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item_func.cc
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7193 lines (6238 loc) · 183 KB
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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file
@brief
This file defines all numerical functions
*/
#include "my_global.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
/*
It is necessary to include set_var.h instead of item.h because there
are dependencies on include order for set_var.h and item.h. This
will be resolved later.
*/
#include "sql_class.h" // set_var.h: THD
#include "set_var.h"
#include "rpl_slave.h" // for wait_for_master_pos
#include "sql_show.h" // append_identifier
#include "strfunc.h" // find_type
#include "sql_parse.h" // is_update_query
#include "sql_acl.h" // EXECUTE_ACL
#include "mysqld.h" // LOCK_uuid_generator
#include "rpl_mi.h"
#include "sql_time.h"
#include <m_ctype.h>
#include <hash.h>
#include <time.h>
#include <ft_global.h>
#include <my_bit.h>
#include "sp_head.h"
#include "sp_rcontext.h"
#include "sp.h"
#include "set_var.h"
#include "debug_sync.h"
#include <mysql/plugin.h>
#include <mysql/service_thd_wait.h>
#include "rpl_gtid.h"
using std::min;
using std::max;
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(Item *cond)
{
return ((Item_func*) cond)->val_int() ? TRUE : FALSE;
}
/**
Test if the sum of arguments overflows the ulonglong range.
*/
static inline bool test_if_sum_overflows_ull(ulonglong arg1, ulonglong arg2)
{
return ULONGLONG_MAX - arg1 < arg2;
}
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),
const_item_cache(0),
allowed_arg_cols(item->allowed_arg_cols),
used_tables_cache(item->used_tables_cache),
not_null_tables_cache(item->not_null_tables_cache),
arg_count(item->arg_count)
{
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 || basic_const_item());
Item **arg,**arg_end;
uchar buff[STACK_BUFF_ALLOC]; // Max argument in function
Switch_resolve_place SRP(thd->lex->current_select ?
&thd->lex->current_select->resolve_place : NULL,
st_select_lex::RESOLVE_NONE,
thd->lex->current_select);
used_tables_cache= get_initial_pseudo_tables();
not_null_tables_cache= 0;
const_item_cache=1;
/*
Use stack limit of STACK_MIN_SIZE * 2 since
on some platforms a recursive call to fix_fields
requires more than STACK_MIN_SIZE bytes (e.g. for
MIPS, it takes about 22kB to make one recursive
call to Item_func::fix_fields())
*/
if (check_stack_overrun(thd, STACK_MIN_SIZE * 2, 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->has_subquery();
with_stored_program|= item->has_stored_program();
}
}
fix_length_and_dec();
if (thd->is_error()) // An error inside fix_length_and_dec occured
return TRUE;
fixed= 1;
return FALSE;
}
void Item_func::fix_after_pullout(st_select_lex *parent_select,
st_select_lex *removed_select)
{
if (const_item())
{
/*
Pulling out a const item changes nothing to it. Moreover, some items may
have decided that they're const by some other logic than the generic
one below, and we must preserve that decision.
*/
return;
}
Item **arg,**arg_end;
used_tables_cache= get_initial_pseudo_tables();
not_null_tables_cache= 0;
const_item_cache=1;
if (arg_count)
{
for (arg=args, arg_end=args+arg_count; arg != arg_end ; arg++)
{
Item *const item= *arg;
item->fix_after_pullout(parent_select, removed_select);
used_tables_cache|= item->used_tables();
not_null_tables_cache|= item->not_null_tables();
const_item_cache&= item->const_item();
}
}
}
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.
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.
@param transformer the transformer callback function to be applied to
the nodes of the tree of the object
@param argument parameter to be passed to the transformer
@return
Item returned as the result of transformation of the root node
*/
Item *Item_func::transform(Item_transformer transformer, uchar *argument)
{
DBUG_ASSERT(!current_thd->stmt_arena->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.
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.
@param analyzer the analyzer callback function to be applied to the
nodes of the tree of the object
@param[in,out] arg_p parameter to be passed to the processor
@param transformer the transformer callback function to be applied to the
nodes of the tree of the object
@param arg_t parameter to be passed to the transformer
@return Item returned as result of transformation of the node,
the same item if no transformation applied, or NULL if
transformation caused an error.
