMAL_RESULT:
{
longlong result;
my_decimal2int(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, &result);
return result;
}
case STRING_RESULT:
{
int error;
return my_strtoll10(value, (char**) 0, &error);// String is null terminated
}
case ROW_RESULT:
DBUG_ASSERT(1); // Impossible
break;
}
return LL(0); // Impossible
}
/* Get the value of a variable as a string */
String *user_var_entry::val_str(my_bool *null_value, String *str,
uint decimals)
{
if ((*null_value= (value == 0)))
return (String*) 0;
switch (type) {
case REAL_RESULT:
str->set_real(*(double*) value, decimals, &my_charset_bin);
break;
case INT_RESULT:
if (!unsigned_flag)
str->set(*(longlong*) value, &my_charset_bin);
else
str->set(*(ulonglong*) value, &my_charset_bin);
break;
case DECIMAL_RESULT:
my_decimal2string(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, 0, 0, str);
break;
case STRING_RESULT:
if (str->copy(value, length, collation.collation))
str= 0; // EOM error
case ROW_RESULT:
DBUG_ASSERT(1); // Impossible
break;
}
return(str);
}
/* Get the value of a variable as a decimal */
my_decimal *user_var_entry::val_decimal(my_bool *null_value, my_decimal *val)
{
if ((*null_value= (value == 0)))
return 0;
switch (type) {
case REAL_RESULT:
double2my_decimal(E_DEC_FATAL_ERROR, *(double*) value, val);
break;
case INT_RESULT:
int2my_decimal(E_DEC_FATAL_ERROR, *(longlong*) value, 0, val);
break;
case DECIMAL_RESULT:
val= (my_decimal *)value;
break;
case STRING_RESULT:
str2my_decimal(E_DEC_FATAL_ERROR, value, length, collation.collation, val);
break;
case ROW_RESULT:
DBUG_ASSERT(1); // Impossible
break;
}
return(val);
}
/*
This functions is invoked on SET @variable or @variable:= expression.
Evaluate (and check expression), store results.
SYNOPSYS
Item_func_set_user_var::check()
NOTES
For now it always return OK. All problem with value evaluating
will be caught by thd->net.report_error check in sql_set_variables().
RETURN
FALSE OK.
*/
bool
Item_func_set_user_var::check(bool use_result_field)
{
DBUG_ENTER("Item_func_set_user_var::check");
if (use_result_field && !result_field)
use_result_field= FALSE;
switch (cached_result_type) {
case REAL_RESULT:
{
save_result.vreal= use_result_field ? result_field->val_real() :
args[0]->val_real();
break;
}
case INT_RESULT:
{
save_result.vint= use_result_field ? result_field->val_int() :
args[0]->val_int();
unsigned_flag= use_result_field ? ((Field_num*)result_field)->unsigned_flag:
args[0]->unsigned_flag;
break;
}
case STRING_RESULT:
{
save_result.vstr= use_result_field ? result_field->val_str(&value) :
args[0]->val_str(&value);
break;
}
case DECIMAL_RESULT:
{
save_result.vdec= use_result_field ?
result_field->val_decimal(&decimal_buff) :
args[0]->val_decimal(&decimal_buff);
break;
}
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
break;
}
DBUG_RETURN(FALSE);
}
/*
This functions is invoked on SET @variable or @variable:= expression.
SYNOPSIS
Item_func_set_user_var::update()
NOTES
We have to store the expression as such in the variable, independent of
the value method used by the user
RETURN
0 OK
1 EOM Error
*/
bool
Item_func_set_user_var::update()
{
bool res;
DBUG_ENTER("Item_func_set_user_var::update");
LINT_INIT(res);
switch (cached_result_type) {
case REAL_RESULT:
{
res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT, 0);
break;
}
case INT_RESULT:
{
res= update_hash((void*) &save_result.vint, sizeof(save_result.vint),
INT_RESULT, &my_charset_bin, DERIVATION_IMPLICIT,
unsigned_flag);
break;
}
case STRING_RESULT:
{
if (!save_result.vstr) // Null value
res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
DERIVATION_IMPLICIT, 0);
else
res= update_hash((void*) save_result.vstr->ptr(),
save_result.vstr->length(), STRING_RESULT,
save_result.vstr->charset(),
DERIVATION_IMPLICIT, 0);
break;
}
case DECIMAL_RESULT:
{
if (!save_result.vdec) // Null value
res= update_hash((void*) 0, 0, DECIMAL_RESULT, &my_charset_bin,
DERIVATION_IMPLICIT, 0);
else
res= update_hash((void*) save_result.vdec,
sizeof(my_decimal), DECIMAL_RESULT,
&my_charset_bin, DERIVATION_IMPLICIT, 0);
break;
}
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
break;
}
DBUG_RETURN(res);
}
double Item_func_set_user_var::val_real()
{
DBUG_ASSERT(fixed == 1);
check(0);
update(); // Store expression
return entry->val_real(&null_value);
}
longlong Item_func_set_user_var::val_int()
{
DBUG_ASSERT(fixed == 1);
check(0);
update(); // Store expression
return entry->val_int(&null_value);
}
String *Item_func_set_user_var::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
check(0);
update(); // Store expression
return entry->val_str(&null_value, str, decimals);
}
my_decimal *Item_func_set_user_var::val_decimal(my_decimal *val)
{
DBUG_ASSERT(fixed == 1);
check(0);
update(); // Store expression
return entry->val_decimal(&null_value, val);
}
double Item_func_set_user_var::val_result()
{
DBUG_ASSERT(fixed == 1);
check(TRUE);
update(); // Store expression
return entry->val_real(&null_value);
}
longlong Item_func_set_user_var::val_int_result()
{
DBUG_ASSERT(fixed == 1);
check(TRUE);
update(); // Store expression
return entry->val_int(&null_value);
}
String *Item_func_set_user_var::str_result(String *str)
