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MDEV-9238 Wrap create_virtual_tmp_table() into a class, split into different steps

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This commit is contained in:
Alexander Barkov
2015-12-04 16:38:42 +04:00
parent 1040878233
commit aee068085d
9 changed files with 884 additions and 366 deletions
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111
sql/field.cc
View File

@ -9651,117 +9651,6 @@ void Column_definition::create_length_to_internal_length(void)
}
/**
Init for a tmp table field. To be extended if need be.
*/
void Column_definition::init_for_tmp_table(enum_field_types sql_type_arg,
uint32 length_arg,
uint32 decimals_arg,
bool maybe_null, bool is_unsigned,
uint pack_length_arg)
{
DBUG_ENTER("Create_field::init_for_tmp_table");
field_name= "";
sql_type= sql_type_arg;
char_length= length= length_arg;;
unireg_check= Field::NONE;
interval= 0;
charset= &my_charset_bin;
geom_type= Field::GEOM_GEOMETRY;
DBUG_PRINT("enter", ("sql_type: %d, length: %u, pack_length: %u",
sql_type_arg, length_arg, pack_length_arg));
/*
These pack flags are crafted to get it correctly through the
branches of make_field().
*/
switch (sql_type_arg)
{
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_SET:
pack_flag= 0;
break;
case MYSQL_TYPE_GEOMETRY:
pack_flag= FIELDFLAG_GEOM;
break;
case MYSQL_TYPE_ENUM:
pack_flag= FIELDFLAG_INTERVAL;
break;
case MYSQL_TYPE_NEWDECIMAL:
DBUG_ASSERT(decimals_arg <= DECIMAL_MAX_SCALE);
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
pack_flag= FIELDFLAG_NUMBER |
(decimals_arg & FIELDFLAG_MAX_DEC) << FIELDFLAG_DEC_SHIFT;
break;
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
pack_flag= FIELDFLAG_BLOB;
break;
case MYSQL_TYPE_BIT:
pack_flag= FIELDFLAG_NUMBER | FIELDFLAG_TREAT_BIT_AS_CHAR;
break;
default:
pack_flag= FIELDFLAG_NUMBER;
break;
}
/*
Set the pack flag correctly for the blob-like types. This sets the
packtype to something that make_field can use. If the pack type is
not set correctly, the packlength will be reeeeally wierd (like
129 or so).
*/
switch (sql_type_arg)
{
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_SET:
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_GEOMETRY:
// If you are going to use the above types, you have to pass a
// pack_length as parameter. Assert that is really done.
DBUG_ASSERT(pack_length_arg != ~0U);
pack_flag|= pack_length_to_packflag(pack_length_arg);
break;
default:
/* Nothing */
break;
}
pack_flag|=
(maybe_null ? FIELDFLAG_MAYBE_NULL : 0) |
(is_unsigned ? 0 : FIELDFLAG_DECIMAL);
DBUG_PRINT("debug", ("pack_flag: %s%s%s%s%s%s, pack_type: %d",
FLAGSTR(pack_flag, FIELDFLAG_BINARY),
FLAGSTR(pack_flag, FIELDFLAG_NUMBER),
FLAGSTR(pack_flag, FIELDFLAG_INTERVAL),
FLAGSTR(pack_flag, FIELDFLAG_GEOM),
FLAGSTR(pack_flag, FIELDFLAG_BLOB),
FLAGSTR(pack_flag, FIELDFLAG_DECIMAL),
f_packtype(pack_flag)));
vcol_info= 0;
DBUG_VOID_RETURN;
}
static inline bool is_item_func(Item* x)
{
return x != NULL && x->type() == Item::FUNC_ITEM;

6
sql/field.h
View File

@ -3481,12 +3481,6 @@ public:
Column_definition(THD *thd, Field *field, Field *orig_field);
void create_length_to_internal_length(void);
/* Init for a tmp table field. To be extended if need be. */
void init_for_tmp_table(enum_field_types sql_type_arg,
uint32 max_length, uint32 decimals,
bool maybe_null, bool is_unsigned,
uint pack_length = ~0U);
bool check(THD *thd);
bool stored_in_db() const { return !vcol_info || vcol_info->stored_in_db; }

11
sql/item.h
View File

@ -759,6 +759,17 @@ public:
{
return get_handler_by_field_type(field_type());
}
Field *make_num_distinct_aggregator_field(MEM_ROOT *mem_root,
const Item *item) const
{
return type_handler()->make_num_distinct_aggregator_field(mem_root, this);
}
Field *make_conversion_table_field(TABLE *table,
uint metadata, const Field *target) const
{
DBUG_ASSERT(0); // Should not be called in Item context
return NULL;
}
/* result_type() of an item specifies how the value should be returned */
Item_result result_type() const { return type_handler()->result_type(); }
/* ... while cmp_type() specifies how it should be compared */

