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/* Copyright (C) 2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
/* Flags for partition handlers */
#define HA_CAN_PARTITION (1 << 0) /* Partition support */
#define HA_CAN_UPDATE_PARTITION_KEY (1 << 1)
#define HA_CAN_PARTITION_UNIQUE (1 << 2)
#define HA_USE_AUTO_PARTITION (1 << 3)
/*typedef struct {
ulonglong data_file_length;
ulonglong max_data_file_length;
ulonglong index_file_length;
ulonglong delete_length;
ha_rows records;
ulong mean_rec_length;
time_t create_time;
time_t check_time;
time_t update_time;
ulonglong check_sum;
} PARTITION_INFO;
*/
typedef struct {
longlong list_value;
uint32 partition_id;
} LIST_PART_ENTRY;
typedef struct {
uint32 start_part;
uint32 end_part;
} part_id_range;
struct st_partition_iter;
#define NOT_A_PARTITION_ID ((uint32)-1)
bool is_partition_in_list(char *part_name, List<char> list_part_names);
char *are_partitions_in_table(partition_info *new_part_info,
partition_info *old_part_info);
bool check_reorganise_list(partition_info *new_part_info,
partition_info *old_part_info,
List<char> list_part_names);
handler *get_ha_partition(partition_info *part_info);
int get_parts_for_update(const uchar *old_data, uchar *new_data,
const uchar *rec0, partition_info *part_info,
uint32 *old_part_id, uint32 *new_part_id,
longlong *func_value);
int get_part_for_delete(const uchar *buf, const uchar *rec0,
partition_info *part_info, uint32 *part_id);
void prune_partition_set(const TABLE *table, part_id_range *part_spec);
bool check_partition_info(partition_info *part_info,handlerton **eng_type,
TABLE *table, handler *file, HA_CREATE_INFO *info);
void set_linear_hash_mask(partition_info *part_info, uint no_parts);
bool fix_partition_func(THD *thd, TABLE *table, bool create_table_ind);
char *generate_partition_syntax(partition_info *part_info,
uint *buf_length, bool use_sql_alloc,
bool show_partition_options);
bool partition_key_modified(TABLE *table, const MY_BITMAP *fields);
void get_partition_set(const TABLE *table, uchar *buf, const uint index,
const key_range *key_spec,
part_id_range *part_spec);
void get_full_part_id_from_key(const TABLE *table, uchar *buf,
KEY *key_info,
const key_range *key_spec,
part_id_range *part_spec);
bool mysql_unpack_partition(THD *thd, const char *part_buf,
uint part_info_len,
const char *part_state, uint part_state_len,
TABLE *table, bool is_create_table_ind,
handlerton *default_db_type,
bool *work_part_info_used);
void make_used_partitions_str(partition_info *part_info, String *parts_str);
uint32 get_list_array_idx_for_endpoint(partition_info *part_info,
bool left_endpoint,
bool include_endpoint);
uint32 get_partition_id_range_for_endpoint(partition_info *part_info,
bool left_endpoint,
bool include_endpoint);
bool check_part_func_fields(Field **ptr, bool ok_with_charsets);
bool field_is_partition_charset(Field *field);
/*
A "Get next" function for partition iterator.
SYNOPSIS
partition_iter_func()
part_iter Partition iterator, you call only "iter.get_next(&iter)"
DESCRIPTION
Depending on whether partitions or sub-partitions are iterated, the
function returns next subpartition id/partition number. The sequence of
returned numbers is not ordered and may contain duplicates.
When the end of sequence is reached, NOT_A_PARTITION_ID is returned, and
the iterator resets itself (so next get_next() call will start to
enumerate the set all over again).
RETURN
NOT_A_PARTITION_ID if there are no more partitions.
[sub]partition_id of the next partition
*/
typedef uint32 (*partition_iter_func)(st_partition_iter* part_iter);
/*
Partition set iterator. Used to enumerate a set of [sub]partitions
obtained in partition interval analysis (see get_partitions_in_range_iter).
For the user, the only meaningful field is get_next, which may be used as
follows:
part_iterator.get_next(&part_iterator);
Initialization is done by any of the following calls:
- get_partitions_in_range_iter-type function call
- init_single_partition_iterator()
- init_all_partitions_iterator()
Cleanup is not needed.
*/
typedef struct st_partition_iter
{
partition_iter_func get_next;
/*
Valid for "Interval mapping" in LIST partitioning: if true, let the
iterator also produce id of the partition that contains NULL value.
*/
bool ret_null_part, ret_null_part_orig;
struct st_part_num_range
{
uint32 start;
uint32 cur;
uint32 end;
};
struct st_field_value_range
{
longlong start;
longlong cur;
longlong end;
};
union
{
struct st_part_num_range part_nums;
struct st_field_value_range field_vals;
};
partition_info *part_info;
} PARTITION_ITERATOR;
/*
Get an iterator for set of partitions that match given field-space interval
SYNOPSIS
get_partitions_in_range_iter()
part_info Partitioning info
is_subpart
min_val Left edge, field value in opt_range_key format.
max_val Right edge, field value in opt_range_key format.
flags Some combination of NEAR_MIN, NEAR_MAX, NO_MIN_RANGE,
NO_MAX_RANGE.
part_iter Iterator structure to be initialized
DESCRIPTION
Functions with this signature are used to perform "Partitioning Interval
Analysis". This analysis is applicable for any type of [sub]partitioning
by some function of a single fieldX. The idea is as follows:
Given an interval "const1 <=? fieldX <=? const2", find a set of partitions
that may contain records with value of fieldX within the given interval.
The min_val, max_val and flags parameters specify the interval.
The set of partitions is returned by initializing an iterator in *part_iter
NOTES
There are currently two functions of this type:
- get_part_iter_for_interval_via_walking
- get_part_iter_for_interval_via_mapping
RETURN
0 - No matching partitions, iterator not initialized
1 - Some partitions would match, iterator intialized for traversing them
-1 - All partitions would match, iterator not initialized
*/
typedef int (*get_partitions_in_range_iter)(partition_info *part_info,
bool is_subpart,
uchar *min_val, uchar *max_val,
uint flags,
PARTITION_ITERATOR *part_iter);
#include "partition_info.h"
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