*/
Item *Item_func::compile(Item_analyzer analyzer, uchar **arg_p,
Item_transformer transformer, uchar *arg_t)
{
if (!(this->*analyzer)(arg_p))
return this;
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 == NULL)
return NULL;
if (*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, Ref_ptr_array 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= get_initial_pseudo_tables();
const_item_cache=1;
with_subselect= false;
with_stored_program= false;
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();
with_subselect|= args[i]->has_subquery();
with_stored_program|= args[i]->has_stored_program();
}
}
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, enum_query_type query_type)
{
str->append(func_name());
str->append('(');
print_args(str, 0, query_type);
str->append(')');
}
void Item_func::print_args(String *str, uint from, enum_query_type query_type)
{
for (uint i=from ; i < arg_count ; i++)
{
if (i != from)
str->append(',');
args[i]->print(str, query_type);
}
}
void Item_func::print_op(String *str, enum_query_type query_type)
{
str->append('(');
for (uint i=0 ; i < arg_count-1 ; i++)
{
args[i]->print(str, query_type);
str->append(' ');
str->append(func_name());
str->append(' ');
}
args[arg_count-1]->print(str, query_type);
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= NULL;
switch (result_type()) {
case INT_RESULT:
if (max_char_length() > MY_INT32_NUM_DECIMAL_DIGITS)
field= new Field_longlong(max_char_length(), maybe_null, item_name.ptr(),
unsigned_flag);
else
field= new Field_long(max_char_length(), maybe_null, item_name.ptr(),
unsigned_flag);
break;
case REAL_RESULT:
field= new Field_double(max_char_length(), maybe_null, item_name.ptr(), decimals);
break;
case STRING_RESULT:
return make_string_field(table);
break;
case DECIMAL_RESULT:
field= Field_new_decimal::create_from_item(this);
break;
case ROW_RESULT:
default:
// This case should never be chosen
DBUG_ASSERT(0);
field= 0;
break;
}
if (field)
field->init(table);
return field;
}
my_decimal *Item_func::val_decimal(my_decimal *decimal_value)
{
DBUG_ASSERT(fixed);
longlong nr= val_int();
if (null_value)
return 0; /* purecov: inspected */
int2my_decimal(E_DEC_FATAL_ERROR, nr, 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, collation.collation);
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()
{}
/**
Count max_length and decimals for temporal functions.
@param item Argument array
@param nitems Number of arguments in the array.
@retval False on success, true on error.
*/
void Item_func::count_datetime_length(Item **item, uint nitems)
{
unsigned_flag= 0;
decimals= 0;
if (field_type() != MYSQL_TYPE_DATE)
{
for (uint i= 0; i < nitems; i++)
set_if_bigger(decimals,
field_type() == MYSQL_TYPE_TIME ?
item[i]->time_precision() : item[i]->datetime_precision());
}
set_if_smaller(decimals, DATETIME_MAX_DECIMALS);
uint len= decimals ? (decimals + 1) : 0;
switch (field_type())
{
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
len+= MAX_DATETIME_WIDTH;
break;
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_NEWDATE:
len+= MAX_DATE_WIDTH;
break;
case MYSQL_TYPE_TIME:
len+= MAX_TIME_WIDTH;
break;
default:
DBUG_ASSERT(0);
}
fix_char_length(len);
}
/**
Set max_length/decimals of function if function is fixed point and
result length/precision depends on argument ones.
*/
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);
fix_char_length(my_decimal_precision_to_length_no_truncation(precision,
decimals,
unsigned_flag));
}
/**
Set max_length of if it is maximum length of its arguments.
*/
void Item_func::count_only_length(Item **item, uint nitems)
{
uint32 char_length= 0;
unsigned_flag= 1;
for (uint i= 0; i < nitems; i++)
{
set_if_bigger(char_length, item[i]->max_char_length());
set_if_smaller(unsigned_flag, item[i]->unsigned_flag);
}
fix_char_length(char_length);
}
/**
Set max_length/decimals of function if function is floating point and
result length/precision depends on argument ones.
*/
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;
}
}
/**
Calculate max_length and decimals for STRING_RESULT functions.
@param field_type Field type.
@param items Argument array.
@param nitems Number of arguments.
@retval False on success, true on error.
*/
bool Item_func::count_string_result_length(enum_field_types field_type,
Item **items, uint nitems)
{
if (agg_arg_charsets_for_string_result(collation, items, nitems))
return true;
if (is_temporal_type(field_type))
count_datetime_length(items, nitems);
else
{
decimals= NOT_FIXED_DEC;
count_only_length(items, nitems);
}
return false;
}
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, Sql_condition::WARN_LEVEL_WARN, 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())
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, collation.collation);
return str;
}
void Item_func_connection_id::fix_length_and_dec()
{
Item_int_func::fix_length_and_dec();
unsigned_flag= 1;
}
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.
*/
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]->numeric_context_result_type();
Item_result r1= args[1]->numeric_context_result_type();
DBUG_ASSERT(r0 != STRING_RESULT && r1 != STRING_RESULT);
if (r0 == REAL_RESULT || r1 == REAL_RESULT)
{
/*
Since DATE/TIME/DATETIME data types return INT_RESULT/DECIMAL_RESULT
type codes, we should never get to here when both fields are temporal.
*/
DBUG_ASSERT(!args[0]->is_temporal() || !args[1]->is_temporal());
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)
*/
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);
str->set_charset(collation.collation);
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, collation.collation);
break;
}
case REAL_RESULT:
{
double nr= real_op();
if (null_value)
return 0; /* purecov: inspected */
str->set_real(nr, decimals, collation.collation);
break;
}
case STRING_RESULT:
switch (field_type()) {
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
return val_string_from_datetime(str);
case MYSQL_TYPE_DATE:
return val_string_from_date(str);
case MYSQL_TYPE_TIME:
return val_string_from_time(str);
default:
break;
}
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:
{
switch (field_type())
{
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIMESTAMP:
return val_real_from_decimal();
default:
break;
}
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:
{
switch (field_type())
{
case MYSQL_TYPE_DATE: