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mariadb/sql/sql_type.h
Alexander Barkov ba670edfa3 MDEV-12559 Split Item::temporal_precision() into virtual methods in Type_handler 
- Adding a new virtual method Type_handler::Item_time_precision()
- Adding a new virtual method Type_handler::Item_datetime_precision()
- Removing Item::temporal_precision() and adding Item::time_precision()
  and Item::datetime_precision() instead.
- Moving Item_func_convert_tz::fix_length_and_dec() from item_timefunc.cc
  to item_timefunc.h. It's only two lines, and we're changing it anyway.
- Removing Item_temporal_typecast::fix_length_and_dec_generic(),
  moving this code to
  Type_handler::Item_{date|time|datetime}_typecast_fix_length_and_dec().
  This allows to get rid of one more field_type() call.
  Also, in the old reduction, Item_date_typecast::fix_length_and_dec()
  unnecessarily called args[0]->temporal_precision(). The new reduction
  does not call args[0]->datetime_precision(), as DATE does not
  have fractional digits.
2017-04-22 21:59:00 +04:00

1759 lines
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#ifndef SQL_TYPE_H_INCLUDED
#define SQL_TYPE_H_INCLUDED
/*
Copyright (c) 2015 MariaDB Foundation.
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 */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
#include "mysqld.h"
#include "sql_array.h"
#include "sql_const.h"
#include "my_time.h"
class Field;
class Item;
class Item_cache;
class Item_func_or_sum;
class Item_sum_hybrid;
class Item_sum_sum;
class Item_sum_avg;
class Item_sum_variance;
class Item_func_hex;
class Item_hybrid_func;
class Item_func_min_max;
class Item_func_hybrid_field_type;
class Item_bool_func2;
class Item_func_between;
class Item_func_in;
class Item_func_round;
class Item_func_int_val;
class Item_func_abs;
class Item_func_neg;
class Item_func_signed;
class Item_func_unsigned;
class Item_double_typecast;
class Item_decimal_typecast;
class Item_char_typecast;
class Item_time_typecast;
class Item_date_typecast;
class Item_datetime_typecast;
class Item_func_plus;
class Item_func_minus;
class Item_func_mul;
class Item_func_div;
class Item_func_mod;
class cmp_item;
class in_vector;
class Type_std_attributes;
class Sort_param;
class Arg_comparator;
struct TABLE;
struct SORT_FIELD_ATTR;
/*
Flags for collation aggregation modes, used in TDCollation::agg():
MY_COLL_ALLOW_SUPERSET_CONV - allow conversion to a superset
MY_COLL_ALLOW_COERCIBLE_CONV - allow conversion of a coercible value
(i.e. constant).
MY_COLL_ALLOW_CONV - allow any kind of conversion
(combination of the above two)
MY_COLL_ALLOW_NUMERIC_CONV - if all items were numbers, convert to
@@character_set_connection
MY_COLL_DISALLOW_NONE - don't allow return DERIVATION_NONE
(e.g. when aggregating for comparison)
MY_COLL_CMP_CONV - combination of MY_COLL_ALLOW_CONV
and MY_COLL_DISALLOW_NONE
*/
#define MY_COLL_ALLOW_SUPERSET_CONV 1
#define MY_COLL_ALLOW_COERCIBLE_CONV 2
#define MY_COLL_DISALLOW_NONE 4
#define MY_COLL_ALLOW_NUMERIC_CONV 8
#define MY_COLL_ALLOW_CONV (MY_COLL_ALLOW_SUPERSET_CONV | MY_COLL_ALLOW_COERCIBLE_CONV)
#define MY_COLL_CMP_CONV (MY_COLL_ALLOW_CONV | MY_COLL_DISALLOW_NONE)
#define my_charset_numeric my_charset_latin1
#define MY_REPERTOIRE_NUMERIC MY_REPERTOIRE_ASCII
enum Derivation
{
DERIVATION_IGNORABLE= 6,
DERIVATION_NUMERIC= 5,
DERIVATION_COERCIBLE= 4,
DERIVATION_SYSCONST= 3,
DERIVATION_IMPLICIT= 2,
DERIVATION_NONE= 1,
DERIVATION_EXPLICIT= 0
};
/**
"Declared Type Collation"
A combination of collation and its derivation.
*/
class DTCollation {
public:
CHARSET_INFO *collation;
enum Derivation derivation;
uint repertoire;
void set_repertoire_from_charset(CHARSET_INFO *cs)
{
repertoire= cs->state & MY_CS_PUREASCII ?
