MySQL 8.4.3
Source Code Documentation
ha_heap Class Reference

#include <ha_heap.h>

Inheritance diagram for ha_heap:
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Public Member Functions

 ha_heap (handlerton *hton, TABLE_SHARE *table)
 
 ~ha_heap () override=default
 
handlerclone (const char *name, MEM_ROOT *mem_root) override
 
const char * table_type () const override
 The following can be called without an open handler. More...
 
enum ha_key_alg get_default_index_algorithm () const override
 Get default key algorithm for SE. More...
 
bool is_index_algorithm_supported (enum ha_key_alg key_alg) const override
 Check if SE supports specific key algorithm. More...
 
enum row_type get_real_row_type (const HA_CREATE_INFO *) const override
 Get real row type for the table created based on one specified by user, CREATE TABLE options and SE capabilities. More...
 
ulonglong table_flags () const override
 
ulong index_flags (uint inx, uint, bool) const override
 
uint max_supported_keys () const override
 
uint max_supported_key_part_length (HA_CREATE_INFO *create_info) const override
 
double scan_time () override
 
double read_time (uint, uint, ha_rows rows) override
 The cost of reading a set of ranges from the table using an index to access it. More...
 
int open (const char *name, int mode, uint test_if_locked, const dd::Table *table_def) override
 
int close (void) override
 
void set_keys_for_scanning (void)
 
int write_row (uchar *buf) override
 Write a row. More...
 
int update_row (const uchar *old_data, uchar *new_data) override
 Update a single row. More...
 
int delete_row (const uchar *buf) override
 
void get_auto_increment (ulonglong offset, ulonglong increment, ulonglong nb_desired_values, ulonglong *first_value, ulonglong *nb_reserved_values) override
 Reserves an interval of auto_increment values from the handler. More...
 
int index_read_map (uchar *buf, const uchar *key, key_part_map keypart_map, enum ha_rkey_function find_flag) override
 Positions an index cursor to the index specified in the handle ('active_index'). More...
 
int index_read_last_map (uchar *buf, const uchar *key, key_part_map keypart_map) override
 The following functions works like index_read, but it find the last row with the current key value or prefix. More...
 
int index_read_idx_map (uchar *buf, uint index, const uchar *key, key_part_map keypart_map, enum ha_rkey_function find_flag) override
 Positions an index cursor to the index specified in argument. More...
 
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 rnd_init (bool scan) override
 rnd_init() can be called two times without rnd_end() in between (it only makes sense if scan=1). More...
 
int rnd_next (uchar *buf) override
 
int rnd_pos (uchar *buf, uchar *pos) override
 
void position (const uchar *record) override
 
int info (uint) override
 General method to gather info from handler. More...
 
int extra (enum ha_extra_function operation) override
 Storage engine specific implementation of ha_extra() More...
 
int reset () override
 Reset state of file to after 'open'. More...
 
int external_lock (THD *thd, int lock_type) override
 Is not invoked for non-transactional temporary tables. More...
 
int delete_all_rows (void) override
 Delete all rows in a table. More...
 
int disable_indexes (uint mode) override
 Disable indexes for a while. More...
 
int enable_indexes (uint mode) override
 Enable indexes again. More...
 
int indexes_are_disabled (void) override
 Check if indexes are disabled. More...
 
ha_rows records_in_range (uint inx, key_range *min_key, key_range *max_key) override
 Find number of records in a range. More...
 
int delete_table (const char *from, const dd::Table *table_def) override
 Delete a table. More...
 
void drop_table (const char *name) override
 
int rename_table (const char *from, const char *to, const dd::Table *from_table_def, dd::Table *to_table_def) override
 Default rename_table() and delete_table() rename/delete files with a given name and extensions from handlerton::file_extensions. More...
 
int create (const char *name, TABLE *form, HA_CREATE_INFO *create_info, dd::Table *table_def) override
 Create table (implementation). More...
 
void update_create_info (HA_CREATE_INFO *create_info) override
 Update create info as part of ALTER TABLE. More...
 
THR_LOCK_DATA ** store_lock (THD *thd, THR_LOCK_DATA **to, enum thr_lock_type lock_type) override
 Is not invoked for non-transactional temporary tables. More...
 
int cmp_ref (const uchar *ref1, const uchar *ref2) const override
 Compare two positions. More...
 
bool check_if_incompatible_data (HA_CREATE_INFO *info, uint table_changes) override
 Part of old, deprecated in-place ALTER API. More...
 
- Public Member Functions inherited from handler
void unbind_psi ()
 
void rebind_psi ()
 
void start_psi_batch_mode ()
 Put the handler in 'batch' mode when collecting table io instrumented events. More...
 
void end_psi_batch_mode ()
 End a batch started with start_psi_batch_mode. More...
 
bool end_psi_batch_mode_if_started ()
 If a PSI batch was started, turn if off. More...
 
 handler (handlerton *ht_arg, TABLE_SHARE *share_arg)
 
virtual ~handler (void)
 
virtual std::string explain_extra () const
 Return extra handler specific text for EXPLAIN. More...
 
void init ()
 This is called after create to allow us to set up cached variables. More...
 
void ha_set_record_buffer (Record_buffer *buffer)
 Set a record buffer that the storage engine can use for multi-row reads. More...
 