43
sql/item_sum.cc
View File

@ -684,32 +684,6 @@ int Aggregator_distinct::composite_key_cmp(void* arg, uchar* key1, uchar* key2)
}
static enum enum_field_types
calc_tmp_field_type(enum enum_field_types table_field_type,
Item_result result_type)
{
/* Adjust tmp table type according to the chosen aggregation type */
switch (result_type) {
case STRING_RESULT:
case REAL_RESULT:
if (table_field_type != MYSQL_TYPE_FLOAT)
table_field_type= MYSQL_TYPE_DOUBLE;
break;
case INT_RESULT:
table_field_type= MYSQL_TYPE_LONGLONG;
/* fallthrough */
case DECIMAL_RESULT:
if (table_field_type != MYSQL_TYPE_LONGLONG)
table_field_type= MYSQL_TYPE_NEWDECIMAL;
break;
case ROW_RESULT:
default:
DBUG_ASSERT(0);
}
return table_field_type;
}
/***************************************************************************/
C_MODE_START
@ -886,8 +860,6 @@ bool Aggregator_distinct::setup(THD *thd)
}
else
{
List<Column_definition> field_list;
Column_definition field_def; /* field definition */
Item *arg;
DBUG_ENTER("Aggregator_distinct::setup");
/* It's legal to call setup() more than once when in a subquery */
@ -899,8 +871,6 @@ bool Aggregator_distinct::setup(THD *thd)
PS/SP. Hence all further allocations are performed in the runtime
mem_root.
*/
if (field_list.push_back(&field_def, thd->mem_root))
DBUG_RETURN(TRUE);
item_sum->null_value= item_sum->maybe_null= 1;
item_sum->quick_group= 0;
@ -918,17 +888,8 @@ bool Aggregator_distinct::setup(THD *thd)
if (always_null)
DBUG_RETURN(FALSE);
enum enum_field_types field_type;
field_type= calc_tmp_field_type(arg->field_type(),
arg->result_type());
field_def.init_for_tmp_table(field_type,
arg->max_length,
arg->decimals,
arg->maybe_null,
arg->unsigned_flag);
if (! (table= create_virtual_tmp_table(thd, field_list)))
Field *field= arg->make_num_distinct_aggregator_field(thd->mem_root, arg);
if (!field || !(table= create_virtual_tmp_table(thd, field)))
DBUG_RETURN(TRUE);
/* XXX: check that the case of CHAR(0) works OK */

148
sql/rpl_utility.cc
View File

@ -922,6 +922,51 @@ table_def::compatible_with(THD *thd, rpl_group_info *rgi,
return true;
}
/**
A wrapper to Virtual_tmp_table, to get access to its constructor,
which is protected for safety purposes (against illegal use on stack).
*/
class Virtual_conversion_table: public Virtual_tmp_table
{
public:
Virtual_conversion_table(THD *thd) :Virtual_tmp_table(thd) { }
/**
Add a new field into the virtual table.
@param sql_type - The real_type of the field.
@param metadata - The RBR binary log metadata for this field.
@param target_field - The field from the target table, to get extra
attributes from (e.g. typelib in case of ENUM).
*/
bool add(enum_field_types sql_type,
uint16 metadata, const Field *target_field)
{
const Type_handler *handler= Type_handler::get_handler_by_real_type(sql_type);
if (!handler)
{
sql_print_error("In RBR mode, Slave received unknown field type field %d "
" for column Name: %s.%s.%s.",
(int) sql_type,
target_field->table->s->db.str,
target_field->table->s->table_name.str,
target_field->field_name);
return true;
}
Field *tmp= handler->make_conversion_table_field(this, metadata,
target_field);
if (!tmp)
return true;
Virtual_tmp_table::add(tmp);
DBUG_PRINT("debug", ("sql_type: %d, target_field: '%s', max_length: %d, decimals: %d,"
" maybe_null: %d, unsigned_flag: %d, pack_length: %u",
sql_type, target_field->field_name,
tmp->field_length, tmp->decimals(), TRUE,
tmp->flags, tmp->pack_length()));
return false;
}
};
/**
Create a conversion table.
@ -937,8 +982,7 @@ TABLE *table_def::create_conversion_table(THD *thd, rpl_group_info *rgi,