{
DBUG_ASSERT(fixed == 1);
check(TRUE);
update(); // Store expression
return entry->val_str(&null_value, str, decimals);
}
my_decimal *Item_func_set_user_var::val_decimal_result(my_decimal *val)
{
DBUG_ASSERT(fixed == 1);
check(TRUE);
update(); // Store expression
return entry->val_decimal(&null_value, val);
}
void Item_func_set_user_var::print(String *str)
{
str->append(STRING_WITH_LEN("(@"));
str->append(name.str, name.length);
str->append(STRING_WITH_LEN(":="));
args[0]->print(str);
str->append(')');
}
void Item_func_set_user_var::print_as_stmt(String *str)
{
str->append(STRING_WITH_LEN("set @"));
str->append(name.str, name.length);
str->append(STRING_WITH_LEN(":="));
args[0]->print(str);
str->append(')');
}
bool Item_func_set_user_var::send(Protocol *protocol, String *str_arg)
{
if (result_field)
{
check(1);
update();
return protocol->store(result_field);
}
return Item::send(protocol, str_arg);
}
void Item_func_set_user_var::make_field(Send_field *tmp_field)
{
if (result_field)
{
result_field->make_field(tmp_field);
DBUG_ASSERT(tmp_field->table_name != 0);
if (Item::name)
tmp_field->col_name=Item::name; // Use user supplied name
}
else
Item::make_field(tmp_field);
}
/*
Save the value of a user variable into a field
SYNOPSIS
save_in_field()
field target field to save the value to
no_conversion flag indicating whether conversions are allowed
DESCRIPTION
Save the function value into a field and update the user variable
accordingly. If a result field is defined and the target field doesn't
coincide with it then the value from the result field will be used as
the new value of the user variable.
The reason to have this method rather than simply using the result
field in the val_xxx() methods is that the value from the result field
not always can be used when the result field is defined.
Let's consider the following cases:
1) when filling a tmp table the result field is defined but the value of it
is undefined because it has to be produced yet. Thus we can't use it.
2) on execution of an INSERT ... SELECT statement the save_in_field()
function will be called to fill the data in the new record. If the SELECT
part uses a tmp table then the result field is defined and should be
used in order to get the correct result.
The difference between the SET_USER_VAR function and regular functions
like CONCAT is that the Item_func objects for the regular functions are
replaced by Item_field objects after the values of these functions have
been stored in a tmp table. Yet an object of the Item_field class cannot
be used to update a user variable.
Due to this we have to handle the result field in a special way here and
in the Item_func_set_user_var::send() function.
RETURN VALUES
FALSE Ok
TRUE Error
*/
int Item_func_set_user_var::save_in_field(Field *field, bool no_conversions,
bool can_use_result_field)
{
bool use_result_field= (!can_use_result_field ? 0 :
(result_field && result_field != field));
int error;
/* Update the value of the user variable */
check(use_result_field);
update();
if (result_type() == STRING_RESULT ||
result_type() == REAL_RESULT &&
field->result_type() == STRING_RESULT)
{
String *result;
CHARSET_INFO *cs= collation.collation;
char buff[MAX_FIELD_WIDTH]; // Alloc buffer for small columns
str_value.set_quick(buff, sizeof(buff), cs);
result= entry->val_str(&null_value, &str_value, decimals);
if (null_value)
{
str_value.set_quick(0, 0, cs);
return set_field_to_null_with_conversions(field, no_conversions);
}
/* NOTE: If null_value == FALSE, "result" must be not NULL. */
field->set_notnull();
error=field->store(result->ptr(),result->length(),cs);
str_value.set_quick(0, 0, cs);
}
else if (result_type() == REAL_RESULT)
{
double nr= entry->val_real(&null_value);
if (null_value)
return set_field_to_null(field);
field->set_notnull();
error=field->store(nr);
}
else if (result_type() == DECIMAL_RESULT)
{
my_decimal decimal_value;
my_decimal *val= entry->val_decimal(&null_value, &decimal_value);
if (null_value)
return set_field_to_null(field);
field->set_notnull();
error=field->store_decimal(val);
}
else
{
longlong nr= entry->val_int(&null_value);
if (null_value)
return set_field_to_null_with_conversions(field, no_conversions);
field->set_notnull();
error=field->store(nr, unsigned_flag);
}
return error;
}
String *
Item_func_get_user_var::val_str(String *str)
{
DBUG_ASSERT(fixed == 1);
DBUG_ENTER("Item_func_get_user_var::val_str");
if (!var_entry)
DBUG_RETURN((String*) 0); // No such variable
DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
}
double Item_func_get_user_var::val_real()
{
DBUG_ASSERT(fixed == 1);
if (!var_entry)
return 0.0; // No such variable
return (var_entry->val_real(&null_value));
}
my_decimal *Item_func_get_user_var::val_decimal(my_decimal *dec)
{
DBUG_ASSERT(fixed == 1);
if (!var_entry)
return 0;
return var_entry->val_decimal(&null_value, dec);
}
longlong Item_func_get_user_var::val_int()
{
DBUG_ASSERT(fixed == 1);
if (!var_entry)
return LL(0); // No such variable
return (var_entry->val_int(&null_value));
}
/*
Get variable by name and, if necessary, put the record of variable
use into the binary log.