Record_bufferha_get_record_buffer () const
 Get the record buffer that was set with ha_set_record_buffer(). More...
 
bool ha_is_record_buffer_wanted (ha_rows *const max_rows) const
 Does this handler want to get a Record_buffer for multi-row reads via the ha_set_record_buffer() function? And if so, what is the maximum number of records to allocate space for in the buffer? More...
 
int ha_open (TABLE *table, const char *name, int mode, int test_if_locked, const dd::Table *table_def)
 
int ha_close (void)
 Close handler. More...
 
int ha_index_init (uint idx, bool sorted)
 Initialize use of index. More...
 
int ha_index_end ()
 End use of index. More...
 
int ha_rnd_init (bool scan)
 Initialize table for random read or scan. More...
 
int ha_rnd_end ()
 End use of random access. More...
 
int ha_rnd_next (uchar *buf)
 Read next row via random scan. More...
 
int ha_rnd_pos (uchar *buf, uchar *pos)
 Read row via random scan from position. More...
 
int ha_index_read_map (uchar *buf, const uchar *key, key_part_map keypart_map, enum ha_rkey_function find_flag)
 Read [part of] row via [part of] index. More...
 
int ha_index_read_last_map (uchar *buf, const uchar *key, key_part_map keypart_map)
 
int ha_index_read_idx_map (uchar *buf, uint index, const uchar *key, key_part_map keypart_map, enum ha_rkey_function find_flag)
 Initializes an index and read it. More...
 
int ha_index_next (uchar *buf)
 Reads the next row via index. More...
 
int ha_index_prev (uchar *buf)
 Reads the previous row via index. More...
 
int ha_index_first (uchar *buf)
 Reads the first row via index. More...
 
int ha_index_last (uchar *buf)
 Reads the last row via index. More...
 
int ha_index_next_same (uchar *buf, const uchar *key, uint keylen)
 Reads the next same row via index. More...
 
int ha_reset ()
 Check handler usage and reset state of file to after 'open'. More...
 
int ha_index_or_rnd_end ()
 
Table_flags ha_table_flags () const
 The cached_table_flags is set at ha_open and ha_external_lock. More...
 
int ha_external_lock (THD *thd, int lock_type)
 These functions represent the public interface to users of the handler class, hence they are not virtual. More...
 
int ha_write_row (uchar *buf)
 
int ha_update_row (const uchar *old_data, uchar *new_data)
 Update the current row. More...
 
int ha_delete_row (const uchar *buf)
 
void ha_release_auto_increment ()
 
int ha_check_for_upgrade (HA_CHECK_OPT *check_opt)
 
int ha_check (THD *thd, HA_CHECK_OPT *check_opt)
 to be actually called to get 'check()' functionality More...
 
int ha_repair (THD *thd, HA_CHECK_OPT *check_opt)
 Repair table: public interface. More...
 
void ha_start_bulk_insert (ha_rows rows)
 Start bulk insert. More...
 
int ha_end_bulk_insert ()
 End bulk insert. More...
 
int ha_bulk_update_row (const uchar *old_data, uchar *new_data, uint *dup_key_found)
 Bulk update row: public interface. More...
 
int ha_delete_all_rows ()
 Delete all rows: public interface. More...
 
int ha_truncate (dd::Table *table_def)
 Truncate table: public interface. More...
 
int ha_optimize (THD *thd, HA_CHECK_OPT *check_opt)
 Optimize table: public interface. More...
 
int ha_analyze (THD *thd, HA_CHECK_OPT *check_opt)
 Analyze table: public interface. More...
 
bool ha_check_and_repair (THD *thd)
 Check and repair table: public interface. More...
 
int ha_disable_indexes (uint mode)
 Disable indexes: public interface. More...
 
int ha_enable_indexes (uint mode)
 Enable indexes: public interface. More...
 
int ha_discard_or_import_tablespace (bool discard, dd::Table *table_def)
 Discard or import tablespace: public interface. More...
 
int ha_rename_table (const char *from, const char *to, const dd::Table *from_table_def, dd::Table *to_table_def)
 Rename table: public interface. More...
 
int ha_delete_table (const char *name, const dd::Table *table_def)
 Delete table: public interface. More...
 
void ha_drop_table (const char *name)
 Drop table in the engine: public interface. More...
 
int ha_create (const char *name, TABLE *form, HA_CREATE_INFO *info, dd::Table *table_def)
 Create a table in the engine: public interface. More...
 
int ha_load_table (const TABLE &table, bool *skip_metadata_update)
 Loads a table into its defined secondary storage engine: public interface. More...
 
int ha_unload_table (const char *db_name, const char *table_name, bool error_if_not_loaded)
 Unloads a table from its defined secondary storage engine: public interface. More...
 
virtual int parallel_scan_init (void *&scan_ctx, size_t *num_threads, bool use_reserved_threads, size_t max_desired_threads)
 Initializes a parallel scan. More...
 
virtual int parallel_scan (void *scan_ctx, void **thread_ctxs, Load_init_cbk init_fn, Load_cbk load_fn, Load_end_cbk end_fn)
 Run the parallel read of data. More...
 
virtual void parallel_scan_end (void *scan_ctx)
 End of the parallel scan. More...
 
virtual bool bulk_load_check (THD *thd) const
 Check if the table is ready for bulk load. More...
 
virtual size_t bulk_load_available_memory (THD *thd) const
 Get the total memory available for bulk load in SE. More...
 
virtual void * bulk_load_begin (THD *thd, size_t data_size, size_t memory, size_t num_threads)
 Begin parallel bulk data load to the table. More...
 
virtual int bulk_load_execute (THD *thd, void *load_ctx, size_t thread_idx, const Rows_mysql &rows, Bulk_load::Stat_callbacks &wait_cbk)
 Execute bulk load operation. More...
 
virtual int bulk_load_end (THD *thd, void *load_ctx, bool is_error)
 End bulk load operation. More...
 
bool ha_get_se_private_data (dd::Table *dd_table, bool reset)
 Submit a dd::Table object representing a core DD table having hardcoded data to be filled in by the DDSE. More...
 
void adjust_next_insert_id_after_explicit_value (ulonglong nr)
 
int update_auto_increment ()
 
virtual void print_error (int error, myf errflag)
 Print error that we got from handler function. More...
 
virtual bool get_error_message (int error, String *buf)
 Return an error message specific to this handler. More...
 