{
DBUG_ENTER("table_def::create_conversion_table");
List<Column_definition> field_list;
TABLE *conv_table= NULL;
Virtual_conversion_table *conv_table;
Relay_log_info *rli= rgi->rli;
/*
At slave, columns may differ. So we should create
@ -946,101 +990,35 @@ TABLE *table_def::create_conversion_table(THD *thd, rpl_group_info *rgi,
conversion table.
*/
uint const cols_to_create= MY_MIN(target_table->s->fields, size());
if (!(conv_table= new(thd) Virtual_conversion_table(thd)) ||
conv_table->init(cols_to_create))
goto err;
for (uint col= 0 ; col < cols_to_create; ++col)
{
Column_definition *field_def=
(Create_field*) alloc_root(thd->mem_root, sizeof(Create_field));
bool unsigned_flag= 0;
if (field_list.push_back(field_def, thd->mem_root))
DBUG_RETURN(NULL);
uint decimals= 0;
TYPELIB* interval= NULL;
uint pack_length= 0;
uint32 max_length=
max_display_length_for_field(type(col), field_metadata(col));
switch(type(col)) {
int precision;
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_SET:
interval= static_cast<Field_enum*>(target_table->field[col])->typelib;
pack_length= field_metadata(col) & 0x00ff;
break;
case MYSQL_TYPE_NEWDECIMAL:
/*
The display length of a DECIMAL type is not the same as the
length that should be supplied to make_field, so we correct
the length here.
*/
precision= field_metadata(col) >> 8;
decimals= field_metadata(col) & 0x00ff;
max_length=
my_decimal_precision_to_length(precision, decimals, FALSE);
break;
case MYSQL_TYPE_DECIMAL:
sql_print_error("In RBR mode, Slave received incompatible DECIMAL field "
"(old-style decimal field) from Master while creating "
"conversion table. Please consider changing datatype on "
"Master to new style decimal by executing ALTER command for"
" column Name: %s.%s.%s.",
target_table->s->db.str,
target_table->s->table_name.str,
target_table->field[col]->field_name);
if (conv_table->add(type(col), field_metadata(col),
target_table->field[col]))
{
DBUG_PRINT("debug", ("binlog_type: %d, metadata: %04X, target_field: '%s'"
" make_conversion_table_field() failed",
binlog_type(col), field_metadata(col),
target_table->field[col]->field_name));
goto err;
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_GEOMETRY:
pack_length= field_metadata(col) & 0x00ff;
break;
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
/*
As we don't know if the integer was signed or not on the master,
assume we have same sign on master and slave. This is true when not
using conversions so it should be true also when using conversions.
*/
unsigned_flag= ((Field_num*) target_table->field[col])->unsigned_flag;
break;
default:
break;
}
}
DBUG_PRINT("debug", ("sql_type: %d, target_field: '%s', max_length: %d, decimals: %d,"
" maybe_null: %d, unsigned_flag: %d, pack_length: %u",
binlog_type(col), target_table->field[col]->field_name,
max_length, decimals, TRUE, unsigned_flag,
pack_length));
field_def->init_for_tmp_table(type(col),
max_length,
decimals,
TRUE, // maybe_null
unsigned_flag,
pack_length);
field_def->charset= target_table->field[col]->charset();
field_def->interval= interval;
}
if (conv_table->open())
goto err; // Could not allocate record buffer?
conv_table= create_virtual_tmp_table(thd, field_list);
DBUG_RETURN(conv_table);
err:
if (conv_table == NULL)
{
if (conv_table)
delete conv_table;
rli->report(ERROR_LEVEL, ER_SLAVE_CANT_CREATE_CONVERSION, rgi->gtid_info(),
ER_THD(thd, ER_SLAVE_CANT_CREATE_CONVERSION),
target_table->s->db.str,
target_table->s->table_name.str);
}
DBUG_RETURN(conv_table);
DBUG_RETURN(NULL);
}
#endif /* MYSQL_CLIENT */