SYNOPSIS
get_var_with_binlog()
thd Current thread
name Variable name
out_entry [out] variable structure or NULL. The pointer is set
regardless of whether function succeeded or not.
When a user variable is invoked from an update query (INSERT, UPDATE etc),
stores this variable and its value in thd->user_var_events, so that it can be
written to the binlog (will be written just before the query is written, see
log.cc).
RETURN
0 OK
1 Failed to put appropriate record into binary log
*/
int get_var_with_binlog(THD *thd, enum_sql_command sql_command,
LEX_STRING &name, user_var_entry **out_entry)
{
BINLOG_USER_VAR_EVENT *user_var_event;
user_var_entry *var_entry;
var_entry= get_variable(&thd->user_vars, name, 0);
/*
Any reference to user-defined variable which is done from stored
function or trigger affects their execution and the execution of the
calling statement. We must log all such variables even if they are
not involved in table-updating statements.
*/
if (!(opt_bin_log &&
(is_update_query(sql_command) || thd->in_sub_stmt)))
{
*out_entry= var_entry;
return 0;
}
if (!var_entry)
{
/*
If the variable does not exist, it's NULL, but we want to create it so
that it gets into the binlog (if it didn't, the slave could be
influenced by a variable of the same name previously set by another
thread).
We create it like if it had been explicitly set with SET before.
The 'new' mimics what sql_yacc.yy does when 'SET @a=10;'.
sql_set_variables() is what is called from 'case SQLCOM_SET_OPTION'
in dispatch_command()). Instead of building a one-element list to pass to
sql_set_variables(), we could instead manually call check() and update();
this would save memory and time; but calling sql_set_variables() makes
one unique place to maintain (sql_set_variables()).
Manipulation with lex is necessary since free_underlaid_joins
is going to release memory belonging to the main query.
*/
List<set_var_base> tmp_var_list;
LEX *sav_lex= thd->lex, lex_tmp;
thd->lex= &lex_tmp;
lex_start(thd);
tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
new Item_null())));
/* Create the variable */
if (sql_set_variables(thd, &tmp_var_list))
{
thd->lex= sav_lex;
goto err;
}
thd->lex= sav_lex;
if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
goto err;
}
else if (var_entry->used_query_id == thd->query_id ||
mysql_bin_log.is_query_in_union(thd, var_entry->used_query_id))
{
/*
If this variable was already stored in user_var_events by this query
(because it's used in more than one place in the query), don't store
it.
*/
*out_entry= var_entry;
return 0;
}
uint size;
/*
First we need to store value of var_entry, when the next situation
appears:
> set @a:=1;
> insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
We have to write to binlog value @a= 1.
We allocate the user_var_event on user_var_events_alloc pool, not on
the this-statement-execution pool because in SPs user_var_event objects
may need to be valid after current [SP] statement execution pool is
destroyed.
*/
size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;
if (!(user_var_event= (BINLOG_USER_VAR_EVENT *)
alloc_root(thd->user_var_events_alloc, size)))
goto err;
user_var_event->value= (char*) user_var_event +
ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT));
user_var_event->user_var_event= var_entry;
user_var_event->type= var_entry->type;
user_var_event->charset_number= var_entry->collation.collation->number;
if (!var_entry->value)
{
/* NULL value*/
user_var_event->length= 0;
user_var_event->value= 0;
}
else
{
user_var_event->length= var_entry->length;
memcpy(user_var_event->value, var_entry->value,
var_entry->length);
}
/* Mark that this variable has been used by this query */
var_entry->used_query_id= thd->query_id;
if (insert_dynamic(&thd->user_var_events, (uchar*) &user_var_event))
goto err;
*out_entry= var_entry;
return 0;
err:
*out_entry= var_entry;
return 1;
}
void Item_func_get_user_var::fix_length_and_dec()
{
THD *thd=current_thd;
int error;
maybe_null=1;
decimals=NOT_FIXED_DEC;
max_length=MAX_BLOB_WIDTH;
error= get_var_with_binlog(thd, thd->lex->sql_command, name, &var_entry);
/*
If the variable didn't exist it has been created as a STRING-type.
'var_entry' is NULL only if there occured an error during the call to
get_var_with_binlog.
