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/*
Copyright (c) 2000, 2011, Oracle and/or its affiliates
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 02110-1335 USA */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
/* class for the the myisam merge handler */
#include <myisammrg.h>
/**
Represents one name of a MERGE child.
@todo: Add MYRG_SHARE and store chlidren names in the
share.
*/
class Mrg_child_def: public Sql_alloc
{
/* Remembered MERGE child def version. See top comment in ha_myisammrg.cc */
enum_table_ref_type m_child_table_ref_type;
ulong m_child_def_version;
public:
LEX_STRING db;
LEX_STRING name;
/* Access MERGE child def version. See top comment in ha_myisammrg.cc */
inline enum_table_ref_type get_child_table_ref_type()
{
return m_child_table_ref_type;
}
inline ulong get_child_def_version()
{
return m_child_def_version;
}
inline void set_child_def_version(enum_table_ref_type child_table_ref_type,
ulong version)
{
m_child_table_ref_type= child_table_ref_type;
m_child_def_version= version;
}
Mrg_child_def(char *db_arg, size_t db_len_arg,
char *table_name_arg, size_t table_name_len_arg)
{
db.str= db_arg;
db.length= db_len_arg;
name.str= table_name_arg;
name.length= table_name_len_arg;
m_child_def_version= ~0UL;
m_child_table_ref_type= TABLE_REF_NULL;
}
};
class ha_myisammrg final : public handler
{
MYRG_INFO *file;
my_bool is_cloned; /* This instance has been cloned */
public:
MEM_ROOT children_mem_root; /* mem root for children list */
List<Mrg_child_def> child_def_list;
TABLE_LIST *children_l; /* children list */
TABLE_LIST **children_last_l; /* children list end */
uint test_if_locked; /* flags from ::open() */
ha_myisammrg(handlerton *hton, TABLE_SHARE *table_arg);
~ha_myisammrg();
const char *index_type(uint key_number) override;
ulonglong table_flags() const override
{
return (HA_REC_NOT_IN_SEQ | HA_AUTO_PART_KEY | HA_NO_TRANSACTIONS |
HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
HA_NULL_IN_KEY | HA_CAN_INDEX_BLOBS | HA_FILE_BASED |
HA_ANY_INDEX_MAY_BE_UNIQUE | HA_CAN_BIT_FIELD |
HA_HAS_RECORDS | HA_CAN_EXPORT |
HA_NO_COPY_ON_ALTER |
HA_DUPLICATE_POS | HA_CAN_MULTISTEP_MERGE);
}
ulong index_flags(uint inx, uint part, bool all_parts) const override
{
return ((table_share->key_info[inx].algorithm == HA_KEY_ALG_FULLTEXT) ?
0 : HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE |
HA_READ_ORDER | HA_KEYREAD_ONLY);
}
uint max_supported_keys() const override { return MI_MAX_KEY; }
uint max_supported_key_length() const override { return HA_MAX_KEY_LENGTH; }
uint max_supported_key_part_length() const override
{ return HA_MAX_KEY_LENGTH; }
IO_AND_CPU_COST scan_time() override
{
IO_AND_CPU_COST cost;
cost.io= (ulonglong2double(stats.data_file_length) / IO_SIZE +
file->tables),
cost.cpu= records() * ROW_NEXT_FIND_COST;
return cost;
}
IO_AND_CPU_COST rnd_pos_time(ha_rows rows) override;
IO_AND_CPU_COST keyread_time(uint index, ulong ranges, ha_rows rows,
ulonglong blocks) override;
int open(const char *name, int mode, uint test_if_locked) override;
handler *clone(const char *name, MEM_ROOT *mem_root) override;
int close(void) override;
int write_row(const uchar * buf) override;
int update_row(const uchar * old_data, const uchar * new_data) override;
int delete_row(const uchar * buf) override;
int index_read_map(uchar *buf, const uchar *key, key_part_map keypart_map,
enum ha_rkey_function find_flag) override;
int index_read_idx_map(uchar *buf, uint index, const uchar *key,
key_part_map keypart_map,
enum ha_rkey_function find_flag) override;
int index_read_last_map(uchar *buf, const uchar *key, key_part_map keypart_map) override;
int index_next(uchar * buf) override;
int index_prev(uchar * buf) override;
int index_first(uchar * buf) override;
int index_last(uchar * buf) override;
int index_next_same(uchar *buf, const uchar *key, uint keylen) override;
int rnd_init(bool scan) override;
int rnd_next(uchar *buf) override;
int rnd_pos(uchar * buf, uchar *pos) override;
void position(const uchar *record) override;
ha_rows records_in_range(uint inx, const key_range *start_key,
const key_range *end_key, page_range *pages) override;
int delete_all_rows() override;
int info(uint) override;
int reset(void) override;
int extra(enum ha_extra_function operation) override;
int extra_opt(enum ha_extra_function operation, ulong cache_size) override;
int external_lock(THD *thd, int lock_type) override;
uint lock_count(void) const override;
int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info) override;
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type) override;
void update_create_info(HA_CREATE_INFO *create_info) override;
void append_create_info(String *packet) override;
enum_alter_inplace_result check_if_supported_inplace_alter(TABLE *,
Alter_inplace_info *) override;
bool inplace_alter_table(TABLE *altered_table,
Alter_inplace_info *ha_alter_info) override;
int check(THD* thd, HA_CHECK_OPT* check_opt) override;
ha_rows records() override;
virtual uint count_query_cache_dependant_tables(uint8 *tables_type) override;
virtual my_bool
register_query_cache_dependant_tables(THD *thd,
Query_cache *cache,
Query_cache_block_table **block,
uint *n) override;
virtual void set_lock_type(enum thr_lock_type lock) override;
/* Internal interface functions, not part of the normal handler interface */
int add_children_list(void);
int attach_children(void);
int detach_children(void);
int create_mrg(const char *name, HA_CREATE_INFO *create_info);
MYRG_INFO *myrg_info() { return file; }
TABLE *table_ptr() { return table; }
};
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