154
sql/sql_select.cc
View File

@ -16016,9 +16016,9 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
a tmp_set bitmap to be used by things like filesort.
*/
void setup_tmp_table_column_bitmaps(TABLE *table, uchar *bitmaps)
void
setup_tmp_table_column_bitmaps(TABLE *table, uchar *bitmaps, uint field_count)
{
uint field_count= table->s->fields;
uint bitmap_size= bitmap_buffer_size(field_count);
DBUG_ASSERT(table->s->vfields == 0 && table->def_vcol_set == 0);
@ -16042,6 +16042,13 @@ void setup_tmp_table_column_bitmaps(TABLE *table, uchar *bitmaps)
}
void
setup_tmp_table_column_bitmaps(TABLE *table, uchar *bitmaps)
{
setup_tmp_table_column_bitmaps(table, bitmaps, table->s->fields);
}
/**
Create a temp table according to a field list.
@ -16926,105 +16933,59 @@ err:
/****************************************************************************/
/**
Create a reduced TABLE object with properly set up Field list from a
list of field definitions.
The created table doesn't have a table handler associated with
it, has no keys, no group/distinct, no copy_funcs array.
The sole purpose of this TABLE object is to use the power of Field
class to read/write data to/from table->record[0]. Then one can store
the record in any container (RB tree, hash, etc).
The table is created in THD mem_root, so are the table's fields.
Consequently, if you don't BLOB fields, you don't need to free it.
@param thd connection handle
@param field_list list of column definitions
@return
0 if out of memory, TABLE object in case of success
*/
TABLE *create_virtual_tmp_table(THD *thd, List<Column_definition> &field_list)
void *Virtual_tmp_table::operator new(size_t size, THD *thd) throw()
{
return (Virtual_tmp_table *) alloc_root(thd->mem_root, size);
}
bool Virtual_tmp_table::init(uint field_count)
{
uint field_count= field_list.elements;
uint blob_count= 0;
Field **field;
Column_definition *cdef; /* column definition */
uint record_length= 0;
uint null_count= 0; /* number of columns which may be null */
uint null_pack_length; /* NULL representation array length */
uint *blob_field;
uchar *bitmaps;
TABLE *table;
TABLE_SHARE *share;
if (!multi_alloc_root(thd->mem_root,
&table, sizeof(*table),
&share, sizeof(*share),
if (!multi_alloc_root(in_use->mem_root,
&s, sizeof(*s),
&field, (field_count + 1) * sizeof(Field*),
&blob_field, (field_count+1) *sizeof(uint),
&bitmaps, bitmap_buffer_size(field_count)*5,
&blob_field, (field_count + 1) * sizeof(uint),
&bitmaps, bitmap_buffer_size(field_count) * 5,
NullS))
return 0;
return true;
bzero(s, sizeof(*s));
s->blob_field= blob_field;
setup_tmp_table_column_bitmaps(this, bitmaps, field_count);
m_alloced_field_count= field_count;
return false;
};
bzero(table, sizeof(*table));
bzero(share, sizeof(*share));
table->field= field;
table->s= share;
table->temp_pool_slot= MY_BIT_NONE;
share->blob_field= blob_field;
share->fields= field_count;
setup_tmp_table_column_bitmaps(table, bitmaps);
bool Virtual_tmp_table::add(List<Column_definition> &field_list)
{
/* Create all fields and calculate the total length of record */
Column_definition *cdef; /* column definition */
List_iterator_fast<Column_definition> it(field_list);
while ((cdef= it++))
for ( ; (cdef= it++); )
{
*field= cdef->make_field(share, thd->mem_root, 0,
Field *tmp;
if (!(tmp= cdef->make_field(s, in_use->mem_root, 0,
(uchar*) (f_maybe_null(cdef->pack_flag) ? "" : 0),
f_maybe_null(cdef->pack_flag) ? 1 : 0,
cdef->field_name);
if (!*field)
goto error;
(*field)->init(table);
record_length+= (*field)->pack_length();
if (! ((*field)->flags & NOT_NULL_FLAG))
null_count++;
if ((*field)->flags & BLOB_FLAG)
share->blob_field[blob_count++]= (uint) (field - table->field);
field++;
cdef->field_name)))
return true;
add(tmp);
}
*field= NULL; /* mark the end of the list */
share->blob_field[blob_count]= 0; /* mark the end of the list */
share->blob_fields= blob_count;
return false;
}
null_pack_length= (null_count + 7)/8;
share->reclength= record_length + null_pack_length;
share->rec_buff_length= ALIGN_SIZE(share->reclength + 1);
table->record[0]= (uchar*) thd->alloc(share->rec_buff_length);
if (!table->record[0])
goto error;
if (null_pack_length)
{
table->null_flags= (uchar*) table->record[0];
share->null_fields= null_count;
share->null_bytes= share->null_bytes_for_compare= null_pack_length;
}
table->in_use= thd; /* field->reset() may access table->in_use */
{
/* Set up field pointers */
uchar *null_pos= table->record[0];
uchar *field_pos= null_pos + share->null_bytes;
void Virtual_tmp_table::setup_field_pointers()
{
uchar *null_pos= record[0];
uchar *field_pos= null_pos + s->null_bytes;
uint null_bit= 1;
for (field= table->field; *field; ++field)
for (Field **cur_ptr= field; *cur_ptr; ++cur_ptr)
{
Field *cur_field= *field;
Field *cur_field= *cur_ptr;
if ((cur_field->flags & NOT_NULL_FLAG))
cur_field->move_field(field_pos);
else
@ -17050,15 +17011,30 @@ TABLE *create_virtual_tmp_table(THD *thd, List<Column_definition> &field_list)
}
}
cur_field->reset();
field_pos+= cur_field->pack_length();
}
}
bool Virtual_tmp_table::open()
{
// Make sure that we added all the fields we planned to:
DBUG_ASSERT(s->fields == m_alloced_field_count);
field[s->fields]= NULL; // mark the end of the list
s->blob_field[s->blob_fields]= 0; // mark the end of the list
uint null_pack_length= (s->null_fields + 7) / 8; // NULL-bit array length
s->reclength+= null_pack_length;
s->rec_buff_length= ALIGN_SIZE(s->reclength + 1);
if (!(record[0]= (uchar*) in_use->alloc(s->rec_buff_length)))
return true;
if (null_pack_length)
{
null_flags= (uchar*) record[0];
s->null_bytes= s->null_bytes_for_compare= null_pack_length;
}
return table;
error:
for (field= table->field; *field; ++field)
delete *field; /* just invokes field destructor */
return 0;
setup_field_pointers();
return false;
}