MY_REPERTOIRE_ASCII : MY_REPERTOIRE_UNICODE30;
}
DTCollation()
{
collation= &my_charset_bin;
derivation= DERIVATION_NONE;
repertoire= MY_REPERTOIRE_UNICODE30;
}
DTCollation(CHARSET_INFO *collation_arg, Derivation derivation_arg)
{
collation= collation_arg;
derivation= derivation_arg;
set_repertoire_from_charset(collation_arg);
}
DTCollation(CHARSET_INFO *collation_arg,
Derivation derivation_arg,
uint repertoire_arg)
:collation(collation_arg),
derivation(derivation_arg),
repertoire(repertoire_arg)
{ }
void set(const DTCollation &dt)
{
collation= dt.collation;
derivation= dt.derivation;
repertoire= dt.repertoire;
}
void set(CHARSET_INFO *collation_arg, Derivation derivation_arg)
{
collation= collation_arg;
derivation= derivation_arg;
set_repertoire_from_charset(collation_arg);
}
void set(CHARSET_INFO *collation_arg,
Derivation derivation_arg,
uint repertoire_arg)
{
collation= collation_arg;
derivation= derivation_arg;
repertoire= repertoire_arg;
}
void set_numeric()
{
collation= &my_charset_numeric;
derivation= DERIVATION_NUMERIC;
repertoire= MY_REPERTOIRE_NUMERIC;
}
void set(CHARSET_INFO *collation_arg)
{
collation= collation_arg;
set_repertoire_from_charset(collation_arg);
}
void set(Derivation derivation_arg)
{ derivation= derivation_arg; }
bool aggregate(const DTCollation &dt, uint flags= 0);
bool set(DTCollation &dt1, DTCollation &dt2, uint flags= 0)
{ set(dt1); return aggregate(dt2, flags); }
const char *derivation_name() const
{
switch(derivation)
{
case DERIVATION_NUMERIC: return "NUMERIC";
case DERIVATION_IGNORABLE: return "IGNORABLE";
case DERIVATION_COERCIBLE: return "COERCIBLE";
case DERIVATION_IMPLICIT: return "IMPLICIT";
case DERIVATION_SYSCONST: return "SYSCONST";
case DERIVATION_EXPLICIT: return "EXPLICIT";
case DERIVATION_NONE: return "NONE";
default: return "UNKNOWN";
}
}
int sortcmp(const String *s, const String *t) const
{
return collation->coll->strnncollsp(collation,
(uchar *) s->ptr(), s->length(),
(uchar *) t->ptr(), t->length());
}
};
static inline uint32
char_to_byte_length_safe(size_t char_length_arg, uint32 mbmaxlen_arg)
{
ulonglong tmp= ((ulonglong) char_length_arg) * mbmaxlen_arg;
return tmp > UINT_MAX32 ? UINT_MAX32 : static_cast<uint32>(tmp);
}
/**
A class to store type attributes for the standard data types.
Does not include attributes for the extended data types
such as ENUM, SET, GEOMETRY.
*/
class Type_std_attributes
{
public:
DTCollation collation;
uint decimals;
/*
The maximum value length in characters multiplied by collation->mbmaxlen.
Almost always it's the maximum value length in bytes.
*/
uint32 max_length;
bool unsigned_flag;
Type_std_attributes()
:collation(&my_charset_bin, DERIVATION_COERCIBLE),
decimals(0), max_length(0), unsigned_flag(false)
{ }
Type_std_attributes(const Type_std_attributes *other)
:collation(other->collation),
decimals(other->decimals),
max_length(other->max_length),
unsigned_flag(other->unsigned_flag)
{ }
Type_std_attributes(uint32 max_length_arg, uint decimals_arg,
bool unsigned_flag_arg, const DTCollation &dtc)
:collation(dtc),
decimals(decimals_arg),
max_length(max_length_arg),
unsigned_flag(unsigned_flag_arg)
{ }
void set(const Type_std_attributes *other)
{
*this= *other;
}
void set(const Type_std_attributes &other)
{
*this= other;
}
void set(const Field *field);
uint32 max_char_length() const
{ return max_length / collation.collation->mbmaxlen; }
void fix_length_and_charset(uint32 max_char_length_arg, CHARSET_INFO *cs)
{
max_length= char_to_byte_length_safe(max_char_length_arg, cs->mbmaxlen);
collation.collation= cs;
}
void fix_char_length(uint32 max_char_length_arg)
{
max_length= char_to_byte_length_safe(max_char_length_arg,
collation.collation->mbmaxlen);
}
void fix_char_length_temporal_not_fixed_dec(uint int_part_length, uint dec)
{
uint char_length= int_part_length;
if ((decimals= dec))
{
if (decimals == NOT_FIXED_DEC)
char_length+= TIME_SECOND_PART_DIGITS + 1;
else
{
set_if_smaller(decimals, TIME_SECOND_PART_DIGITS);
char_length+= decimals + 1;
}
}
fix_char_length(char_length);
}
void fix_attributes_temporal_not_fixed_dec(uint int_part_length, uint dec)
{
collation.set_numeric();
unsigned_flag= 0;
fix_char_length_temporal_not_fixed_dec(int_part_length, dec);
}
void fix_attributes_time_not_fixed_dec(uint dec)
{
fix_attributes_temporal_not_fixed_dec(MIN_TIME_WIDTH, dec);
}
void fix_attributes_datetime_not_fixed_dec(uint dec)
{
fix_attributes_temporal_not_fixed_dec(MAX_DATETIME_WIDTH, dec);
}
void fix_attributes_temporal(uint int_part_length, uint dec)
{
collation.set_numeric();
unsigned_flag= 0;
decimals= MY_MIN(dec, TIME_SECOND_PART_DIGITS);
max_length= decimals + int_part_length + (dec ? 1 : 0);
}
void fix_attributes_date()
{
fix_attributes_temporal(MAX_DATE_WIDTH, 0);
}
void fix_attributes_time(uint dec)
{
fix_attributes_temporal(MIN_TIME_WIDTH, dec);
}
void fix_attributes_datetime(uint dec)
{
fix_attributes_temporal(MAX_DATETIME_WIDTH, dec);
}
};
class Name: private LEX_CSTRING
{
public:
Name(const char *str_arg, uint length_arg)
{
LEX_CSTRING::str= str_arg;
LEX_CSTRING::length= length_arg;
}
const char *ptr() const { return LEX_CSTRING::str; }
uint length() const { return LEX_CSTRING::length; }
};
class Type_handler
{
protected:
String *print_item_value_csstr(THD *thd, Item *item, String *str) const;
String *print_item_value_temporal(THD *thd, Item *item, String *str,
const Name &type_name, String *buf) const;
void make_sort_key_longlong(uchar *to,
bool maybe_null, bool null_value,
bool unsigned_flag,
longlong value) const;
bool
Item_func_or_sum_illegal_param(const char *name) const;
bool
Item_func_or_sum_illegal_param(const Item_func_or_sum *) const;
public:
static const Type_handler *string_type_handler(uint max_octet_length);
static const Type_handler *get_handler_by_field_type(enum_field_types type);
static const Type_handler *get_handler_by_real_type(enum_field_types type);
static const Type_handler *get_handler_by_cmp_type(Item_result type);
static const Type_handler *get_handler_by_result_type(Item_result type)
{
/*
As result_type() returns STRING_RESULT for temporal Items,
type should never be equal to TIME_RESULT here.