uint get_dup_key (int error)
 
virtual bool get_foreign_dup_key (char *child_table_name, uint child_table_name_len, char *child_key_name, uint child_key_name_len)
 Retrieves the names of the table and the key for which there was a duplicate entry in the case of HA_ERR_FOREIGN_DUPLICATE_KEY. More...
 
virtual void change_table_ptr (TABLE *table_arg, TABLE_SHARE *share)
 Change the internal TABLE_SHARE pointer. More...
 
const TABLE_SHAREget_table_share () const
 
const TABLEget_table () const
 
virtual double index_only_read_time (uint keynr, double records)
 Calculate cost of 'index only' scan for given index and number of records. More...
 
virtual Cost_estimate table_scan_cost ()
 Cost estimate for doing a complete table scan. More...
 
virtual Cost_estimate index_scan_cost (uint index, double ranges, double rows)
 Cost estimate for reading a number of ranges from an index. More...
 
virtual Cost_estimate read_cost (uint index, double ranges, double rows)
 Cost estimate for reading a set of ranges from the table using an index to access it. More...
 
virtual double page_read_cost (uint index, double reads)
 Cost estimate for doing a number of non-sequentially accesses against the storage engine. More...
 
virtual double worst_seek_times (double reads)
 Provide an upper cost-limit of doing a specified number of seek-and-read key lookups. More...
 
virtual longlong get_memory_buffer_size () const
 Return an estimate on the amount of memory the storage engine will use for caching data in memory. More...
 
double table_in_memory_estimate () const
 Return an estimate of how much of the table that is currently stored in main memory. More...
 
double index_in_memory_estimate (uint keyno) const
 Return an estimate of how much of the index that is currently stored in main memory. More...
 
int ha_sample_init (void *&scan_ctx, double sampling_percentage, int sampling_seed, enum_sampling_method sampling_method, const bool tablesample)
 Initialize sampling. More...
 
int ha_sample_next (void *scan_ctx, uchar *buf)
 Get the next record for sampling. More...
 
int ha_sample_end (void *scan_ctx)
 End sampling. More...
 
virtual ha_rows multi_range_read_info_const (uint keyno, RANGE_SEQ_IF *seq, void *seq_init_param, uint n_ranges, uint *bufsz, uint *flags, bool *force_default_mrr, Cost_estimate *cost)
 Get cost and other information about MRR scan over a known list of ranges. More...
 
virtual ha_rows multi_range_read_info (uint keyno, uint n_ranges, uint keys, uint *bufsz, uint *flags, Cost_estimate *cost)
 Get cost and other information about MRR scan over some sequence of ranges. More...
 
virtual int multi_range_read_init (RANGE_SEQ_IF *seq, void *seq_init_param, uint n_ranges, uint mode, HANDLER_BUFFER *buf)
 Initialize the MRR scan. More...
 
int ha_multi_range_read_next (char **range_info)
 
int ha_read_range_first (const key_range *start_key, const key_range *end_key, bool eq_range, bool sorted)
 
int ha_read_range_next ()
 
bool has_transactions ()
 
virtual uint extra_rec_buf_length () const
 
virtual bool is_ignorable_error (int error)
 Determine whether an error can be ignored or not. More...
 
virtual bool is_fatal_error (int error)
 Determine whether an error is fatal or not. More...
 
int ha_records (ha_rows *num_rows)
 Wrapper function to call records() in storage engine. More...
 
int ha_records (ha_rows *num_rows, uint index)
 Wrapper function to call records_from_index() in storage engine. More...
 
virtual ha_rows estimate_rows_upper_bound ()
 Return upper bound of current number of records in the table (max. More...
 
virtual void column_bitmaps_signal ()
 Signal that the table->read_set and table->write_set table maps changed The handler is allowed to set additional bits in the above map in this call. More...
 
uint get_index (void) const
 
virtual bool start_bulk_update ()
 
virtual bool start_bulk_delete ()
 
virtual int exec_bulk_update (uint *dup_key_found)
 After this call all outstanding updates must be performed. More...
 
virtual void end_bulk_update ()
 Perform any needed clean-up, no outstanding updates are there at the moment. More...
 
virtual int end_bulk_delete ()
 Execute all outstanding deletes and close down the bulk delete. More...
 
void set_end_range (const key_range *range, enum_range_scan_direction direction)
 Set the end position for a range scan. More...
 
int compare_key (key_range *range)
 Compare if found key (in row) is over max-value. More...
 
int compare_key_icp (const key_range *range) const
 
int compare_key_in_buffer (const uchar *buf) const
 Check if the key in the given buffer (which is not necessarily TABLE::record[0]) is within range. More...
 
virtual int ft_init ()
 
virtual FT_INFOft_init_ext (uint flags, uint inx, String *key)
 
virtual FT_INFOft_init_ext_with_hints (uint inx, String *key, Ft_hints *hints)
 
int ha_ft_read (uchar *buf)
 
int ha_read_first_row (uchar *buf, uint primary_key)
 Read first row (only) from a table. More...
 
virtual int rnd_pos_by_record (uchar *record)
 This function only works for handlers having HA_PRIMARY_KEY_REQUIRED_FOR_POSITION set. More...
 
virtual uint32 calculate_key_hash_value (Field **field_array)
 
int ha_extra (enum ha_extra_function operation)
 Request storage engine to do an extra operation: enable,disable or run some functionality. More...
 
virtual int extra_opt (enum ha_extra_function operation, ulong cache_size)
 
virtual const handlertonhton_supporting_engine_pushdown ()
 Get the handlerton of the storage engine if the SE is capable of pushing down some of the AccessPath functionality. More...
 
virtual bool start_read_removal (void)
 Start read (before write) removal on the current table. More...
 
virtual ha_rows end_read_removal (void)
 End read (before write) removal and return the number of rows really written. More...
 