175
sql/sql_select.h
View File

@ -1861,7 +1861,180 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
All methods presume that there is at least one field to change.
*/
TABLE *create_virtual_tmp_table(THD *thd, List<Column_definition> &field_list);
class Virtual_tmp_table: public TABLE
{
/**
Destruct collected fields. This method is called on errors only,
when we could not make the virtual temporary table completely,
e.g. when some of the fields could not be created or added.
This is needed to avoid memory leaks, as some fields can be BLOB
variants and thus can have String onboard. Strings must be destructed
as they store data not the heap (not on MEM_ROOT).
*/
void destruct_fields()
{
for (uint i= 0; i < s->fields; i++)
delete field[i]; // to invoke the field destructor
s->fields= 0; // safety
}
protected:
/**
The number of the fields that are going to be in the table.
We remember the number of the fields at init() time, and
at open() we check that all of the fields were really added.
*/
uint m_alloced_field_count;
/**
Setup field pointers and null-bit pointers.
*/
void setup_field_pointers();
public:
/**
Create a new empty virtual temporary table on the thread mem_root.
After creation, the caller must:
- call init()
- populate the table with new fields using add().
- call open().
@param thd - Current thread.
*/
static void *operator new(size_t size, THD *thd) throw();
Virtual_tmp_table(THD *thd)
{
bzero(this, sizeof(*this));
temp_pool_slot= MY_BIT_NONE;
in_use= thd;
}
~Virtual_tmp_table()
{
destruct_fields();
}
/**
Allocate components for the given number of fields.
- fields[]
- s->blob_fields[],
- bitmaps: def_read_set, def_write_set, tmp_set, eq_join_set, cond_set.
@param field_count - The number of fields we plan to add to the table.
@returns false - on success.
@returns true - on error.
*/
bool init(uint field_count);
/**
Add one Field to the end of the field array, update members:
s->reclength, s->fields, s->blob_fields, s->null_fuelds.
*/
bool add(Field *new_field)
{
DBUG_ASSERT(s->fields < m_alloced_field_count);
new_field->init(this);
field[s->fields]= new_field;
s->reclength+= new_field->pack_length();
if (!(new_field->flags & NOT_NULL_FLAG))
s->null_fields++;
if (new_field->flags & BLOB_FLAG)
{
// Note, s->blob_fields was incremented in Field_blob::Field_blob
DBUG_ASSERT(s->blob_fields);
DBUG_ASSERT(s->blob_fields <= m_alloced_field_count);
s->blob_field[s->blob_fields - 1]= s->fields;
}
s->fields++;
return false;
}
/**
Add fields from a Column_definition list
@returns false - on success.
@returns true - on error.
*/
bool add(List<Column_definition> &field_list);
/**
Open a virtual table for read/write:
- Setup end markers in TABLE::field and TABLE_SHARE::blob_fields,
- Allocate a buffer in TABLE::record[0].
- Set field pointers (Field::ptr, Field::null_pos, Field::null_bit) to
the allocated record.
This method is called when all of the fields have been added to the table.
After calling this method the table is ready for read and write operations.
@return false - on success
@return true - on error (e.g. could not allocate the record buffer).
*/
bool open();
};
/**
Create a reduced TABLE object with properly set up Field list from a
list of field definitions.
The created table doesn't have a table handler associated with
it, has no keys, no group/distinct, no copy_funcs array.
The sole purpose of this TABLE object is to use the power of Field
class to read/write data to/from table->record[0]. Then one can store
the record in any container (RB tree, hash, etc).
The table is created in THD mem_root, so are the table's fields.
Consequently, if you don't BLOB fields, you don't need to free it.
@param thd connection handle
@param field_list list of column definitions
@return
0 if out of memory, or a
TABLE object ready for read and write in case of success
*/
inline TABLE *
create_virtual_tmp_table(THD *thd, List<Column_definition> &field_list)
{
Virtual_tmp_table *table;
if (!(table= new(thd) Virtual_tmp_table(thd)))
return NULL;
if (table->init(field_list.elements) ||
table->add(field_list) ||
table->open())
{
delete table;
return NULL;
}
return table;
}
/**
Create a new virtual temporary table consisting of a single field.
SUM(DISTINCT expr) and similar numeric aggregate functions use this.
@param thd - Current thread
@param field - The field that will be added into the table.
@return NULL - On error.
@return !NULL - A pointer to the created table that is ready
for read and write.
*/
inline TABLE *
create_virtual_tmp_table(THD *thd, Field *field)
{
Virtual_tmp_table *table;
DBUG_ASSERT(field);
if (!(table= new(thd) Virtual_tmp_table(thd)))
return NULL;
if (table->init(1) ||
table->add(field) ||
table->open())
{
delete table;
return NULL;
}
return table;
}
int test_if_item_cache_changed(List<Cached_item> &list);
int join_init_read_record(JOIN_TAB *tab);

424
sql/sql_type.cc
View File

@ -16,6 +16,9 @@
#include "sql_type.h"
#include "sql_const.h"
#include "sql_class.h"
#include "item.h"
#include "log.h"
static Type_handler_tiny type_handler_tiny;
static Type_handler_short type_handler_short;
@ -220,3 +223,424 @@ Type_handler::get_handler_by_real_type(enum_field_types type)
return &type_handler_string;
}
/**
Create a DOUBLE field by default.
*/
Field *
Type_handler::make_num_distinct_aggregator_field(MEM_ROOT *mem_root,
const Item *item) const
{
return new(mem_root)
Field_double(NULL, item->max_length,
(uchar *) (item->maybe_null ? "" : 0),
item->maybe_null ? 1 : 0, Field::NONE,
item->name, item->decimals, 0, item->unsigned_flag);
}
Field *
Type_handler_float::make_num_distinct_aggregator_field(MEM_ROOT *mem_root,
const Item *item)
const
{
return new(mem_root)
Field_float(NULL, item->max_length,
(uchar *) (item->maybe_null ? "" : 0),
item->maybe_null ? 1 : 0, Field::NONE,
item->name, item->decimals, 0, item->unsigned_flag);
}
Field *
Type_handler_decimal_result::make_num_distinct_aggregator_field(
MEM_ROOT *mem_root,
const Item *item)
const
{
DBUG_ASSERT(item->decimals <= DECIMAL_MAX_SCALE);
return new (mem_root)
Field_new_decimal(NULL, item->max_length,
(uchar *) (item->maybe_null ? "" : 0),
item->maybe_null ? 1 : 0, Field::NONE,
item->name, item->decimals, 0, item->unsigned_flag);
}
Field *
Type_handler_int_result::make_num_distinct_aggregator_field(MEM_ROOT *mem_root,
const Item *item)
const
{
/**
Make a longlong field for all INT-alike types. It could create
smaller fields for TINYINT, SMALLINT, MEDIUMINT, INT though.
*/
return new(mem_root)
Field_longlong(NULL, item->max_length,
(uchar *) (item->maybe_null ? "" : 0),
item->maybe_null ? 1 : 0, Field::NONE,
item->name, 0, item->unsigned_flag);
}
/***********************************************************************/
#define TMPNAME ""
Field *Type_handler_tiny::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
/*
As we don't know if the integer was signed or not on the master,
assume we have same sign on master and slave. This is true when not
using conversions so it should be true also when using conversions.
*/
bool unsigned_flag= ((Field_num*) target)->unsigned_flag;
return new (table->in_use->mem_root)
Field_tiny(NULL, 4 /*max_length*/, (uchar *) "", 1, Field::NONE,
TMPNAME, 0/*zerofill*/, unsigned_flag);
}
Field *Type_handler_short::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
bool unsigned_flag= ((Field_num*) target)->unsigned_flag;
return new (table->in_use->mem_root)
Field_short(NULL, 6 /*max_length*/, (uchar *) "", 1, Field::NONE,
TMPNAME, 0/*zerofill*/, unsigned_flag);
}
Field *Type_handler_int24::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
bool unsigned_flag= ((Field_num*) target)->unsigned_flag;
return new (table->in_use->mem_root)
Field_medium(NULL, 9 /*max_length*/, (uchar *) "", 1, Field::NONE,
TMPNAME, 0/*zerofill*/, unsigned_flag);
}
Field *Type_handler_long::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
bool unsigned_flag= ((Field_num*) target)->unsigned_flag;
return new (table->in_use->mem_root)
Field_long(NULL, 11 /*max_length*/, (uchar *) "", 1, Field::NONE,
TMPNAME, 0/*zerofill*/, unsigned_flag);
}
Field *Type_handler_longlong::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
bool unsigned_flag= ((Field_num*) target)->unsigned_flag;
return new (table->in_use->mem_root)
Field_longlong(NULL, 20 /*max_length*/,(uchar *) "", 1, Field::NONE,
TMPNAME, 0/*zerofill*/, unsigned_flag);
}
Field *Type_handler_float::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new (table->in_use->mem_root)
Field_float(NULL, 12 /*max_length*/, (uchar *) "", 1, Field::NONE,
TMPNAME, 0/*dec*/, 0/*zerofill*/, 0/*unsigned_flag*/);
}
Field *Type_handler_double::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new (table->in_use->mem_root)
Field_double(NULL, 22 /*max_length*/, (uchar *) "", 1, Field::NONE,
TMPNAME, 0/*dec*/, 0/*zerofill*/, 0/*unsigned_flag*/);
}
Field *Type_handler_newdecimal::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
int precision= metadata >> 8;
uint decimals= metadata & 0x00ff;
uint32 max_length= my_decimal_precision_to_length(precision, decimals, false);
DBUG_ASSERT(decimals <= DECIMAL_MAX_SCALE);
return new (table->in_use->mem_root)
Field_new_decimal(NULL, max_length, (uchar *) "", 1, Field::NONE,
TMPNAME, decimals, 0/*zerofill*/, 0/*unsigned*/);
}
Field *Type_handler_olddecimal::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
sql_print_error("In RBR mode, Slave received incompatible DECIMAL field "
"(old-style decimal field) from Master while creating "
"conversion table. Please consider changing datatype on "