*/
if (var_entry)
{
m_cached_result_type= var_entry->type;
unsigned_flag= var_entry->unsigned_flag;
max_length= var_entry->length;
collation.set(var_entry->collation);
switch(m_cached_result_type) {
case REAL_RESULT:
max_length= DBL_DIG + 8;
break;
case INT_RESULT:
max_length= MAX_BIGINT_WIDTH;
decimals=0;
break;
case STRING_RESULT:
max_length= MAX_BLOB_WIDTH;
break;
case DECIMAL_RESULT:
max_length= DECIMAL_MAX_STR_LENGTH;
decimals= DECIMAL_MAX_SCALE;
break;
case ROW_RESULT: // Keep compiler happy
default:
DBUG_ASSERT(0);
break;
}
}
else
{
collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
null_value= 1;
m_cached_result_type= STRING_RESULT;
max_length= MAX_BLOB_WIDTH;
}
if (error)
thd->fatal_error();
return;
}
bool Item_func_get_user_var::const_item() const
{
return (!var_entry || current_thd->query_id != var_entry->update_query_id);
}
enum Item_result Item_func_get_user_var::result_type() const
{
return m_cached_result_type;
}
void Item_func_get_user_var::print(String *str)
{
str->append(STRING_WITH_LEN("(@"));
str->append(name.str,name.length);
str->append(')');
}
bool Item_func_get_user_var::eq(const Item *item, bool binary_cmp) const
{
/* Assume we don't have rtti */
if (this == item)
return 1; // Same item is same.
/* Check if other type is also a get_user_var() object */
if (item->type() != FUNC_ITEM ||
((Item_func*) item)->functype() != functype())
return 0;
Item_func_get_user_var *other=(Item_func_get_user_var*) item;
return (name.length == other->name.length &&
!memcmp(name.str, other->name.str, name.length));
}
bool Item_func_get_user_var::set_value(THD *thd,
sp_rcontext * /*ctx*/, Item **it)
{
Item_func_set_user_var *suv= new Item_func_set_user_var(get_name(), *it);
/*
Item_func_set_user_var is not fixed after construction, call
fix_fields().
*/
return (!suv || suv->fix_fields(thd, it) || suv->check(0) || suv->update());
}
bool Item_user_var_as_out_param::fix_fields(THD *thd, Item **ref)
{
DBUG_ASSERT(fixed == 0);
if (Item::fix_fields(thd, ref) ||
!(entry= get_variable(&thd->user_vars, name, 1)))
return TRUE;
entry->type= STRING_RESULT;
/*
Let us set the same collation which is used for loading
of fields in LOAD DATA INFILE.
(Since Item_user_var_as_out_param is used only there).
*/
entry->collation.set(thd->variables.collation_database);
entry->update_query_id= thd->query_id;
return FALSE;
}
void Item_user_var_as_out_param::set_null_value(CHARSET_INFO* cs)
{
if (::update_hash(entry, TRUE, 0, 0, STRING_RESULT, cs,
DERIVATION_IMPLICIT, 0 /* unsigned_arg */))
current_thd->fatal_error(); // Probably end of memory
}
void Item_user_var_as_out_param::set_value(const char *str, uint length,
CHARSET_INFO* cs)
{
if (::update_hash(entry, FALSE, (void*)str, length, STRING_RESULT, cs,
DERIVATION_IMPLICIT, 0 /* unsigned_arg */))
current_thd->fatal_error(); // Probably end of memory
}
double Item_user_var_as_out_param::val_real()
{
DBUG_ASSERT(0);
return 0.0;
}
longlong Item_user_var_as_out_param::val_int()
{
DBUG_ASSERT(0);
return 0;
}
String* Item_user_var_as_out_param::val_str(String *str)
{
DBUG_ASSERT(0);
return 0;
}
my_decimal* Item_user_var_as_out_param::val_decimal(my_decimal *decimal_buffer)
{
DBUG_ASSERT(0);
return 0;
}
void Item_user_var_as_out_param::print(String *str)
{
str->append('@');
str->append(name.str,name.length);
}
Item_func_get_system_var::
Item_func_get_system_var(sys_var *var_arg, enum_var_type var_type_arg,
LEX_STRING *component_arg, const char *name_arg,
size_t name_len_arg)
:var(var_arg), var_type(var_type_arg), component(*component_arg)
{
/* set_name() will allocate the name */
set_name(name_arg, name_len_arg, system_charset_info);
}
bool
Item_func_get_system_var::fix_fields(THD *thd, Item **ref)
{
Item *item;
DBUG_ENTER("Item_func_get_system_var::fix_fields");
/*
Evaluate the system variable and substitute the result (a basic constant)
instead of this item. If the variable can not be evaluated,
the error is reported in sys_var::item().
*/
if (!(item= var->item(thd, var_type, &component)))
DBUG_RETURN(1); // Impossible
item->set_name(name, 0, system_charset_info); // don't allocate a new name
thd->change_item_tree(ref, item);
DBUG_RETURN(0);
}
longlong Item_func_inet_aton::val_int()
{
DBUG_ASSERT(fixed == 1);
uint byte_result = 0;
ulonglong result = 0; // We are ready for 64 bit addresses
const char *p,* end;
char c = '.'; // we mark c to indicate invalid IP in case length is 0
char buff[36];
int dot_count= 0;
String *s,tmp(buff,sizeof(buff),&my_charset_bin);
if (!(s = args[0]->val_str(&tmp))) // If null value
goto err;
null_value=0;
end= (p = s->ptr()) + s->length();
while (p < end)
{
c = *p++;
int digit = (int) (c - '0'); // Assume ascii
if (digit >= 0 && digit <= 9)
{
if ((byte_result = byte_result * 10 + digit) > 255)
goto err; // Wrong address
}
else if (c == '.')