*/
DBUG_ASSERT(type != TIME_RESULT);
return get_handler_by_cmp_type(type);
}
static const
Type_handler *aggregate_for_result_traditional(const Type_handler *h1,
const Type_handler *h2);
static const
Type_handler *aggregate_for_num_op_traditional(const Type_handler *h1,
const Type_handler *h2);
virtual const Name name() const= 0;
virtual enum_field_types field_type() const= 0;
virtual enum_field_types real_field_type() const { return field_type(); }
virtual Item_result result_type() const= 0;
virtual Item_result cmp_type() const= 0;
/**
Prepared statement long data:
Check whether this parameter data type is compatible with long data.
Used to detect whether a long data stream has been supplied to a
incompatible data type.
*/
virtual bool is_param_long_data_type() const { return false; }
virtual const Type_handler *type_handler_for_comparison() const= 0;
virtual CHARSET_INFO *charset_for_protocol(const Item *item) const;
virtual const Type_handler*
type_handler_adjusted_to_max_octet_length(uint max_octet_length,
CHARSET_INFO *cs) const
{ return this; }
virtual ~Type_handler() {}
/**
Determines MariaDB traditional data types that always present
in the server.
*/
virtual bool is_traditional_type() const
{
return true;
}
virtual uint Item_time_precision(Item *item) const;
virtual uint Item_datetime_precision(Item *item) const;
/**
Makes a temporary table Field to handle numeric aggregate functions,
e.g. SUM(DISTINCT expr), AVG(DISTINCT expr), etc.
*/
virtual Field *make_num_distinct_aggregator_field(MEM_ROOT *,
const Item *) const;
/**
Makes a temporary table Field to handle RBR replication type conversion.
@param TABLE - The conversion table the field is going to be added to.
It's used to access to table->in_use->mem_root,
to create the new field on the table memory root,
as well as to increment statistics in table->share
(e.g. table->s->blob_count).
@param metadata - Metadata from the binary log.
@param target - The field in the target table on the slave.
Note, the data types of "target" and of "this" are not necessarily
always the same, in general case it's possible that:
this->field_type() != target->field_type()
and/or
this->real_type( ) != target->real_type()
This method decodes metadata according to this->real_type()
and creates a new field also according to this->real_type().
In some cases it lurks into "target", to get some extra information, e.g.:
- unsigned_flag for numeric fields
- charset() for string fields
- typelib and field_length for SET and ENUM
- geom_type and srid for GEOMETRY
This information is not available in the binary log, so
we assume that these fields are the same on the master and on the slave.
*/
virtual Field *make_conversion_table_field(TABLE *TABLE,
uint metadata,
const Field *target) const= 0;
virtual void make_sort_key(uchar *to, Item *item,
const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const= 0;
virtual void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const= 0;
virtual uint32 max_display_length(const Item *item) const= 0;
virtual int Item_save_in_field(Item *item, Field *field,
bool no_conversions) const= 0;
/**
Return a string representation of the Item value.
@param thd thread handle
@param str string buffer for representation of the value
@note
If the item has a string result type, the string is escaped
according to its character set.
@retval
NULL on error
@retval
non-NULL a pointer to a a valid string on success
*/
virtual String *print_item_value(THD *thd, Item *item, String *str) const= 0;
/**
Check if
WHERE expr=value AND expr=const
can be rewritten as:
WHERE const=value AND expr=const
"this" is the comparison handler that is used by "target".
@param target - the predicate expr=value,
whose "expr" argument will be replaced to "const".
@param target_expr - the target's "expr" which will be replaced to "const".
@param target_value - the target's second argument, it will remain unchanged.
@param source - the equality predicate expr=const (or expr<=>const)
that can be used to rewrite the "target" part
(under certain conditions, see the code).
@param source_expr - the source's "expr". It should be exactly equal to
the target's "expr" to make condition rewrite possible.
@param source_const - the source's "const" argument, it will be inserted
into "target" instead of "expr".