virtual bool was_semi_consistent_read ()
 
virtual void try_semi_consistent_read (bool)
 Tell the engine whether it should avoid unnecessary lock waits. More...
 
virtual void unlock_row ()
 Unlock last accessed row. More...
 
virtual int start_stmt (THD *thd, thr_lock_type lock_type)
 Start a statement when table is locked. More...
 
void set_next_insert_id (ulonglong id)
 
void restore_auto_increment (ulonglong prev_insert_id)
 
virtual int assign_to_keycache (THD *, HA_CHECK_OPT *)
 
virtual int preload_keys (THD *, HA_CHECK_OPT *)
 
virtual void append_create_info (String *packet)
 
virtual void init_table_handle_for_HANDLER ()
 
uint max_record_length () const
 
uint max_keys () const
 
uint max_key_parts () const
 
uint max_key_length () const
 
uint max_key_part_length (HA_CREATE_INFO *create_info) const
 
virtual uint max_supported_record_length () const
 
virtual uint max_supported_key_parts () const
 
virtual uint max_supported_key_length () const
 
virtual uint min_record_length (uint options) const
 
virtual bool low_byte_first () const
 
virtual ha_checksum checksum () const
 
virtual bool is_crashed () const
 Check if the table is crashed. More...
 
virtual bool auto_repair () const
 Check if the table can be automatically repaired. More...
 
virtual uint lock_count (void) const
 Get number of lock objects returned in store_lock. More...
 
virtual bool primary_key_is_clustered () const
 Check if the primary key is clustered or not. More...
 
virtual const Itemcond_push (const Item *cond)
 Push condition down to the table handler. More...
 
virtual Itemidx_cond_push (uint keyno, Item *idx_cond)
 Push down an index condition to the handler. More...
 
virtual void cancel_pushed_idx_cond ()
 Reset information about pushed index conditions. More...
 
virtual uint number_of_pushed_joins () const
 Reports number of tables included in pushed join which this handler instance is part of. More...
 
virtual const TABLEmember_of_pushed_join () const
 If this handler instance is part of a pushed join sequence returned TABLE instance being root of the pushed query? More...
 
virtual const TABLEparent_of_pushed_join () const
 If this handler instance is a child in a pushed join sequence returned TABLE instance being my parent? More...
 
virtual table_map tables_in_pushed_join () const
 
int ha_index_read_pushed (uchar *buf, const uchar *key, key_part_map keypart_map)
 
int ha_index_next_pushed (uchar *buf)
 
virtual enum_alter_inplace_result check_if_supported_inplace_alter (TABLE *altered_table, Alter_inplace_info *ha_alter_info)
 Check if a storage engine supports a particular alter table in-place. More...
 
bool ha_prepare_inplace_alter_table (TABLE *altered_table, Alter_inplace_info *ha_alter_info, const dd::Table *old_table_def, dd::Table *new_table_def)
 Public functions wrapping the actual handler call. More...
 
bool ha_inplace_alter_table (TABLE *altered_table, Alter_inplace_info *ha_alter_info, const dd::Table *old_table_def, dd::Table *new_table_def)
 Public function wrapping the actual handler call. More...
 
bool ha_commit_inplace_alter_table (TABLE *altered_table, Alter_inplace_info *ha_alter_info, bool commit, const dd::Table *old_table_def, dd::Table *new_table_def)
 Public function wrapping the actual handler call. More...
 
void ha_notify_table_changed (Alter_inplace_info *ha_alter_info)
 Public function wrapping the actual handler call. More...
 
virtual void use_hidden_primary_key ()
 use_hidden_primary_key() is called in case of an update/delete when (table_flags() and HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) is defined but we don't have a primary key More...
 
virtual int bulk_update_row (const uchar *old_data, uchar *new_data, uint *dup_key_found)
 This method is similar to update_row, however the handler doesn't need to execute the updates at this point in time. More...
 
virtual int truncate (dd::Table *table_def)
 Quickly remove all rows from a table. More...
 
virtual int optimize (THD *, HA_CHECK_OPT *)
 
virtual int analyze (THD *, HA_CHECK_OPT *)
 
virtual bool check_and_repair (THD *thd)
 Check and repair the table if necessary. More...
 
virtual int discard_or_import_tablespace (bool discard, dd::Table *table_def)
 Discard or import tablespace. More...
 
virtual bool get_se_private_data (dd::Table *dd_table, bool reset)
 
virtual int get_extra_columns_and_keys (const HA_CREATE_INFO *create_info, const List< Create_field > *create_list, const KEY *key_info, uint key_count, dd::Table *table_obj)
 Adjust definition of table to be created by adding implicit columns and indexes necessary for the storage engine. More...
 
virtual bool set_ha_share_ref (Handler_share **arg_ha_share)
 
void set_ha_table (TABLE *table_arg)
 
int get_lock_type () const
 
virtual Partition_handlerget_partition_handler ()
 
bool ha_upgrade_table (THD *thd, const char *dbname, const char *table_name, dd::Table *dd_table, TABLE *table_arg)
 Set se_private_id and se_private_data during upgrade. More...
 
void ha_set_primary_handler (handler *primary_handler)
 Store a pointer to the handler of the primary table that corresponds to the secondary table in this handler. More...
 
handlerha_get_primary_handler () const
 Get a pointer to a handler for the table in the primary storage engine, if this handler is for a table in a secondary storage engine. More...
 
void ha_mv_key_capacity (uint *num_keys, size_t *keys_length) const
 Return max limits for a single set of multi-valued keys. More...
 
virtual void set_external_table_offload_error (const char *)
 Propagates the secondary storage engine offload failure reason for a query to the external engine when the offloaded query fails in the secondary storage engine. More...
 
virtual void external_table_offload_error () const
 Identifies and throws the propagated external engine query offload or exec failure reason given by the external engine handler. More...
 