{
dot_count++;
result= (result << 8) + (ulonglong) byte_result;
byte_result = 0;
}
else
goto err; // Invalid character
}
if (c != '.') // IP number can't end on '.'
{
/*
Handle short-forms addresses according to standard. Examples:
127 -> 0.0.0.127
127.1 -> 127.0.0.1
127.2.1 -> 127.2.0.1
*/
switch (dot_count) {
case 1: result<<= 8; /* Fall through */
case 2: result<<= 8; /* Fall through */
}
return (result << 8) + (ulonglong) byte_result;
}
err:
null_value=1;
return 0;
}
void Item_func_match::init_search(bool no_order)
{
DBUG_ENTER("Item_func_match::init_search");
/* Check if init_search() has been called before */
if (ft_handler)
DBUG_VOID_RETURN;
if (key == NO_SUCH_KEY)
{
List<Item> fields;
fields.push_back(new Item_string(" ",1, cmp_collation.collation));
for (uint i=1; i < arg_count; i++)
fields.push_back(args[i]);
concat_ws=new Item_func_concat_ws(fields);
/*
Above function used only to get value and do not need fix_fields for it:
Item_string - basic constant
fields - fix_fields() was already called for this arguments
Item_func_concat_ws - do not need fix_fields() to produce value
*/
concat_ws->quick_fix_field();
}
if (master)
{
join_key=master->join_key=join_key|master->join_key;
master->init_search(no_order);
ft_handler=master->ft_handler;
join_key=master->join_key;
DBUG_VOID_RETURN;
}
String *ft_tmp= 0;
// MATCH ... AGAINST (NULL) is meaningless, but possible
if (!(ft_tmp=key_item()->val_str(&value)))
{
ft_tmp= &value;
value.set("",0,cmp_collation.collation);
}
if (ft_tmp->charset() != cmp_collation.collation)
{
uint dummy_errors;
search_value.copy(ft_tmp->ptr(), ft_tmp->length(), ft_tmp->charset(),
cmp_collation.collation, &dummy_errors);
ft_tmp= &search_value;
}
if (join_key && !no_order)
flags|=FT_SORTED;
ft_handler=table->file->ft_init_ext(flags, key, ft_tmp);
if (join_key)
table->file->ft_handler=ft_handler;
DBUG_VOID_RETURN;
}
bool Item_func_match::fix_fields(THD *thd, Item **ref)
{
DBUG_ASSERT(fixed == 0);
Item *item;
LINT_INIT(item); // Safe as arg_count is > 1
maybe_null=1;
join_key=0;
/*
const_item is assumed in quite a bit of places, so it would be difficult
to remove; If it would ever to be removed, this should include
modifications to find_best and auto_close as complement to auto_init code
above.
*/
if (Item_func::fix_fields(thd, ref) ||
!args[0]->const_during_execution())
{
my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
return TRUE;
}
const_item_cache=0;
for (uint i=1 ; i < arg_count ; i++)
{
item=args[i];
if (item->type() == Item::REF_ITEM)
args[i]= item= *((Item_ref *)item)->ref;
if (item->type() != Item::FIELD_ITEM)
key=NO_SUCH_KEY;
}
/*
Check that all columns come from the same table.
We've already checked that columns in MATCH are fields so
PARAM_TABLE_BIT can only appear from AGAINST argument.
*/
if ((used_tables_cache & ~PARAM_TABLE_BIT) != item->used_tables())
key=NO_SUCH_KEY;
if (key == NO_SUCH_KEY && !(flags & FT_BOOL))
{
my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
return TRUE;
}
table=((Item_field *)item)->field->table;
if (!(table->file->ha_table_flags() & HA_CAN_FULLTEXT))
{
my_error(ER_TABLE_CANT_HANDLE_FT, MYF(0));
return 1;
}
table->fulltext_searched=1;
return agg_arg_collations_for_comparison(cmp_collation,
args+1, arg_count-1, 0);
}
bool Item_func_match::fix_index()
{
Item_field *item;
uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
uint max_cnt=0, mkeys=0, i;
if (key == NO_SUCH_KEY)
return 0;
if (!table)
goto err;
for (keynr=0 ; keynr < table->s->keys ; keynr++)
{
if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
(table->s->keys_in_use.is_set(keynr)))
{
ft_to_key[fts]=keynr;
ft_cnt[fts]=0;
fts++;
}
}
if (!fts)
goto err;
for (i=1; i < arg_count; i++)
{
item=(Item_field*)args[i];
for (keynr=0 ; keynr < fts ; keynr++)
{
KEY *ft_key=&table->key_info[ft_to_key[keynr]];
uint key_parts=ft_key->key_parts;
for (uint part=0 ; part < key_parts ; part++)
{
if (item->field->eq(ft_key->key_part[part].field))
ft_cnt[keynr]++;
}
}
}
for (keynr=0 ; keynr < fts ; keynr++)
{
if (ft_cnt[keynr] > max_cnt)
{
mkeys=0;
max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
ft_to_key[mkeys]=ft_to_key[keynr];
continue;
}
if (max_cnt && ft_cnt[keynr] == max_cnt)
{
mkeys++;
ft_cnt[mkeys]=ft_cnt[keynr];
ft_to_key[mkeys]=ft_to_key[keynr];
continue;
}
}
for (keynr=0 ; keynr <= mkeys ; keynr++)
{
// partial keys doesn't work
if (max_cnt < arg_count-1 ||
max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
continue;
key=ft_to_key[keynr];
return 0;
}
err:
if (flags & FT_BOOL)
{
key=NO_SUCH_KEY;
return 0;
}
my_message(ER_FT_MATCHING_KEY_NOT_FOUND,
ER(ER_FT_MATCHING_KEY_NOT_FOUND), MYF(0));
return 1;
}
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
{
if (item->type() != FUNC_ITEM ||
((Item_func*)item)->functype() != FT_FUNC ||