*/
virtual bool
can_change_cond_ref_to_const(Item_bool_func2 *target,
Item *target_expr, Item *target_value,
Item_bool_func2 *source,
Item *source_expr, Item *source_const) const= 0;
virtual Item_cache *Item_get_cache(THD *thd, const Item *item) const= 0;
virtual bool set_comparator_func(Arg_comparator *cmp) const= 0;
virtual bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items,
uint nitems) const= 0;
virtual bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *) const= 0;
virtual bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const= 0;
virtual bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const= 0;
virtual
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const= 0;
virtual String *Item_func_hex_val_str_ascii(Item_func_hex *item,
String *str) const= 0;
virtual
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const= 0;
virtual
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const= 0;
virtual
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const= 0;
virtual
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const= 0;
virtual
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const= 0;
virtual
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const= 0;
virtual
double Item_func_min_max_val_real(Item_func_min_max *) const= 0;
virtual
longlong Item_func_min_max_val_int(Item_func_min_max *) const= 0;
virtual
my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
my_decimal *) const= 0;
virtual
bool Item_func_min_max_get_date(Item_func_min_max*,
MYSQL_TIME *, ulonglong fuzzydate) const= 0;
virtual longlong
Item_func_between_val_int(Item_func_between *func) const= 0;
virtual cmp_item *
make_cmp_item(THD *thd, CHARSET_INFO *cs) const= 0;
virtual in_vector *
make_in_vector(THD *thd, const Item_func_in *func, uint nargs) const= 0;
virtual bool
Item_func_in_fix_comparator_compatible_types(THD *thd, Item_func_in *)
const= 0;
virtual bool
Item_func_round_fix_length_and_dec(Item_func_round *round) const= 0;
virtual bool
Item_func_int_val_fix_length_and_dec(Item_func_int_val *func) const= 0;
virtual bool
Item_func_abs_fix_length_and_dec(Item_func_abs *func) const= 0;
virtual bool
Item_func_neg_fix_length_and_dec(Item_func_neg *func) const= 0;
virtual bool
Item_func_signed_fix_length_and_dec(Item_func_signed *item) const;
virtual bool
Item_func_unsigned_fix_length_and_dec(Item_func_unsigned *item) const;
virtual bool
Item_double_typecast_fix_length_and_dec(Item_double_typecast *item) const;
virtual bool
Item_decimal_typecast_fix_length_and_dec(Item_decimal_typecast *item) const;
virtual bool
Item_char_typecast_fix_length_and_dec(Item_char_typecast *item) const;
virtual bool
Item_time_typecast_fix_length_and_dec(Item_time_typecast *item) const;
virtual bool
Item_date_typecast_fix_length_and_dec(Item_date_typecast *item) const;
virtual bool
Item_datetime_typecast_fix_length_and_dec(Item_datetime_typecast *item) const;
virtual bool
Item_func_plus_fix_length_and_dec(Item_func_plus *func) const= 0;
virtual bool
Item_func_minus_fix_length_and_dec(Item_func_minus *func) const= 0;
virtual bool
Item_func_mul_fix_length_and_dec(Item_func_mul *func) const= 0;
virtual bool
Item_func_div_fix_length_and_dec(Item_func_div *func) const= 0;
virtual bool
Item_func_mod_fix_length_and_dec(Item_func_mod *func) const= 0;
};
/*
Special handler for ROW
*/
class Type_handler_row: public Type_handler
{
static const Name m_name_row;
public:
virtual ~Type_handler_row() {}
const Name name() const { return m_name_row; }
enum_field_types field_type() const
{
DBUG_ASSERT(0);
return MYSQL_TYPE_NULL;
};
Item_result result_type() const
{
return ROW_RESULT;
}
Item_result cmp_type() const
{
return ROW_RESULT;
}
const Type_handler *type_handler_for_comparison() const;
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const
{
DBUG_ASSERT(0);
return NULL;
}
Field *make_conversion_table_field(TABLE *TABLE,
uint metadata,
const Field *target) const
{
DBUG_ASSERT(0);
return NULL;
}
void make_sort_key(uchar *to, Item *item,
const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const
{
DBUG_ASSERT(0);
}
void sortlength(THD *thd, const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const
{
DBUG_ASSERT(0);
}
uint32 max_display_length(const Item *item) const
{
DBUG_ASSERT(0);
return 0;
}
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const
{
DBUG_ASSERT(0);
return 1;
}
String *print_item_value(THD *thd, Item *item, String *str) const;
bool can_change_cond_ref_to_const(Item_bool_func2 *target,
Item *target_expr, Item *target_value,
Item_bool_func2 *source,
Item *source_expr, Item *source_const) const
{
DBUG_ASSERT(0);
return false;
}
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const
{
DBUG_ASSERT(0);
return true;
}
String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const
{
DBUG_ASSERT(0);
return NULL;
}
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const
{
DBUG_ASSERT(0);
return NULL;
}
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const
{
DBUG_ASSERT(0);
return 0.0;
}
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const
{
DBUG_ASSERT(0);
return 0;
}
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const
{
DBUG_ASSERT(0);
return NULL;
}
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const
{
DBUG_ASSERT(0);
return true;
}
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const
{
DBUG_ASSERT(0);
return NULL;
}
double Item_func_min_max_val_real(Item_func_min_max *) const
{
DBUG_ASSERT(0);
return 0;
}
longlong Item_func_min_max_val_int(Item_func_min_max *) const
{
DBUG_ASSERT(0);
return 0;
}
my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
my_decimal *) const
{
DBUG_ASSERT(0);
return NULL;
}
bool Item_func_min_max_get_date(Item_func_min_max*,
MYSQL_TIME *, ulonglong fuzzydate) const
{
DBUG_ASSERT(0);
return true;
}
longlong Item_func_between_val_int(Item_func_between *func) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *thd, const Item_func_in *f, uint nargs) const;
bool Item_func_in_fix_comparator_compatible_types(THD *thd,
Item_func_in *) const;
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_func_signed_fix_length_and_dec(Item_func_signed *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_func_unsigned_fix_length_and_dec(Item_func_unsigned *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_double_typecast_fix_length_and_dec(Item_double_typecast *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_decimal_typecast_fix_length_and_dec(Item_decimal_typecast *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_char_typecast_fix_length_and_dec(Item_char_typecast *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_time_typecast_fix_length_and_dec(Item_time_typecast *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_date_typecast_fix_length_and_dec(Item_date_typecast *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_datetime_typecast_fix_length_and_dec(Item_datetime_typecast *) const
{
DBUG_ASSERT(0);
return true;
}
bool Item_func_plus_fix_length_and_dec(Item_func_plus *) const;
bool Item_func_minus_fix_length_and_dec(Item_func_minus *) const;
bool Item_func_mul_fix_length_and_dec(Item_func_mul *) const;
bool Item_func_div_fix_length_and_dec(Item_func_div *) const;
bool Item_func_mod_fix_length_and_dec(Item_func_mod *) const;
};