Private Member Functions

void update_key_stats ()
 Update index statistics for the table. More...
 

Private Attributes

HP_INFOfile {nullptr}
 
HP_SHAREinternal_share {nullptr}
 
uint records_changed {0}
 
uint key_stat_version {0}
 
bool single_instance {false}
 True if only one ha_heap is to exist for the table. More...
 

Additional Inherited Members

- Public Types inherited from handler
enum  enum_range_scan_direction { RANGE_SCAN_ASC , RANGE_SCAN_DESC }
 
enum  { NONE = 0 , INDEX , RND , SAMPLING }
 
typedef ulonglong Table_flags
 
using Load_init_cbk = std::function< bool(void *cookie, ulong ncols, ulong row_len, const ulong *col_offsets, const ulong *null_byte_offsets, const ulong *null_bitmasks)>
 This callback is called by each parallel load thread at the beginning of the parallel load for the adapter scan. More...
 
using Load_cbk = std::function< bool(void *cookie, uint nrows, void *rowdata, uint64_t partition_id)>
 This callback is called by each parallel load thread when processing of rows is required for the adapter scan. More...
 
using Load_end_cbk = std::function< void(void *cookie)>
 This callback is called by each parallel load thread when processing of rows has ended for the adapter scan. More...
 
typedef void(* my_gcolumn_template_callback_t) (const TABLE *, void *)
 Callback function that will be called by my_prepare_gcolumn_template once the table has been opened. More...
 
- Static Public Member Functions inherited from handler
static bool my_prepare_gcolumn_template (THD *thd, const char *db_name, const char *table_name, my_gcolumn_template_callback_t myc, void *ib_table)
 Callback to allow InnoDB to prepare a template for generated column processing. More...
 
static bool my_eval_gcolumn_expr_with_open (THD *thd, const char *db_name, const char *table_name, const MY_BITMAP *const fields, uchar *record, const char **mv_data_ptr, ulong *mv_length)
 Callback for generated columns processing. More...
 
static bool my_eval_gcolumn_expr (THD *thd, TABLE *table, const MY_BITMAP *const fields, uchar *record, const char **mv_data_ptr, ulong *mv_length)
 Callback for computing generated column values. More...
 
- Public Attributes inherited from handler
handlertonht
 
ucharref
 Pointer to current row. More...
 
uchardup_ref
 Pointer to duplicate row. More...
 
ha_statistics stats
 
range_seq_t mrr_iter
 
RANGE_SEQ_IF mrr_funcs
 
HANDLER_BUFFERmulti_range_buffer
 
uint ranges_in_seq
 
bool mrr_is_output_sorted
 
bool mrr_have_range
 
KEY_MULTI_RANGE mrr_cur_range
 
key_rangeend_range
 End value for a range scan. More...
 
bool m_virt_gcol_in_end_range = false
 Flag which tells if end_range contains a virtual generated column. More...
 
uint errkey
 
uint key_used_on_scan
 
uint active_index
 
uint ref_length
 Length of ref (1-8 or the clustered key length) More...
 
FT_INFOft_handler
 
enum handler:: { ... }  inited
 
bool implicit_emptied
 
const Itempushed_cond
 
Itempushed_idx_cond
 
uint pushed_idx_cond_keyno
 
ulonglong next_insert_id
 next_insert_id is the next value which should be inserted into the auto_increment column: in a inserting-multi-row statement (like INSERT SELECT), for the first row where the autoinc value is not specified by the statement, get_auto_increment() called and asked to generate a value, next_insert_id is set to the next value, then for all other rows next_insert_id is used (and increased each time) without calling get_auto_increment(). More...
 
ulonglong insert_id_for_cur_row
 insert id for the current row (autogenerated; if not autogenerated, it's 0). More...
 
Discrete_interval auto_inc_interval_for_cur_row
 Interval returned by get_auto_increment() and being consumed by the inserter. More...
 
uint auto_inc_intervals_count
 Number of reserved auto-increment intervals. More...
 
PSI_tablem_psi
 Instrumented table associated with this handler. More...
 
std::mt19937 * m_random_number_engine {nullptr}
 
double m_sampling_percentage
 
- Protected Member Functions inherited from handler
virtual int multi_range_read_next (char **range_info)
 Get next record in MRR scan. More...
 
virtual int records (ha_rows *num_rows)
 Number of rows in table. More...
 
virtual int records_from_index (ha_rows *num_rows, uint index)
 Number of rows in table counted using the secondary index chosen by optimizer. More...
 
virtual int index_next_same (uchar *buf, const uchar *key, uint keylen)
 
virtual int read_range_first (const key_range *start_key, const key_range *end_key, bool eq_range_arg, bool sorted)
 Read first row between two ranges. More...
 
virtual int read_range_next ()
 Read next row between two endpoints. More...
 
virtual int ft_read (uchar *)
 
virtual int index_read_pushed (uchar *, const uchar *, key_part_map)
 
virtual int index_next_pushed (uchar *)
 
virtual bool prepare_inplace_alter_table (TABLE *altered_table, Alter_inplace_info *ha_alter_info, const dd::Table *old_table_def, dd::Table *new_table_def)
 Allows the storage engine to update internal structures with concurrent writes blocked. More...
 
virtual bool inplace_alter_table (TABLE *altered_table, Alter_inplace_info *ha_alter_info, const dd::Table *old_table_def, dd::Table *new_table_def)
 Alter the table structure in-place with operations specified using HA_ALTER_FLAGS and Alter_inplace_info. More...
 
virtual bool commit_inplace_alter_table (TABLE *altered_table, Alter_inplace_info *ha_alter_info, bool commit, const dd::Table *old_table_def, dd::Table *new_table_def)
 Commit or rollback the changes made during prepare_inplace_alter_table() and inplace_alter_table() inside the storage engine. More...
 