flags != ((Item_func_match*)item)->flags)
return 0;
Item_func_match *ifm=(Item_func_match*) item;
if (key == ifm->key && table == ifm->table &&
key_item()->eq(ifm->key_item(), binary_cmp))
return 1;
return 0;
}
double Item_func_match::val_real()
{
DBUG_ASSERT(fixed == 1);
DBUG_ENTER("Item_func_match::val");
if (ft_handler == NULL)
DBUG_RETURN(-1.0);
if (key != NO_SUCH_KEY && table->null_row) /* NULL row from an outer join */
DBUG_RETURN(0.0);
if (join_key)
{
if (table->file->ft_handler)
DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
join_key=0;
}
if (key == NO_SUCH_KEY)
{
String *a= concat_ws->val_str(&value);
if ((null_value= (a == 0)) || !a->length())
DBUG_RETURN(0);
DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
(uchar *)a->ptr(), a->length()));
}
DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
table->record[0], 0));
}
void Item_func_match::print(String *str)
{
str->append(STRING_WITH_LEN("(match "));
print_args(str, 1);
str->append(STRING_WITH_LEN(" against ("));
args[0]->print(str);
if (flags & FT_BOOL)
str->append(STRING_WITH_LEN(" in boolean mode"));
else if (flags & FT_EXPAND)
str->append(STRING_WITH_LEN(" with query expansion"));
str->append(STRING_WITH_LEN("))"));
}
longlong Item_func_bit_xor::val_int()
{
DBUG_ASSERT(fixed == 1);
ulonglong arg1= (ulonglong) args[0]->val_int();
ulonglong arg2= (ulonglong) args[1]->val_int();
if ((null_value= (args[0]->null_value || args[1]->null_value)))
return 0;
return (longlong) (arg1 ^ arg2);
}
/***************************************************************************
System variables
****************************************************************************/
/*
Return value of an system variable base[.name] as a constant item
SYNOPSIS
get_system_var()
thd Thread handler
var_type global / session
name Name of base or system variable
component Component
NOTES
If component.str = 0 then the variable name is in 'name'
RETURN
0 error
# constant item
*/
Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
LEX_STRING component)
{
sys_var *var;
LEX_STRING *base_name, *component_name;
if (component.str)
{
base_name= &component;
component_name= &name;
}
else
{
base_name= &name;
component_name= &component; // Empty string
}
if (!(var= find_sys_var(thd, base_name->str, base_name->length)))
return 0;
if (component.str)
{
if (!var->is_struct())
{
my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
return 0;
}
}
thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
set_if_smaller(component_name->length, MAX_SYS_VAR_LENGTH);
return new Item_func_get_system_var(var, var_type, component_name,
NULL, 0);
}
/*
Check a user level lock.
SYNOPSIS:
val_int()
RETURN VALUES
1 Available
0 Already taken
NULL Error
*/
longlong Item_func_is_free_lock::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
User_level_lock *ull;
null_value=0;
if (!res || !res->length())
{
null_value=1;
return 0;
}
pthread_mutex_lock(&LOCK_user_locks);
ull= (User_level_lock *) hash_search(&hash_user_locks, (uchar*) res->ptr(),
(size_t) res->length());
pthread_mutex_unlock(&LOCK_user_locks);
if (!ull || !ull->locked)
return 1;
return 0;
}
longlong Item_func_is_used_lock::val_int()
{
DBUG_ASSERT(fixed == 1);
String *res=args[0]->val_str(&value);
User_level_lock *ull;
null_value=1;
if (!res || !res->length())
return 0;
pthread_mutex_lock(&LOCK_user_locks);
ull= (User_level_lock *) hash_search(&hash_user_locks, (uchar*) res->ptr(),
(size_t) res->length());
pthread_mutex_unlock(&LOCK_user_locks);
if (!ull || !ull->locked)
return 0;
null_value=0;
return ull->thread_id;
}
longlong Item_func_row_count::val_int()
{
DBUG_ASSERT(fixed == 1);
THD *thd= current_thd;
return thd->row_count_func;
}
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg, sp_name *name)
:Item_func(), context(context_arg), m_name(name), m_sp(NULL), sp_result_field(NULL)
{
maybe_null= 1;
m_name->init_qname(current_thd);
dummy_table= (TABLE*) sql_calloc(sizeof(TABLE)+ sizeof(TABLE_SHARE));
dummy_table->s= (TABLE_SHARE*) (dummy_table+1);
}
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg,
sp_name *name, List<Item> &list)
:Item_func(list), context(context_arg), m_name(name), m_sp(NULL),sp_result_field(NULL)
{
maybe_null= 1;
m_name->init_qname(current_thd);
dummy_table= (TABLE*) sql_calloc(sizeof(TABLE)+ sizeof(TABLE_SHARE));
dummy_table->s= (TABLE_SHARE*) (dummy_table+1);
}
void
Item_func_sp::cleanup()
{
if (sp_result_field)
{
delete sp_result_field;
sp_result_field= NULL;
}
m_sp= NULL;
dummy_table->alias= NULL;
Item_func::cleanup();
}
const char *
Item_func_sp::func_name() const
{
THD *thd= current_thd;
/* Calculate length to avoid reallocation of string for sure */
uint len= (((m_name->m_explicit_name ? m_name->m_db.length : 0) +
m_name->m_name.length)*2 + //characters*quoting
2 + // ` and `
(m_name->m_explicit_name ?
3 : 0) + // '`', '`' and '.' for the db
1 + // end of string
ALIGN_SIZE(1)); // to avoid String reallocation
String qname((char *)alloc_root(thd->mem_root, len), len,
system_charset_info);
qname.length(0);
if (m_name->m_explicit_name)
{
append_identifier(thd, &qname, m_name->m_db.str, m_name->m_db.length);
qname.append('.');
}
append_identifier(thd, &qname, m_name->m_name.str, m_name->m_name.length);
return qname.ptr();
}
/**
@brief Initialize the result field by creating a temporary dummy table
and assign it to a newly created field object. Meta data used to
create the field is fetched from the sp_head belonging to the stored
proceedure found in the stored procedure functon cache.
@note This function should be called from fix_fields to init the result
field. It is some what related to Item_field.
@see Item_field
@param thd A pointer to the session and thread context.
@return Function return error status.
@retval TRUE is returned on an error
@retval FALSE is returned on success.
*/
bool
Item_func_sp::init_result_field(THD *thd)
{
LEX_STRING empty_name= { C_STRING_WITH_LEN("") };
TABLE_SHARE *share;
DBUG_ENTER("Item_func_sp::init_result_field");
DBUG_ASSERT(m_sp == NULL);
DBUG_ASSERT(sp_result_field == NULL);
if (!(m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
&thd->sp_func_cache, TRUE)))
{
my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
context->process_error(thd);
DBUG_RETURN(TRUE);
}
/*
A Field need to be attached to a Table.
Below we "create" a dummy table by initializing
the needed pointers.
*/
share= dummy_table->s;
dummy_table->alias = "";
dummy_table->maybe_null = maybe_null;
dummy_table->in_use= thd;
dummy_table->copy_blobs= TRUE;
share->table_cache_key = empty_name;
share->table_name = empty_name;
if (!(sp_result_field= m_sp->create_result_field(max_length, name,
dummy_table)))
{
DBUG_RETURN(TRUE);
}
if (sp_result_field->pack_length() > sizeof(result_buf))
{
void *tmp;
if (!(tmp= sql_alloc(sp_result_field->pack_length())))
DBUG_RETURN(TRUE);
sp_result_field->move_field((uchar*) tmp);
}
else
sp_result_field->move_field(result_buf);
sp_result_field->null_ptr= (uchar *) &null_value;
sp_result_field->null_bit= 1;
DBUG_RETURN(FALSE);
}
/**
@brief Initialize local members with values from the Field interface.
@note called from Item::fix_fields.
*/
void Item_func_sp::fix_length_and_dec()
{
DBUG_ENTER("Item_func_sp::fix_length_and_dec");
DBUG_ASSERT(sp_result_field);
decimals= sp_result_field->decimals();
max_length= sp_result_field->field_length;
collation.set(sp_result_field->charset());
maybe_null= 1;
unsigned_flag= test(sp_result_field->flags & UNSIGNED_FLAG);
DBUG_VOID_RETURN;
}
/**
@brief Execute function & store value in field.
@return Function returns error status.
@retval FALSE on success.
@retval TRUE if an error occurred.
*/
bool
Item_func_sp::execute()
{
THD *thd= current_thd;
/* Execute function and store the return value in the field. */
if (execute_impl(thd))
{
null_value= 1;
context->process_error(thd);
if (thd->killed)
thd->send_kill_message();
return TRUE;
}
/* Check that the field (the value) is not NULL. */
null_value= sp_result_field->is_null();
return null_value;
}
/**
@brief Execute function and store the return value in the field.
@note This function was intended to be the concrete implementation of
the interface function execute. This was never realized.
@return The error state.
@retval FALSE on success
@retval TRUE if an error occurred.
*/
bool
Item_func_sp::execute_impl(THD *thd)
{
bool err_status= TRUE;
Sub_statement_state statement_state;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
Security_context *save_security_ctx= thd->security_ctx;
#endif
DBUG_ENTER("Item_func_sp::execute_impl");
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (context->security_ctx)
{
/* Set view definer security context */
thd->security_ctx= context->security_ctx;
}
#endif
if (sp_check_access(thd))
goto error;
/*
Throw an error if a non-deterministic function is called while
statement-based replication (SBR) is active.