/*
A common parent class for numeric data type handlers
*/
class Type_handler_numeric: public Type_handler
{
protected:
bool Item_sum_hybrid_fix_length_and_dec_numeric(Item_sum_hybrid *func,
const Type_handler *handler)
const;
public:
String *print_item_value(THD *thd, Item *item, String *str) const;
double Item_func_min_max_val_real(Item_func_min_max *) const;
longlong Item_func_min_max_val_int(Item_func_min_max *) const;
my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
my_decimal *) const;
bool Item_func_min_max_get_date(Item_func_min_max*,
MYSQL_TIME *, ulonglong fuzzydate) const;
virtual ~Type_handler_numeric() { }
bool can_change_cond_ref_to_const(Item_bool_func2 *target,
Item *target_expr, Item *target_value,
Item_bool_func2 *source,
Item *source_expr, Item *source_const) const;
bool Item_char_typecast_fix_length_and_dec(Item_char_typecast *) const;
};
/*** Abstract classes for every XXX_RESULT */
class Type_handler_real_result: public Type_handler_numeric
{
public:
Item_result result_type() const { return REAL_RESULT; }
Item_result cmp_type() const { return REAL_RESULT; }
virtual ~Type_handler_real_result() {}
const Type_handler *type_handler_for_comparison() const;
void make_sort_key(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const;
void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const;
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const;
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const;
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const;
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const;
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
longlong Item_func_between_val_int(Item_func_between *func) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
bool Item_func_in_fix_comparator_compatible_types(THD *thd,
Item_func_in *) const;
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_func_plus_fix_length_and_dec(Item_func_plus *) const;
bool Item_func_minus_fix_length_and_dec(Item_func_minus *) const;
bool Item_func_mul_fix_length_and_dec(Item_func_mul *) const;
bool Item_func_div_fix_length_and_dec(Item_func_div *) const;
bool Item_func_mod_fix_length_and_dec(Item_func_mod *) const;
};
class Type_handler_decimal_result: public Type_handler_numeric
{
public:
Item_result result_type() const { return DECIMAL_RESULT; }
Item_result cmp_type() const { return DECIMAL_RESULT; }
virtual ~Type_handler_decimal_result() {};
const Type_handler *type_handler_for_comparison() const;
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const;
void make_sort_key(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const;
void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
uint32 max_display_length(const Item *item) const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const;
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const;
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const;
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const;
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const;
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
longlong Item_func_between_val_int(Item_func_between *func) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
bool Item_func_in_fix_comparator_compatible_types(THD *thd,
Item_func_in *) const;
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_func_plus_fix_length_and_dec(Item_func_plus *) const;
bool Item_func_minus_fix_length_and_dec(Item_func_minus *) const;
bool Item_func_mul_fix_length_and_dec(Item_func_mul *) const;
bool Item_func_div_fix_length_and_dec(Item_func_div *) const;
bool Item_func_mod_fix_length_and_dec(Item_func_mod *) const;
};
class Type_handler_int_result: public Type_handler_numeric
{
public:
Item_result result_type() const { return INT_RESULT; }
Item_result cmp_type() const { return INT_RESULT; }
virtual ~Type_handler_int_result() {}
const Type_handler *type_handler_for_comparison() const;
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const;
void make_sort_key(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const;
void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const;
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const;
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const;
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const;
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const;
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
longlong Item_func_between_val_int(Item_func_between *func) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
bool Item_func_in_fix_comparator_compatible_types(THD *thd,
Item_func_in *) const;
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_func_plus_fix_length_and_dec(Item_func_plus *) const;
bool Item_func_minus_fix_length_and_dec(Item_func_minus *) const;
bool Item_func_mul_fix_length_and_dec(Item_func_mul *) const;
bool Item_func_div_fix_length_and_dec(Item_func_div *) const;
bool Item_func_mod_fix_length_and_dec(Item_func_mod *) const;
};
class Type_handler_temporal_result: public Type_handler
{
public:
Item_result result_type() const { return STRING_RESULT; }
Item_result cmp_type() const { return TIME_RESULT; }
virtual ~Type_handler_temporal_result() {}
void make_sort_key(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const;
void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
uint32 max_display_length(const Item *item) const;
bool can_change_cond_ref_to_const(Item_bool_func2 *target,
Item *target_expr, Item *target_value,
Item_bool_func2 *source,
Item *source_expr, Item *source_const) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const;
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const;
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const;
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const;
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const;
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
double Item_func_min_max_val_real(Item_func_min_max *) const;
longlong Item_func_min_max_val_int(Item_func_min_max *) const;
my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
my_decimal *) const;
bool Item_func_min_max_get_date(Item_func_min_max*,
MYSQL_TIME *, ulonglong fuzzydate) const;
longlong Item_func_between_val_int(Item_func_between *func) const;
bool Item_func_in_fix_comparator_compatible_types(THD *thd,
Item_func_in *) const;
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_func_plus_fix_length_and_dec(Item_func_plus *) const;
bool Item_func_minus_fix_length_and_dec(Item_func_minus *) const;
bool Item_func_mul_fix_length_and_dec(Item_func_mul *) const;
bool Item_func_div_fix_length_and_dec(Item_func_div *) const;
bool Item_func_mod_fix_length_and_dec(Item_func_mod *) const;
};
class Type_handler_string_result: public Type_handler
{
uint Item_temporal_precision(Item *item, bool is_time) const;
public:
Item_result result_type() const { return STRING_RESULT; }
Item_result cmp_type() const { return STRING_RESULT; }
CHARSET_INFO *charset_for_protocol(const Item *item) const;
virtual ~Type_handler_string_result() {}
const Type_handler *type_handler_for_comparison() const;
const Type_handler *
type_handler_adjusted_to_max_octet_length(uint max_octet_length,
CHARSET_INFO *cs) const;
void make_sort_key(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