virtual void notify_table_changed (Alter_inplace_info *ha_alter_info)
 Notify the storage engine that the table definition has been updated. More...
 
void ha_statistic_increment (ulonglong System_status_var::*offset) const
 
THDha_thd () const
 
PSI_table_shareha_table_share_psi (const TABLE_SHARE *share) const
 Acquire the instrumented table information from a table share. More...
 
virtual int index_read (uchar *buf, const uchar *key, uint key_len, enum ha_rkey_function find_flag)
 
virtual int index_read_last (uchar *buf, const uchar *key, uint key_len)
 
Handler_shareget_ha_share_ptr ()
 Get an initialized ha_share. More...
 
void set_ha_share_ptr (Handler_share *arg_ha_share)
 Set ha_share to be used by all instances of the same table/partition. More...
 
void lock_shared_ha_data ()
 Take a lock for protecting shared handler data. More...
 
void unlock_shared_ha_data ()
 Release lock for protecting ha_share. More...
 
- Protected Attributes inherited from handler
TABLE_SHAREtable_share
 
TABLEtable
 
Table_flags cached_table_flags {0}
 
ha_rows estimation_rows_to_insert
 
KEY_PART_INFOrange_key_part
 
bool eq_range
 
bool in_range_check_pushed_down
 

Constructor & Destructor Documentation

◆ ha_heap()

ha_heap::ha_heap ( handlerton hton,
TABLE_SHARE table 
)

◆ ~ha_heap()

ha_heap::~ha_heap ( )
overridedefault

Member Function Documentation

◆ check_if_incompatible_data()

bool ha_heap::check_if_incompatible_data ( HA_CREATE_INFO create_info,
uint  table_changes 
)
overridevirtual

Part of old, deprecated in-place ALTER API.

Reimplemented from handler.

◆ clone()

handler * ha_heap::clone ( const char *  name,
MEM_ROOT mem_root 
)
overridevirtual

Reimplemented from handler.

◆ close()

int ha_heap::close ( void  )
overridevirtual

Implements handler.

◆ cmp_ref()

int ha_heap::cmp_ref ( const uchar ref1,
const uchar ref2 
) const
inlineoverridevirtual

Compare two positions.

Parameters
ref1First position.
ref2Second position.
Return values
<0ref1 < ref2.
0Equal.
>0ref1 > ref2.

Reimplemented from handler.

◆ create()

int ha_heap::create ( const char *  name,
TABLE form,
HA_CREATE_INFO info,
dd::Table table_def 
)
overridevirtual

Create table (implementation).

Parameters
[in]nameTable name.
[in]formTABLE object describing the table to be created.
[in]infoHA_CREATE_INFO describing table.
[in,out]table_defdd::Table object describing the table to be created. This object can be adjusted by storage engine if it supports atomic DDL (i.e. has HTON_SUPPORTS_ATOMIC_DDL flag set). These changes will be persisted in the data-dictionary. Can be NULL for temporary tables created by optimizer.
Return values
0Success.
non-0Error.

Implements handler.

◆ delete_all_rows()

int ha_heap::delete_all_rows ( void  )
overridevirtual

Delete all rows in a table.

This is called both for cases of truncate and for cases where the optimizer realizes that all rows will be removed as a result of an SQL statement.

If the handler don't support this, then this function will return HA_ERR_WRONG_COMMAND and MySQL will delete the rows one by one.

Reimplemented from handler.

◆ delete_row()

int ha_heap::delete_row ( const uchar buf)
overridevirtual

Reimplemented from handler.

◆ delete_table()

int ha_heap::delete_table ( const char *  name,
const dd::Table table_def 
)
overridevirtual

Delete a table.

Used to delete a table. By the time delete_table() has been called all opened references to this table will have been closed (and your globally shared references released. The variable name will just be the name of the table. You will need to remove any files you have created at this point. Called for base as well as temporary tables.

Parameters
nameFull path of table name.
table_defdd::Table describing table being deleted (can be NULL for temporary tables created by optimizer).
Returns
Zero on success, nonzero otherwise.

Reimplemented from handler.

◆ disable_indexes()

int ha_heap::disable_indexes ( uint  mode)
overridevirtual

Disable indexes for a while.

Parameters
modeMode.
Return values
0Success.
!=0 Error.

Reimplemented from handler.

◆ drop_table()

void ha_heap::drop_table ( const char *  name)
overridevirtual

Reimplemented from handler.

◆ enable_indexes()

int ha_heap::enable_indexes ( uint  mode)
overridevirtual

Enable indexes again.

Parameters
modeMode.
Return values
0Success.
!=0 Error.

Reimplemented from handler.

◆ external_lock()

int ha_heap::external_lock ( THD thd,
int  lock_type 
)
overridevirtual

Is not invoked for non-transactional temporary tables.

Tells the storage engine that we intend to read or write data from the table. This call is prefixed with a call to handler::store_lock() and is invoked only for those handler instances that stored the lock.

Calls to rnd_init / index_init are prefixed with this call. When table IO is complete, we call

external_lock(F_UNLCK)
int external_lock(THD *thd, int lock_type) override
Is not invoked for non-transactional temporary tables.
Definition: ha_heap.cc:375

. A storage engine writer should expect that each call to

#define LOCK
Definition: dynamic_loader.cc:628

is followed by a call to

::external_lock(F_UNLCK)

. If it is not, it is a bug in MySQL.

The name and signature originate from the first implementation in MyISAM, which would call fcntl to set/clear an advisory lock on the data file in this method.

Originally this method was used to set locks on file level to enable several MySQL Servers to work on the same data. For transactional engines it has been "abused" to also mean start and end of statements to enable proper rollback of statements and transactions. When LOCK TABLES has been issued the start_stmt method takes over the role of indicating start of statement but in this case there is no end of statement indicator(?).