"Master to new style decimal by executing ALTER command for"
" column Name: %s.%s.%s.",
target->table->s->db.str,
target->table->s->table_name.str,
target->field_name);
return NULL;
}
Field *Type_handler_year::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_year(NULL, 4, (uchar *) "", 1, Field::NONE, TMPNAME);
}
Field *Type_handler_null::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_null(NULL, 0, Field::NONE, TMPNAME, target->charset());
}
Field *Type_handler_timestamp::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
// We assume TIMESTAMP(0)
return new(table->in_use->mem_root)
Field_timestamp(NULL, MAX_DATETIME_WIDTH, (uchar *) "", 1,
Field::NONE, TMPNAME, table->s);
}
Field *Type_handler_timestamp2::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_timestampf(NULL, (uchar *) "", 1, Field::NONE,
TMPNAME, table->s, metadata);
}
Field *Type_handler_newdate::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_newdate(NULL, (uchar *) "", 1, Field::NONE, TMPNAME);
}
Field *Type_handler_date::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_date(NULL, (uchar *) "", 1, Field::NONE, TMPNAME);
}
Field *Type_handler_time::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_time(NULL, MAX_TIME_WIDTH, (uchar *) "", 1,
Field::NONE, TMPNAME);
}
Field *Type_handler_time2::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_timef(NULL, (uchar *) "", 1, Field::NONE, TMPNAME, metadata);
}
Field *Type_handler_datetime::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_datetime(NULL, MAX_DATETIME_WIDTH, (uchar *) "", 1,
Field::NONE, TMPNAME);
}
Field *Type_handler_datetime2::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_datetimef(NULL, (uchar *) "", 1,
Field::NONE, TMPNAME, metadata);
}
Field *Type_handler_bit::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
DBUG_ASSERT((metadata & 0xff) <= 7);
uint32 max_length= 8 * (metadata >> 8U) + (metadata & 0x00ff);
return new(table->in_use->mem_root)
Field_bit_as_char(NULL, max_length, (uchar *) "", 1,
Field::NONE, TMPNAME);
}
Field *Type_handler_string::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
/* This is taken from Field_string::unpack. */
uint32 max_length= (((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0x00ff);
return new(table->in_use->mem_root)
Field_string(NULL, max_length, (uchar *) "", 1,
Field::NONE, TMPNAME, target->charset());
}
Field *Type_handler_varchar::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_varstring(NULL, metadata, HA_VARCHAR_PACKLENGTH(metadata),
(uchar *) "", 1, Field::NONE, TMPNAME,
table->s, target->charset());
}
Field *Type_handler_tiny_blob::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_blob(NULL, (uchar *) "", 1, Field::NONE, TMPNAME,
table->s, 1, target->charset());
}
Field *Type_handler_blob::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_blob(NULL, (uchar *) "", 1, Field::NONE, TMPNAME,
table->s, 2, target->charset());
}
Field *Type_handler_medium_blob::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_blob(NULL, (uchar *) "", 1, Field::NONE, TMPNAME,
table->s, 3, target->charset());
}
Field *Type_handler_long_blob::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
return new(table->in_use->mem_root)
Field_blob(NULL, (uchar *) "", 1, Field::NONE, TMPNAME,
table->s, 4, target->charset());
}
#ifdef HAVE_SPATIAL
Field *Type_handler_geometry::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
DBUG_ASSERT(target->type() == MYSQL_TYPE_GEOMETRY);
/*
We do not do not update feature_gis statistics here:
status_var_increment(target->table->in_use->status_var.feature_gis);
as this is only a temporary field.
The statistics was already incremented when "target" was created.
*/
return new(table->in_use->mem_root)
Field_geom(NULL, (uchar *) "", 1, Field::NONE, TMPNAME, table->s, 4,
((const Field_geom*) target)->geom_type,
((const Field_geom*) target)->srid);
}
#endif
Field *Type_handler_enum::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
DBUG_ASSERT(target->type() == MYSQL_TYPE_STRING);
DBUG_ASSERT(target->real_type() == MYSQL_TYPE_ENUM);
return new(table->in_use->mem_root)
Field_enum(NULL, target->field_length,
(uchar *) "", 1, Field::NONE, TMPNAME,
metadata & 0x00ff/*pack_length()*/,
((const Field_enum*) target)->typelib, target->charset());
}
Field *Type_handler_set::make_conversion_table_field(TABLE *table,
uint metadata,
const Field *target)
const
{
DBUG_ASSERT(target->type() == MYSQL_TYPE_STRING);
DBUG_ASSERT(target->real_type() == MYSQL_TYPE_SET);
return new(table->in_use->mem_root)
Field_set(NULL, target->field_length,
(uchar *) "", 1, Field::NONE, TMPNAME,
metadata & 0x00ff/*pack_length()*/,
((const Field_enum*) target)->typelib, target->charset());
}