Sort_param *param) const;
void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
uint32 max_display_length(const Item *item) const;
uint Item_time_precision(Item *item) const
{
return Item_temporal_precision(item, true);
}
uint Item_datetime_precision(Item *item) const
{
return Item_temporal_precision(item, false);
}
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
String *print_item_value(THD *thd, Item *item, String *str) const
{
return print_item_value_csstr(thd, item, str);
}
bool can_change_cond_ref_to_const(Item_bool_func2 *target,
Item *target_expr, Item *target_value,
Item_bool_func2 *source,
Item *source_expr, Item *source_const) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *,
String *) const;
double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
const;
longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
const;
my_decimal *Item_func_hybrid_field_type_val_decimal(
Item_func_hybrid_field_type *,
my_decimal *) const;
bool Item_func_hybrid_field_type_get_date(Item_func_hybrid_field_type *,
MYSQL_TIME *,
ulonglong fuzzydate) const;
String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
double Item_func_min_max_val_real(Item_func_min_max *) const;
longlong Item_func_min_max_val_int(Item_func_min_max *) const;
my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
my_decimal *) const;
bool Item_func_min_max_get_date(Item_func_min_max*,
MYSQL_TIME *, ulonglong fuzzydate) const;
longlong Item_func_between_val_int(Item_func_between *func) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
bool Item_func_in_fix_comparator_compatible_types(THD *thd,
Item_func_in *) const;
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_func_plus_fix_length_and_dec(Item_func_plus *) const;
bool Item_func_minus_fix_length_and_dec(Item_func_minus *) const;
bool Item_func_mul_fix_length_and_dec(Item_func_mul *) const;
bool Item_func_div_fix_length_and_dec(Item_func_div *) const;
bool Item_func_mod_fix_length_and_dec(Item_func_mod *) const;
};
/***
Instantiable classes for every MYSQL_TYPE_XXX
There are no Type_handler_xxx for the following types:
- MYSQL_TYPE_VAR_STRING (old VARCHAR) - mapped to MYSQL_TYPE_VARSTRING
- MYSQL_TYPE_ENUM - mapped to MYSQL_TYPE_VARSTRING
- MYSQL_TYPE_SET: - mapped to MYSQL_TYPE_VARSTRING
because the functionality that currently uses Type_handler
(e.g. hybrid type functions) does not need to distinguish between
these types and VARCHAR.
For example:
CREATE TABLE t2 AS SELECT COALESCE(enum_column) FROM t1;
creates a VARCHAR column.
There most likely be Type_handler_enum and Type_handler_set later,
when the Type_handler infrastructure gets used in more pieces of the code.
*/
class Type_handler_tiny: public Type_handler_int_result
{
static const Name m_name_tiny;
public:
virtual ~Type_handler_tiny() {}
const Name name() const { return m_name_tiny; }
enum_field_types field_type() const { return MYSQL_TYPE_TINY; }
uint32 max_display_length(const Item *item) const { return 4; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
class Type_handler_short: public Type_handler_int_result
{
static const Name m_name_short;
public:
virtual ~Type_handler_short() {}
const Name name() const { return m_name_short; }
enum_field_types field_type() const { return MYSQL_TYPE_SHORT; }
uint32 max_display_length(const Item *item) const { return 6; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
class Type_handler_long: public Type_handler_int_result
{
static const Name m_name_int;
public:
virtual ~Type_handler_long() {}
const Name name() const { return m_name_int; }
enum_field_types field_type() const { return MYSQL_TYPE_LONG; }
uint32 max_display_length(const Item *item) const
{
return MY_INT32_NUM_DECIMAL_DIGITS;
}
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
class Type_handler_longlong: public Type_handler_int_result
{
static const Name m_name_longlong;
public:
virtual ~Type_handler_longlong() {}
const Name name() const { return m_name_longlong; }
enum_field_types field_type() const { return MYSQL_TYPE_LONGLONG; }
uint32 max_display_length(const Item *item) const { return 20; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
class Type_handler_int24: public Type_handler_int_result
{
static const Name m_name_mediumint;
public:
virtual ~Type_handler_int24() {}
const Name name() const { return m_name_mediumint; }
enum_field_types field_type() const { return MYSQL_TYPE_INT24; }
uint32 max_display_length(const Item *item) const { return 8; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_year: public Type_handler_int_result
{
static const Name m_name_year;
public:
virtual ~Type_handler_year() {}
const Name name() const { return m_name_year; }
enum_field_types field_type() const { return MYSQL_TYPE_YEAR; }
uint32 max_display_length(const Item *item) const;
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_bit: public Type_handler_int_result
{
static const Name m_name_bit;
public:
virtual ~Type_handler_bit() {}
const Name name() const { return m_name_bit; }
enum_field_types field_type() const { return MYSQL_TYPE_BIT; }
uint32 max_display_length(const Item *item) const;
String *print_item_value(THD *thd, Item *item, String *str) const
{
return print_item_value_csstr(thd, item, str);
}
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_float: public Type_handler_real_result
{
static const Name m_name_float;
public:
virtual ~Type_handler_float() {}
const Name name() const { return m_name_float; }
enum_field_types field_type() const { return MYSQL_TYPE_FLOAT; }
uint32 max_display_length(const Item *item) const { return 25; }
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const;
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_double: public Type_handler_real_result
{
static const Name m_name_double;
public:
virtual ~Type_handler_double() {}
const Name name() const { return m_name_double; }
enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
uint32 max_display_length(const Item *item) const { return 53; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_time_common: public Type_handler_temporal_result
{
static const Name m_name_time;
public:
virtual ~Type_handler_time_common() { }
const Name name() const { return m_name_time; }
enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
const Type_handler *type_handler_for_comparison() const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
String *print_item_value(THD *thd, Item *item, String *str) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
};
class Type_handler_time: public Type_handler_time_common
{
public:
virtual ~Type_handler_time() {}
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_time2: public Type_handler_time_common
{
public:
virtual ~Type_handler_time2() {}
enum_field_types real_field_type() const { return MYSQL_TYPE_TIME2; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_temporal_with_date: public Type_handler_temporal_result
{
public:
virtual ~Type_handler_temporal_with_date() {}
const Type_handler *type_handler_for_comparison() const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
};
class Type_handler_date_common: public Type_handler_temporal_with_date
{
static const Name m_name_date;
public:
virtual ~Type_handler_date_common() {}