*/
if (!m_sp->m_chistics->detistic && !trust_function_creators &&
(mysql_bin_log.is_open() &&
thd->variables.binlog_format == BINLOG_FORMAT_STMT))
{
my_error(ER_BINLOG_ROW_RBR_TO_SBR, MYF(0));
goto error;
}
/*
Disable the binlogging if this is not a SELECT statement. If this is a
SELECT, leave binlogging on, so execute_function() code writes the
function call into binlog.
*/
thd->reset_sub_statement_state(&statement_state, SUB_STMT_FUNCTION);
err_status= m_sp->execute_function(thd, args, arg_count, sp_result_field);
thd->restore_sub_statement_state(&statement_state);
error:
#ifndef NO_EMBEDDED_ACCESS_CHECKS
thd->security_ctx= save_security_ctx;
#endif
DBUG_RETURN(err_status);
}
void
Item_func_sp::make_field(Send_field *tmp_field)
{
DBUG_ENTER("Item_func_sp::make_field");
DBUG_ASSERT(sp_result_field);
sp_result_field->make_field(tmp_field);
DBUG_VOID_RETURN;
}
enum enum_field_types
Item_func_sp::field_type() const
{
DBUG_ENTER("Item_func_sp::field_type");
DBUG_ASSERT(sp_result_field);
DBUG_RETURN(sp_result_field->type());
}
Item_result
Item_func_sp::result_type() const
{
DBUG_ENTER("Item_func_sp::result_type");
DBUG_PRINT("info", ("m_sp = %p", m_sp));
DBUG_ASSERT(sp_result_field);
DBUG_RETURN(sp_result_field->result_type());
}
longlong Item_func_found_rows::val_int()
{
DBUG_ASSERT(fixed == 1);
return current_thd->found_rows();
}
Field *
Item_func_sp::tmp_table_field(TABLE *t_arg)
{
DBUG_ENTER("Item_func_sp::tmp_table_field");
DBUG_ASSERT(sp_result_field);
DBUG_RETURN(sp_result_field);
}
/**
@brief Checks if requested access to function can be granted to user.
If function isn't found yet, it searches function first.
If function can't be found or user don't have requested access
error is raised.
@param thd thread handler
@return Indication if the access was granted or not.
@retval FALSE Access is granted.
@retval TRUE Requested access can't be granted or function doesn't exists.
*/
bool
Item_func_sp::sp_check_access(THD *thd)
{
DBUG_ENTER("Item_func_sp::sp_check_access");
DBUG_ASSERT(m_sp);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (check_routine_access(thd, EXECUTE_ACL,
m_sp->m_db.str, m_sp->m_name.str, 0, FALSE))
DBUG_RETURN(TRUE);
#endif
DBUG_RETURN(FALSE);
}
bool
Item_func_sp::fix_fields(THD *thd, Item **ref)
{
bool res;
DBUG_ENTER("Item_func_sp::fix_fields");
DBUG_ASSERT(fixed == 0);
/*
We must call init_result_field before Item_func::fix_fields()
to make m_sp and result_field members available to fix_length_and_dec(),
which is called from Item_func::fix_fields().
*/
res= init_result_field(thd);
if (res)
DBUG_RETURN(res);
res= Item_func::fix_fields(thd, ref);
if (res)
DBUG_RETURN(res);
if (thd->lex->view_prepare_mode)
{
/*
Here we check privileges of the stored routine only during view
creation, in order to validate the view. A runtime check is
perfomed in Item_func_sp::execute(), and this method is not
called during context analysis. Notice, that during view
creation we do not infer into stored routine bodies and do not
check privileges of its statements, which would probably be a
good idea especially if the view has SQL SECURITY DEFINER and
the used stored procedure has SQL SECURITY DEFINER.
*/
res= sp_check_access(thd);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/*
Try to set and restore the security context to see whether it's valid
*/
Security_context *save_secutiry_ctx;
res= set_routine_security_ctx(thd, m_sp, false, &save_secutiry_ctx);
if (!res)
m_sp->m_security_ctx.restore_security_context(thd, save_secutiry_ctx);
#endif /* ! NO_EMBEDDED_ACCESS_CHECKS */
}
if (!m_sp->m_chistics->detistic)
{
used_tables_cache |= RAND_TABLE_BIT;
const_item_cache= FALSE;
}
DBUG_RETURN(res);
}
void Item_func_sp::update_used_tables()
{
Item_func::update_used_tables();
if (!m_sp->m_chistics->detistic)
{
used_tables_cache |= RAND_TABLE_BIT;
const_item_cache= FALSE;
}
}
/*
uuid_short handling.
The short uuid is defined as a longlong that contains the following bytes:
Bytes Comment
1 Server_id & 255
4 Startup time of server in seconds
3 Incrementor
This means that an uuid is guaranteed to be unique
even in a replication environment if the following holds:
- The last byte of the server id is unique
- If you between two shutdown of the server don't get more than
an average of 2^24 = 16M calls to uuid_short() per second.
*/
ulonglong uuid_value;
void uuid_short_init()
{
uuid_value= ((((ulonglong) server_id) << 56) +
(((ulonglong) server_start_time) << 24));
}
longlong Item_func_uuid_short::val_int()
{
ulonglong val;
pthread_mutex_lock(&LOCK_uuid_generator);
val= uuid_value++;
pthread_mutex_unlock(&LOCK_uuid_generator);
return (longlong) val;
}
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