Called from lock.cc by lock_external() and unlock_external(). Also called from sql_table.cc by copy_data_between_tables().

Parameters
thdthe current thread
lock_typeF_RDLCK, F_WRLCK, F_UNLCK
Returns
non-0 in case of failure, 0 in case of success. When lock_type is F_UNLCK, the return value is ignored.

Reimplemented from handler.

◆ extra()

int ha_heap::extra ( enum ha_extra_function  operation)
overridevirtual

Storage engine specific implementation of ha_extra()

Parameters
operationthe operation to perform
Returns
0 on success error otherwise

Reimplemented from handler.

◆ get_auto_increment()

void ha_heap::get_auto_increment ( ulonglong  offset,
ulonglong  increment,
ulonglong  nb_desired_values,
ulonglong first_value,
ulonglong nb_reserved_values 
)
overridevirtual

Reserves an interval of auto_increment values from the handler.

Parameters
offsetoffset (modulus increment)
incrementincrement between calls
nb_desired_valueshow many values we want
[out]first_valuethe first value reserved by the handler
[out]nb_reserved_valueshow many values the handler reserved

offset and increment means that we want values to be of the form offset + N * increment, where N>=0 is integer. If the function sets *first_value to ULLONG_MAX it means an error. If the function sets *nb_reserved_values to ULLONG_MAX it means it has reserved to "positive infinite".

Reimplemented from handler.

◆ get_default_index_algorithm()

enum ha_key_alg ha_heap::get_default_index_algorithm ( ) const
inlineoverridevirtual

Get default key algorithm for SE.

It is used when user has not provided algorithm explicitly or when algorithm specified is not supported by SE.

Reimplemented from handler.

◆ get_real_row_type()

enum row_type ha_heap::get_real_row_type ( const HA_CREATE_INFO create_info) const
inlineoverridevirtual

Get real row type for the table created based on one specified by user, CREATE TABLE options and SE capabilities.

Reimplemented from handler.

◆ index_first()

int ha_heap::index_first ( uchar )
overridevirtual
See also
index_read_map().

Reimplemented from handler.

◆ index_flags()

ulong ha_heap::index_flags ( uint  inx,
uint  ,
bool   
) const
inlineoverridevirtual

Implements handler.

◆ index_last()

int ha_heap::index_last ( uchar )
overridevirtual
See also
index_read_map().

Reimplemented from handler.

◆ index_next()

int ha_heap::index_next ( uchar )
overridevirtual
See also
index_read_map().

Reimplemented from handler.

◆ index_prev()

int ha_heap::index_prev ( uchar )
overridevirtual
See also
index_read_map().

Reimplemented from handler.

◆ index_read_idx_map()

int ha_heap::index_read_idx_map ( uchar buf,
uint  index,
const uchar key,
key_part_map  keypart_map,
enum ha_rkey_function  find_flag 
)
overridevirtual

Positions an index cursor to the index specified in argument.

Fetches the row if available. If the key value is null, begin at the first key of the index.

See also
index_read_map()

Reimplemented from handler.

◆ index_read_last_map()

int ha_heap::index_read_last_map ( uchar buf,
const uchar key,
key_part_map  keypart_map 
)
overridevirtual

The following functions works like index_read, but it find the last row with the current key value or prefix.

See also
index_read_map().

Reimplemented from handler.

◆ index_read_map()

int ha_heap::index_read_map ( uchar buf,
const uchar key,
key_part_map  keypart_map,
enum ha_rkey_function  find_flag 
)
overridevirtual

Positions an index cursor to the index specified in the handle ('active_index').

Fetches the row if available. If the key value is null, begin at the first key of the index.

Returns
0 if success (found a record); non-zero if no record.

Reimplemented from handler.

◆ indexes_are_disabled()

int ha_heap::indexes_are_disabled ( void  )
overridevirtual

Check if indexes are disabled.

Return values
0Indexes are enabled.
!=0 Indexes are disabled.

Reimplemented from handler.

◆ info()

int ha_heap::info ( uint  flag)
overridevirtual

General method to gather info from handler.

info() is used to return information to the optimizer. SHOW also makes use of this data Another note, if your handler doesn't proved exact record count, you will probably want to have the following in your code: if (records < 2) records = 2; The reason is that the server will optimize for cases of only a single record. If in a table scan you don't know the number of records it will probably be better to set records to two so you can return as many records as you need.

Along with records a few more variables you may wish to set are: records deleted data_file_length index_file_length delete_length check_time Take a look at the public variables in handler.h for more information. See also my_base.h for a full description.

Parameters
flagSpecifies what info is requested

Implements handler.

◆ is_index_algorithm_supported()

bool ha_heap::is_index_algorithm_supported ( enum ha_key_alg  key_alg) const
inlineoverridevirtual

Check if SE supports specific key algorithm.

Note
This method is never used for FULLTEXT or SPATIAL keys. We rely on handler::ha_table_flags() to check if such keys are supported.

Reimplemented from handler.

◆ max_supported_key_part_length()

uint ha_heap::max_supported_key_part_length ( HA_CREATE_INFO create_info) const
inlineoverridevirtual

Reimplemented from handler.

◆ max_supported_keys()

uint ha_heap::max_supported_keys ( ) const
inlineoverridevirtual

Reimplemented from handler.

◆ open()

int ha_heap::open ( const char *  name,
int  mode,
uint  test_if_locked,
const dd::Table table_def 
)
overridevirtual

Implements handler.

◆ position()

void ha_heap::position ( const uchar record)
overridevirtual

Implements handler.

◆ read_time()

double ha_heap::read_time ( uint  index,
uint  ranges,
ha_rows  rows 
)
inlineoverridevirtual

The cost of reading a set of ranges from the table using an index to access it.

Deprecated:
This function is deprecated and will be removed in a future version. Use read_cost() instead.
Parameters
indexThe index number.
rangesThe number of ranges to be read.
rowsTotal number of rows to be read.