const Name name() const { return m_name_date; }
enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
String *print_item_value(THD *thd, Item *item, String *str) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
};
class Type_handler_date: public Type_handler_date_common
{
public:
virtual ~Type_handler_date() {}
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_newdate: public Type_handler_date_common
{
public:
virtual ~Type_handler_newdate() {}
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_datetime_common: public Type_handler_temporal_with_date
{
static const Name m_name_datetime;
public:
virtual ~Type_handler_datetime_common() {}
const Name name() const { return m_name_datetime; }
enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
String *print_item_value(THD *thd, Item *item, String *str) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
};
class Type_handler_datetime: public Type_handler_datetime_common
{
public:
virtual ~Type_handler_datetime() {}
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_datetime2: public Type_handler_datetime_common
{
public:
virtual ~Type_handler_datetime2() {}
enum_field_types real_field_type() const { return MYSQL_TYPE_DATETIME2; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_timestamp_common: public Type_handler_temporal_with_date
{
static const Name m_name_timestamp;
public:
virtual ~Type_handler_timestamp_common() {}
const Name name() const { return m_name_timestamp; }
enum_field_types field_type() const { return MYSQL_TYPE_TIMESTAMP; }
String *print_item_value(THD *thd, Item *item, String *str) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
};
class Type_handler_timestamp: public Type_handler_timestamp_common
{
public:
virtual ~Type_handler_timestamp() {}
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_timestamp2: public Type_handler_timestamp_common
{
public:
virtual ~Type_handler_timestamp2() {}
enum_field_types real_field_type() const { return MYSQL_TYPE_TIMESTAMP2; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_olddecimal: public Type_handler_decimal_result
{
static const Name m_name_decimal;
public:
virtual ~Type_handler_olddecimal() {}
const Name name() const { return m_name_decimal; }
enum_field_types field_type() const { return MYSQL_TYPE_DECIMAL; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_newdecimal: public Type_handler_decimal_result
{
static const Name m_name_decimal;
public:
virtual ~Type_handler_newdecimal() {}
const Name name() const { return m_name_decimal; }
enum_field_types field_type() const { return MYSQL_TYPE_NEWDECIMAL; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_null: public Type_handler_string_result
{
static const Name m_name_null;
public:
virtual ~Type_handler_null() {}
const Name name() const { return m_name_null; }
enum_field_types field_type() const { return MYSQL_TYPE_NULL; }
const Type_handler *type_handler_for_comparison() const;
uint32 max_display_length(const Item *item) const { return 0; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_string: public Type_handler_string_result
{
static const Name m_name_char;
public:
virtual ~Type_handler_string() {}
const Name name() const { return m_name_char; }
enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
bool is_param_long_data_type() const { return true; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_varchar: public Type_handler_string_result
{
static const Name m_name_varchar;
public:
virtual ~Type_handler_varchar() {}
const Name name() const { return m_name_varchar; }
enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; }
bool is_param_long_data_type() const { return true; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_blob_common: public Type_handler_string_result
{
public:
virtual ~Type_handler_blob_common() { }
bool is_param_long_data_type() const { return true; }
};
class Type_handler_tiny_blob: public Type_handler_blob_common
{
static const Name m_name_tinyblob;
public:
virtual ~Type_handler_tiny_blob() {}
const Name name() const { return m_name_tinyblob; }
enum_field_types field_type() const { return MYSQL_TYPE_TINY_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_medium_blob: public Type_handler_blob_common
{
static const Name m_name_mediumblob;
public:
virtual ~Type_handler_medium_blob() {}
const Name name() const { return m_name_mediumblob; }
enum_field_types field_type() const { return MYSQL_TYPE_MEDIUM_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_long_blob: public Type_handler_blob_common
{
static const Name m_name_longblob;
public:
virtual ~Type_handler_long_blob() {}
const Name name() const { return m_name_longblob; }
enum_field_types field_type() const { return MYSQL_TYPE_LONG_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_blob: public Type_handler_blob_common
{
static const Name m_name_blob;
public:
virtual ~Type_handler_blob() {}
const Name name() const { return m_name_blob; }
enum_field_types field_type() const { return MYSQL_TYPE_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
#ifdef HAVE_SPATIAL
class Type_handler_geometry: public Type_handler_string_result
{
static const Name m_name_geometry;
public:
virtual ~Type_handler_geometry() {}
const Name name() const { return m_name_geometry; }
enum_field_types field_type() const { return MYSQL_TYPE_GEOMETRY; }
bool is_param_long_data_type() const { return true; }
const Type_handler *type_handler_for_comparison() const;
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
bool is_traditional_type() const
{
return false;
}
bool Item_func_round_fix_length_and_dec(Item_func_round *) const;
bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *) const;
bool Item_func_abs_fix_length_and_dec(Item_func_abs *) const;
bool Item_func_neg_fix_length_and_dec(Item_func_neg *) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
bool Item_func_signed_fix_length_and_dec(Item_func_signed *) const;
bool Item_func_unsigned_fix_length_and_dec(Item_func_unsigned *) const;
bool Item_double_typecast_fix_length_and_dec(Item_double_typecast *) const;
bool Item_decimal_typecast_fix_length_and_dec(Item_decimal_typecast *) const;
bool Item_char_typecast_fix_length_and_dec(Item_char_typecast *) const;
bool Item_time_typecast_fix_length_and_dec(Item_time_typecast *) const;
bool Item_date_typecast_fix_length_and_dec(Item_date_typecast *) const;
bool Item_datetime_typecast_fix_length_and_dec(Item_datetime_typecast *) const;
};
extern Type_handler_geometry type_handler_geometry;
#endif
class Type_handler_enum: public Type_handler_string_result
{
static const Name m_name_enum;
public:
virtual ~Type_handler_enum() {}
const Name name() const { return m_name_enum; }
enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; }
virtual enum_field_types real_field_type() const { return MYSQL_TYPE_ENUM; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
class Type_handler_set: public Type_handler_string_result
{
static const Name m_name_set;
public:
virtual ~Type_handler_set() {}
const Name name() const { return m_name_set; }
enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; }
virtual enum_field_types real_field_type() const { return MYSQL_TYPE_SET; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
/**
A handler for hybrid type functions, e.g.
COALESCE(), IF(), IFNULL(), NULLIF(), CASE,
numeric operators,
UNIX_TIMESTAMP(), TIME_TO_SEC().
Makes sure that field_type(), cmp_type() and result_type()
are always in sync to each other for hybrid functions.
*/
class Type_handler_hybrid_field_type
{
const Type_handler *m_type_handler;
public:
Type_handler_hybrid_field_type();
Type_handler_hybrid_field_type(const Type_handler *handler)
:m_type_handler(handler)
{ }
Type_handler_hybrid_field_type(enum_field_types type)
:m_type_handler(Type_handler::get_handler_by_field_type(type))
{ }
Type_handler_hybrid_field_type(const Type_handler_hybrid_field_type *other)
:m_type_handler(other->m_type_handler)
{ }
const Type_handler *type_handler() const { return m_type_handler; }
enum_field_types field_type() const { return m_type_handler->field_type(); }
enum_field_types real_field_type() const
{
return m_type_handler->real_field_type();
}
Item_result result_type() const { return m_type_handler->result_type(); }
Item_result cmp_type() const { return m_type_handler->cmp_type(); }
void set_handler(const Type_handler *other)
{
m_type_handler= other;
}
const Type_handler *set_handler_by_result_type(Item_result type)
{
return (m_type_handler= Type_handler::get_handler_by_result_type(type));
}
const Type_handler *set_handler_by_cmp_type(Item_result type)
{
return (m_type_handler= Type_handler::get_handler_by_cmp_type(type));
}
const Type_handler *set_handler_by_result_type(Item_result type,
uint max_octet_length,
CHARSET_INFO *cs)
{
m_type_handler= Type_handler::get_handler_by_result_type(type);
return m_type_handler=
m_type_handler->type_handler_adjusted_to_max_octet_length(max_octet_length,
cs);
}
const Type_handler *set_handler_by_field_type(enum_field_types type)
{
return (m_type_handler= Type_handler::get_handler_by_field_type(type));
}
const Type_handler *set_handler_by_real_type(enum_field_types type)
{
return (m_type_handler= Type_handler::get_handler_by_real_type(type));
}
bool aggregate_for_comparison(const Type_handler *other);
bool aggregate_for_comparison(const char *funcname,
Item **items, uint nitems,
bool treat_int_to_uint_as_decimal);
bool aggregate_for_result(const Type_handler *other);
bool aggregate_for_result(const char *funcname,
Item **item, uint nitems, bool treat_bit_as_number);
bool aggregate_for_num_op(const class Type_aggregator *aggregator,
const Type_handler *h0, const Type_handler *h1);
};
extern Type_handler_row type_handler_row;
extern Type_handler_null type_handler_null;
extern Type_handler_string type_handler_string;
extern Type_handler_varchar type_handler_varchar;
extern Type_handler_longlong type_handler_longlong;
extern Type_handler_float type_handler_float;
extern Type_handler_double type_handler_double;
extern Type_handler_newdecimal type_handler_newdecimal;
extern Type_handler_datetime type_handler_datetime;
extern Type_handler_longlong type_handler_longlong;
extern Type_handler_bit type_handler_bit;
extern Type_handler_enum type_handler_enum;
extern Type_handler_set type_handler_set;
extern Type_handler_time2 type_handler_time2;
extern Type_handler_newdate type_handler_newdate;
extern Type_handler_datetime2 type_handler_datetime2;
class Type_aggregator
{
bool m_is_commutative;
class Pair
{
public:
const Type_handler *m_handler1;
const Type_handler *m_handler2;
const Type_handler *m_result;
Pair() { }
Pair(const Type_handler *handler1,
const Type_handler *handler2,
const Type_handler *result)
:m_handler1(handler1), m_handler2(handler2), m_result(result)
{ }
bool eq(const Type_handler *handler1, const Type_handler *handler2) const
{
return m_handler1 == handler1 && m_handler2 == handler2;
}
};
Dynamic_array<Pair> m_array;
const Pair* find_pair(const Type_handler *handler1,
const Type_handler *handler2) const;
public:
Type_aggregator(bool is_commutative= false)
:m_is_commutative(is_commutative)
{ }
bool add(const Type_handler *handler1,
const Type_handler *handler2,
const Type_handler *result)
{
return m_array.append(Pair(handler1, handler2, result));
}
const Type_handler *find_handler(const Type_handler *handler1,
const Type_handler *handler2) const
{
const Pair* el= find_pair(handler1, handler2);
return el ? el->m_result : NULL;
}
bool is_commutative() const { return m_is_commutative; }
};
class Type_aggregator_commutative: public Type_aggregator
{
public:
Type_aggregator_commutative()
:Type_aggregator(true)
{ }
};
class Type_handler_data
{
public:
Type_aggregator_commutative m_type_aggregator_for_result;
Type_aggregator_commutative m_type_aggregator_for_comparison;
Type_aggregator_commutative m_type_aggregator_for_plus;
Type_aggregator_commutative m_type_aggregator_for_mul;
Type_aggregator m_type_aggregator_for_minus;
Type_aggregator m_type_aggregator_for_div;
Type_aggregator m_type_aggregator_for_mod;
#ifndef DBUG_OFF
// This is used for mtr purposes in debug builds
Type_aggregator m_type_aggregator_non_commutative_test;
#endif
bool init();
};
extern Type_handler_data *type_handler_data;
#endif /* SQL_TYPE_H_INCLUDED */
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