114
sql/sql_type.h
View File

@ -23,6 +23,10 @@
#include "mysqld.h"
class Field;
class Item;
struct TABLE;
class Type_handler
{
protected:
@ -39,6 +43,42 @@ public:
CHARSET_INFO *cs) const
{ return this; }
virtual ~Type_handler() {}
/**
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;
};
@ -59,6 +99,7 @@ public:
Item_result result_type() const { return DECIMAL_RESULT; }
Item_result cmp_type() const { return DECIMAL_RESULT; }
virtual ~Type_handler_decimal_result() {};
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const;
};
@ -68,6 +109,7 @@ public:
Item_result result_type() const { return INT_RESULT; }
Item_result cmp_type() const { return INT_RESULT; }
virtual ~Type_handler_int_result() {}
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const;
};
@ -117,6 +159,8 @@ class Type_handler_tiny: public Type_handler_int_result
public:
virtual ~Type_handler_tiny() {}
enum_field_types field_type() const { return MYSQL_TYPE_TINY; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
@ -125,6 +169,8 @@ class Type_handler_short: public Type_handler_int_result
public:
virtual ~Type_handler_short() {}
enum_field_types field_type() const { return MYSQL_TYPE_SHORT; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
@ -133,6 +179,8 @@ class Type_handler_long: public Type_handler_int_result
public:
virtual ~Type_handler_long() {}
enum_field_types field_type() const { return MYSQL_TYPE_LONG; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
@ -141,6 +189,8 @@ class Type_handler_longlong: public Type_handler_int_result
public:
virtual ~Type_handler_longlong() {}
enum_field_types field_type() const { return MYSQL_TYPE_LONGLONG; }
Field *make_conversion_table_field(TABLE *TABLE, uint metadata,
const Field *target) const;
};
@ -149,6 +199,8 @@ class Type_handler_int24: public Type_handler_int_result
public:
virtual ~Type_handler_int24() {}
enum_field_types field_type() const { return MYSQL_TYPE_INT24; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -157,6 +209,8 @@ class Type_handler_year: public Type_handler_int_result
public:
virtual ~Type_handler_year() {}
enum_field_types field_type() const { return MYSQL_TYPE_YEAR; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -165,6 +219,8 @@ class Type_handler_bit: public Type_handler_int_result
public:
virtual ~Type_handler_bit() {}
enum_field_types field_type() const { return MYSQL_TYPE_BIT; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -173,6 +229,9 @@ class Type_handler_float: public Type_handler_real_result
public:
virtual ~Type_handler_float() {}
enum_field_types field_type() const { return MYSQL_TYPE_FLOAT; }
Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const;
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -181,6 +240,8 @@ class Type_handler_double: public Type_handler_real_result
public:
virtual ~Type_handler_double() {}
enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -189,6 +250,8 @@ class Type_handler_time: public Type_handler_temporal_result
public:
virtual ~Type_handler_time() {}
enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -198,6 +261,8 @@ public:
virtual ~Type_handler_time2() {}
enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
enum_field_types real_field_type() const { return MYSQL_TYPE_TIME2; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -206,6 +271,8 @@ class Type_handler_date: public Type_handler_temporal_result
public:
virtual ~Type_handler_date() {}
enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -214,7 +281,8 @@ class Type_handler_newdate: public Type_handler_temporal_result
public:
virtual ~Type_handler_newdate() {}
enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
enum_field_types real_field_type() const { return MYSQL_TYPE_NEWDATE; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -223,6 +291,8 @@ class Type_handler_datetime: public Type_handler_temporal_result
public:
virtual ~Type_handler_datetime() {}
enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -232,6 +302,8 @@ public:
virtual ~Type_handler_datetime2() {}
enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
enum_field_types real_field_type() const { return MYSQL_TYPE_DATETIME2; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -240,6 +312,8 @@ class Type_handler_timestamp: public Type_handler_temporal_result
public:
virtual ~Type_handler_timestamp() {}
enum_field_types field_type() const { return MYSQL_TYPE_TIMESTAMP; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -249,6 +323,8 @@ public:
virtual ~Type_handler_timestamp2() {}
enum_field_types field_type() const { return MYSQL_TYPE_TIMESTAMP; }
enum_field_types real_field_type() const { return MYSQL_TYPE_TIMESTAMP2; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -257,6 +333,8 @@ class Type_handler_olddecimal: public Type_handler_decimal_result
public:
virtual ~Type_handler_olddecimal() {}
enum_field_types field_type() const { return MYSQL_TYPE_DECIMAL; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -265,6 +343,8 @@ class Type_handler_newdecimal: public Type_handler_decimal_result
public:
virtual ~Type_handler_newdecimal() {}
enum_field_types field_type() const { return MYSQL_TYPE_NEWDECIMAL; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -273,6 +353,8 @@ class Type_handler_null: public Type_handler_string_result
public:
virtual ~Type_handler_null() {}
enum_field_types field_type() const { return MYSQL_TYPE_NULL; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -281,6 +363,8 @@ class Type_handler_string: public Type_handler_string_result
public:
virtual ~Type_handler_string() {}
enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -289,6 +373,8 @@ class Type_handler_varchar: public Type_handler_string_result
public:
virtual ~Type_handler_varchar() {}
enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -297,6 +383,8 @@ class Type_handler_tiny_blob: public Type_handler_string_result
public:
virtual ~Type_handler_tiny_blob() {}
enum_field_types field_type() const { return MYSQL_TYPE_TINY_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -305,6 +393,8 @@ class Type_handler_medium_blob: public Type_handler_string_result
public:
virtual ~Type_handler_medium_blob() {}
enum_field_types field_type() const { return MYSQL_TYPE_MEDIUM_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -313,6 +403,8 @@ class Type_handler_long_blob: public Type_handler_string_result
public:
virtual ~Type_handler_long_blob() {}
enum_field_types field_type() const { return MYSQL_TYPE_LONG_BLOB; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
@ -321,15 +413,21 @@ class Type_handler_blob: public Type_handler_string_result
public:
virtual ~Type_handler_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
{
public:
virtual ~Type_handler_geometry() {}
enum_field_types field_type() const { return MYSQL_TYPE_GEOMETRY; }
Field *make_conversion_table_field(TABLE *, uint metadata,
const Field *target) const;
};
#endif
class Type_handler_enum: public Type_handler_string_result
@ -338,6 +436,8 @@ public:
virtual ~Type_handler_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;
};
@ -347,6 +447,8 @@ public:
virtual ~Type_handler_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;
};
@ -414,6 +516,16 @@ public:
m_type_handler->type_handler_adjusted_to_max_octet_length(max_octet_length,
cs);
}
Field *make_num_distinct_aggregator_field(MEM_ROOT *mem_root,
const Item *item) const
{
return m_type_handler->make_num_distinct_aggregator_field(mem_root, item);
}
Field *make_conversion_table_field(TABLE *table, uint metadata,
const Field *target) const
{
return m_type_handler->make_conversion_table_field(table, metadata, target);
}
};