This method can be used to calculate the total cost of scanning a table using an index by calling it using read_time(index, 1, table_size).

Reimplemented from handler.

◆ records_in_range()

ha_rows ha_heap::records_in_range ( uint  inx,
key_range min_key,
key_range max_key 
)
overridevirtual

Find number of records in a range.

Given a starting key, and an ending key estimate the number of rows that will exist between the two. max_key may be empty which in case determine if start_key matches any rows. Used by optimizer to calculate cost of using a particular index.

Parameters
inxIndex number
min_keyStart of range
max_keyEnd of range
Returns
Number of rows in range.

Reimplemented from handler.

◆ rename_table()

int ha_heap::rename_table ( const char *  from,
const char *  to,
const dd::Table from_table_def,
dd::Table to_table_def 
)
overridevirtual

Default rename_table() and delete_table() rename/delete files with a given name and extensions from handlerton::file_extensions.

These methods can be overridden, but their default implementation provide useful functionality.

Parameters
[in]fromPath for the old table name.
[in]toPath for the new table name.
[in]from_table_defOld version of definition for table being renamed (i.e. prior to rename).
[in,out]to_table_defNew version of definition for table being renamed. Storage engines which support atomic DDL (i.e. having HTON_SUPPORTS_ATOMIC_DDL flag set) are allowed to adjust this object.
Return values
>0Error.
0Success.

Reimplemented from handler.

◆ reset()

int ha_heap::reset ( void  )
overridevirtual

Reset state of file to after 'open'.

This function is called after every statement for all tables used by that statement.

Reimplemented from handler.

◆ rnd_init()

int ha_heap::rnd_init ( bool  scan)
overridevirtual

rnd_init() can be called two times without rnd_end() in between (it only makes sense if scan=1).

then the second call should prepare for the new table scan (e.g if rnd_init allocates the cursor, second call should position it to the start of the table, no need to deallocate and allocate it again

Implements handler.

◆ rnd_next()

int ha_heap::rnd_next ( uchar buf)
overridevirtual
See also
index_read_map().

Implements handler.

◆ rnd_pos()

int ha_heap::rnd_pos ( uchar buf,
uchar pos 
)
overridevirtual
See also
index_read_map().

Implements handler.

◆ scan_time()

double ha_heap::scan_time ( )
inlineoverridevirtual
Deprecated:
This function is deprecated and will be removed in a future version. Use table_scan_cost() instead.

Reimplemented from handler.

◆ set_keys_for_scanning()

void ha_heap::set_keys_for_scanning ( void  )

◆ store_lock()

THR_LOCK_DATA ** ha_heap::store_lock ( THD thd,
THR_LOCK_DATA **  to,
enum thr_lock_type  lock_type 
)
overridevirtual

Is not invoked for non-transactional temporary tables.

Note
store_lock() can return more than one lock if the table is MERGE or partitioned.
that one can NOT rely on table->in_use in store_lock(). It may refer to a different thread if called from mysql_lock_abort_for_thread().
If the table is MERGE, store_lock() can return less locks than lock_count() claimed. This can happen when the MERGE children are not attached when this is called from another thread.

The idea with handler::store_lock() is the following:

The statement decided which locks we should need for the table for updates/deletes/inserts we get WRITE locks, for SELECT... we get read locks.

Before adding the lock into the table lock handler (see thr_lock.c) mysqld calls store lock with the requested locks. Store lock can now modify a write lock to a read lock (or some other lock), ignore the lock (if we don't want to use MySQL table locks at all) or add locks for many tables (like we do when we are using a MERGE handler).

In some exceptional cases MySQL may send a request for a TL_IGNORE; This means that we are requesting the same lock as last time and this should also be ignored.

Called from lock.cc by get_lock_data().

Implements handler.

◆ table_flags()

ulonglong ha_heap::table_flags ( void  ) const
inlineoverridevirtual

Implements handler.

◆ table_type()

const char * ha_heap::table_type ( ) const
overridevirtual

The following can be called without an open handler.

Implements handler.

◆ update_create_info()

void ha_heap::update_create_info ( HA_CREATE_INFO create_info)
overridevirtual

Update create info as part of ALTER TABLE.

Forward this handler call to the storage engine foreach partition handler. The data_file_name for each partition may need to be reset if the tablespace was moved. Use a dummy HA_CREATE_INFO structure and transfer necessary data.

Parameters
create_infoCreate info from ALTER TABLE.

Reimplemented from handler.

◆ update_key_stats()

void ha_heap::update_key_stats ( )
private

Update index statistics for the table.

◆ update_row()

int ha_heap::update_row ( const uchar old_data,
uchar new_data 
)
overridevirtual

Update a single row.

Note: If HA_ERR_FOUND_DUPP_KEY is returned, the handler must read all columns of the row so MySQL can create an error message. If the columns required for the error message are not read, the error message will contain garbage.

Reimplemented from handler.

◆ write_row()

int ha_heap::write_row ( uchar buf)
overridevirtual

Write a row.

write_row() inserts a row. buf is a byte array of data, normally record[0].

You can use the field information to extract the data from the native byte array type.

Example of this would be: for (Field **field=table->field ; *field ; field++) { ... }

Parameters
bufBuffer to write from.
Returns
Operation status.
Return values
0Success.
!=0 Error code.

Reimplemented from handler.

Member Data Documentation

◆ file

HP_INFO* ha_heap::file {nullptr}
private

◆ internal_share

HP_SHARE* ha_heap::internal_share {nullptr}
private

◆ key_stat_version

uint ha_heap::key_stat_version {0}
private

◆ records_changed

uint ha_heap::records_changed {0}
private

◆ single_instance

bool ha_heap::single_instance {false}
private

True if only one ha_heap is to exist for the table.


The documentation for this class was generated from the following files: