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✏️ Editing: sql_partition.h

#ifndef SQL_PARTITION_INCLUDED
#define SQL_PARTITION_INCLUDED

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

#include "sql_list.h"                           /* List */
#include "table.h"                              /* TABLE_LIST */

class Alter_info;
class Alter_table_ctx;
class Field;
class String;
class handler;
class partition_info;
struct TABLE;
struct TABLE_LIST;
typedef struct st_bitmap MY_BITMAP;
typedef struct st_key KEY;
typedef struct st_key_range key_range;

/* 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)
#define HA_ONLY_VERS_PARTITION (1 << 4)

#define NORMAL_PART_NAME 0
#define TEMP_PART_NAME 1
#define RENAMED_PART_NAME 2

typedef struct st_lock_param_type
{
  TABLE_LIST *table_list;
  ulonglong copied;
  ulonglong deleted;
  THD *thd;
  HA_CREATE_INFO *create_info;
  Alter_info *alter_info;
  Alter_table_ctx *alter_ctx;
  TABLE *table;
  KEY *key_info_buffer;
  LEX_CUSTRING org_tabledef_version;
  uchar *pack_frm_data;
  uint key_count;
  uint db_options;
  size_t pack_frm_len;
  // TODO: remove duplicate data: part_info can be accessed via table->part_info
  partition_info *part_info;
} ALTER_PARTITION_PARAM_TYPE;

typedef struct {
  longlong list_value;
  uint32 partition_id;
} LIST_PART_ENTRY;

typedef struct {
  uint32 start_part;
  uint32 end_part;
} part_id_range;

class String_list;
struct st_partition_iter;
#define NOT_A_PARTITION_ID UINT_MAX32

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_part_for_buf(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 num_parts);
bool fix_partition_func(THD *thd, TABLE *table, bool create_table_ind);
void get_partition_set(const TABLE *table, uchar *buf, const uint index,
                       const key_range *key_spec,
                       part_id_range *part_spec);
uint get_partition_field_store_length(Field *field);
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, char *part_buf,
                            uint part_info_len,
                            TABLE *table, bool is_create_table_ind,
                            handlerton *default_db_type,
                            bool *work_part_info_used);
void make_used_partitions_str(MEM_ROOT *mem_root,
                              partition_info *part_info, String *parts_str,
                              String_list &used_partitions_list);
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);
Item* convert_charset_partition_constant(Item *item, CHARSET_INFO *cs);
/**
  Append all fields in read_set to string

@param[in,out] str   String to append to.
  @param[in]     row   Row to append.
  @param[in]     table Table containing read_set and fields for the row.
*/
void append_row_to_str(String &str, const uchar *row, TABLE *table);
void truncate_partition_filename(char *path);

/*
  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;
  /*
    We should return DEFAULT partition.
  */
  bool ret_default_part, ret_default_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
      store_length_array   Length of fields packed in opt_range_key format
      min_val              Left edge,  field value in opt_range_key format
      max_val              Right edge, field value in opt_range_key format
      min_len              Length of minimum value
      max_len              Length of maximum value
      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 three functions of this type:
     - get_part_iter_for_interval_via_walking
     - get_part_iter_for_interval_cols_via_map
     - 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,
                                            uint32 *store_length_array,
                                            uchar *min_val, uchar *max_val,
                                            uint min_len, uint max_len,
                                            uint flags,
                                            PARTITION_ITERATOR *part_iter);

#include "partition_info.h"

#ifdef WITH_PARTITION_STORAGE_ENGINE
uint fast_alter_partition_table(THD *thd, TABLE *table,
                                Alter_info *alter_info,
                                Alter_table_ctx *alter_ctx,
                                HA_CREATE_INFO *create_info,
                                TABLE_LIST *table_list);
bool set_part_state(Alter_info *alter_info, partition_info *tab_part_info,
                    enum partition_state part_state);
uint prep_alter_part_table(THD *thd, TABLE *table, Alter_info *alter_info,
                           HA_CREATE_INFO *create_info,
                           bool *partition_changed,
                           bool *fast_alter_table);
char *generate_partition_syntax(THD *thd, partition_info *part_info,
                                uint *buf_length,
                                bool show_partition_options,
                                HA_CREATE_INFO *create_info,
                                Alter_info *alter_info);
char *generate_partition_syntax_for_frm(THD *thd, partition_info *part_info,
                                        uint *buf_length,
                                        HA_CREATE_INFO *create_info,
                                        Alter_info *alter_info);
bool verify_data_with_partition(TABLE *table, TABLE *part_table,
                                uint32 part_id);
bool compare_partition_options(HA_CREATE_INFO *table_create_info,
                               partition_element *part_elem);
bool compare_table_with_partition(THD *thd, TABLE *table,
                                  TABLE *part_table,
                                  partition_element *part_elem,
                                  uint part_id);
bool partition_key_modified(TABLE *table, const MY_BITMAP *fields);
bool write_log_replace_frm(ALTER_PARTITION_PARAM_TYPE *lpt,
                            uint next_entry,
                            const char *from_path,
                            const char *to_path);

#else
#define partition_key_modified(X,Y) 0
#endif

int __attribute__((warn_unused_result))
  create_partition_name(char *out, size_t outlen, const char *in1, const char
                        *in2, uint name_variant, bool translate);
int __attribute__((warn_unused_result))
  create_subpartition_name(char *out, size_t outlen, const char *in1, const
                           char *in2, const char *in3, uint name_variant);

void set_key_field_ptr(KEY *key_info, const uchar *new_buf,
                       const uchar *old_buf);

/** Set up table for creating a partition.
Copy info from partition to the table share so the created partition
has the correct info.
  @param thd               THD object
  @param share             Table share to be updated.
  @param info              Create info to be updated.
  @param part_elem         partition_element containing the info.

@return    status
    @retval  TRUE  Error
    @retval  FALSE Success

@details
    Set up
    1) Comment on partition
    2) MAX_ROWS, MIN_ROWS on partition
    3) Index file name on partition
    4) Data file name on partition
*/
bool set_up_table_before_create(THD *thd,
                                TABLE_SHARE *share,
                                const char *partition_name_with_path,
                                HA_CREATE_INFO *info,
                                partition_element *part_elem);

#endif /* SQL_PARTITION_INCLUDED */

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