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MySQL 5.6.14 Source Code Document
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MySQL 5.6.14 Source Code Document
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#include <row0mysql.h>
A struct for (sometimes lazily) prebuilt structures in an Innobase table
handle used within MySQL; these are used to save CPU time.
Definition at line 658 of file row0mysql.h.
| dberr_t row_prebuilt_t::autoinc_error |
The actual error code encountered while trying to init or read the autoinc value from the table. We store it here so that we can return it to MySQL
Definition at line 855 of file row0mysql.h.
| ulonglong row_prebuilt_t::autoinc_increment |
The increment step of the auto increment column. Value must be greater than or equal to 1. Required to calculate the next value
Definition at line 848 of file row0mysql.h.
| ulonglong row_prebuilt_t::autoinc_last_value |
last value of AUTO-INC interval
Definition at line 847 of file row0mysql.h.
| ulonglong row_prebuilt_t::autoinc_offset |
The offset passed to get_auto_increment() by MySQL. Required to calculate the next value
Definition at line 852 of file row0mysql.h.
| mem_heap_t* row_prebuilt_t::blob_heap |
in SELECTS BLOB fields are copied to this heap
Definition at line 840 of file row0mysql.h.
| unsigned row_prebuilt_t::clust_index_was_generated |
if the user did not define a primary key in MySQL, then Innobase automatically generated a clustered index where the ordering column is the row id: in this case this flag is set to TRUE
Definition at line 676 of file row0mysql.h.
| btr_pcur_t row_prebuilt_t::clust_pcur |
persistent cursor used in some selects and updates
Definition at line 752 of file row0mysql.h.
| dtuple_t* row_prebuilt_t::clust_ref |
prebuilt dtuple used in sel/upd/del
Definition at line 768 of file row0mysql.h.
| const byte* row_prebuilt_t::default_rec |
the default values of all columns (a "default row") in MySQL format
Definition at line 730 of file row0mysql.h.
| byte* row_prebuilt_t::fetch_cache[MYSQL_FETCH_CACHE_SIZE] |
a cache for fetched rows if we fetch many rows from the same cursor: it saves CPU time to fetch them in a batch; we reserve mysql_row_len bytes for each such row; these pointers point 4 bytes past the allocated mem buf start, because there is a 4 byte magic number at the start and at the end
Definition at line 823 of file row0mysql.h.
| ulint row_prebuilt_t::fetch_cache_first |
position of the first not yet fetched row in fetch_cache
Definition at line 836 of file row0mysql.h.
| ulint row_prebuilt_t::fetch_direction |
ROW_SEL_NEXT or ROW_SEL_PREV
Definition at line 821 of file row0mysql.h.
| mem_heap_t* row_prebuilt_t::heap |
memory heap from which these auxiliary structures are allocated when needed
Definition at line 721 of file row0mysql.h.
| ulint row_prebuilt_t::hint_need_to_fetch_extra_cols |
normally this is set to 0; if this is set to ROW_RETRIEVE_PRIMARY_KEY, then we should at least retrieve all columns in the primary key; if this is set to ROW_RETRIEVE_ALL_COLS, then we must retrieve all columns in the key (if read_just_key == 1), or all columns in the table
Definition at line 733 of file row0mysql.h.
| void* row_prebuilt_t::idx_cond |
In ICP, pointer to a ha_innobase, passed to innobase_index_cond(). NULL if index condition pushdown is not used.
Definition at line 861 of file row0mysql.h.
| ulint row_prebuilt_t::idx_cond_n_cols |
Number of fields in idx_cond_cols. 0 if and only if idx_cond == NULL.
Definition at line 865 of file row0mysql.h.
| bool row_prebuilt_t::in_fts_query |
Whether we are in a FTS query
Definition at line 844 of file row0mysql.h.
| dict_index_t* row_prebuilt_t::index |
current index for a search, if any
Definition at line 664 of file row0mysql.h.
| unsigned row_prebuilt_t::index_usable |
caches the value of row_merge_is_index_usable(trx,index)
Definition at line 682 of file row0mysql.h.
| unsigned row_prebuilt_t::innodb_api |
whether this is a InnoDB API query
Definition at line 871 of file row0mysql.h.
| const rec_t* row_prebuilt_t::innodb_api_rec |
InnoDB API search result
Definition at line 873 of file row0mysql.h.
| que_fork_t* row_prebuilt_t::ins_graph |
Innobase SQL query graph used in inserts. Will be rebuilt on trx_id or n_indexes mismatch.
Definition at line 745 of file row0mysql.h.
| ins_node_t* row_prebuilt_t::ins_node |
Innobase SQL insert node used to perform inserts to the table
Definition at line 724 of file row0mysql.h.
| byte* row_prebuilt_t::ins_upd_rec_buff |
buffer for storing data converted to the Innobase format from the MySQL format
Definition at line 727 of file row0mysql.h.
| ibool row_prebuilt_t::keep_other_fields_on_keyread |
when using fetch cache with HA_EXTRA_KEYREAD, don't overwrite other fields in mysql row row buffer.
Definition at line 832 of file row0mysql.h.
| ulint row_prebuilt_t::magic_n |
this magic number is set to ROW_PREBUILT_ALLOCATED when created, or ROW_PREBUILT_FREED when the struct has been freed
Definition at line 659 of file row0mysql.h.
| ulint row_prebuilt_t::magic_n2 |
this should be the same as magic_n
Definition at line 868 of file row0mysql.h.
| unsigned row_prebuilt_t::mysql_has_locked |
this is set TRUE when MySQL calls external_lock on this handle with a lock flag, and set FALSE when with the F_UNLOCK flag
Definition at line 671 of file row0mysql.h.
| ulint row_prebuilt_t::mysql_prefix_len |
byte offset of the end of the last requested column
Definition at line 815 of file row0mysql.h.
| ulint row_prebuilt_t::mysql_row_len |
length in bytes of a row in the MySQL format
Definition at line 817 of file row0mysql.h.
| mysql_row_templ_t* row_prebuilt_t::mysql_template |
template used to transform rows fast between MySQL and Innobase formats; memory for this template is not allocated from 'heap'
Definition at line 717 of file row0mysql.h.
| ulint row_prebuilt_t::n_fetch_cached |
number of not yet fetched rows in fetch_cache
Definition at line 838 of file row0mysql.h.
| ulint row_prebuilt_t::n_rows_fetched |
number of rows fetched after positioning the current cursor
Definition at line 819 of file row0mysql.h.
| unsigned row_prebuilt_t::n_template |
number of elements in the template
Definition at line 701 of file row0mysql.h.
| unsigned row_prebuilt_t::need_to_access_clustered |
if we are fetching columns through a secondary index and at least one column is not in the secondary index, then this is set to TRUE
Definition at line 706 of file row0mysql.h.
| ulint row_prebuilt_t::new_rec_locks |
normally 0; if srv_locks_unsafe_for_binlog is TRUE or session is using READ COMMITTED or READ UNCOMMITTED isolation level, set in row_search_for_mysql() if we set a new record lock on the secondary or clustered index; this is used in row_unlock_for_mysql() when releasing the lock under the cursor if we determine after retrieving the row that it does not need to be locked ('mini-rollback')
Definition at line 801 of file row0mysql.h.
| unsigned row_prebuilt_t::null_bitmap_len |
number of bytes in the SQL NULL bitmap at the start of a row in the MySQL format
Definition at line 703 of file row0mysql.h.
| mem_heap_t* row_prebuilt_t::old_vers_heap |
memory heap where a previous version is built in consistent read
Definition at line 842 of file row0mysql.h.
| btr_pcur_t row_prebuilt_t::pcur |
persistent cursor used in selects and updates
Definition at line 750 of file row0mysql.h.
| unsigned row_prebuilt_t::read_just_key |
set to 1 when MySQL calls ha_innobase::extra with the argument HA_EXTRA_KEYREAD; it is enough to read just columns defined in the index (i.e., no read of the clustered index record necessary)
Definition at line 684 of file row0mysql.h.
| byte row_prebuilt_t::row_id[DATA_ROW_ID_LEN] |
if the clustered index was generated, the row id of the last row fetched is stored here
Definition at line 758 of file row0mysql.h.
| ulint row_prebuilt_t::row_read_type |
ROW_READ_WITH_LOCKS if row locks should be the obtained for records under an UPDATE or DELETE cursor. If innodb_locks_unsafe_for_binlog is TRUE, this can be set to ROW_READ_TRY_SEMI_CONSISTENT, so that if the row under an UPDATE or DELETE cursor was locked by another transaction, InnoDB will resort to reading the last committed value ('semi-consistent read'). Then, this field will be set to ROW_READ_DID_SEMI_CONSISTENT to indicate that. If the row does not match the WHERE condition, MySQL will invoke handler::unlock_row() to clear the flag back to ROW_READ_TRY_SEMI_CONSISTENT and to simply skip the row. If the row matches, the next call to row_search_for_mysql() will lock the row. This eliminates lock waits in some cases; note that this breaks serializability.
Definition at line 776 of file row0mysql.h.
| dtuple_t* row_prebuilt_t::search_tuple |
prebuilt dtuple used in selects
Definition at line 756 of file row0mysql.h.
| que_fork_t* row_prebuilt_t::sel_graph |
dummy query graph used in selects
Definition at line 754 of file row0mysql.h.
| ulint row_prebuilt_t::select_lock_type |
LOCK_NONE, LOCK_S, or LOCK_X
Definition at line 770 of file row0mysql.h.
| unsigned row_prebuilt_t::sql_stat_start |
TRUE when we start processing of an SQL statement: we may have to set an intention lock on the table, create a consistent read view etc.
Definition at line 667 of file row0mysql.h.
| ulint row_prebuilt_t::stored_select_lock_type |
this field is used to remember the original select_lock_type that was decided in ha_innodb.cc, ::store_lock(), ::external_lock(), etc.
Definition at line 771 of file row0mysql.h.
| dict_table_t* row_prebuilt_t::table |
Innobase table handle
Definition at line 663 of file row0mysql.h.
| unsigned row_prebuilt_t::templ_contains_blob |
TRUE if the template contains a column with DATA_BLOB == get_innobase_type_from_mysql_type(); not to be confused with InnoDB externally stored columns (VARCHAR can be off-page too)
Definition at line 711 of file row0mysql.h.
| unsigned row_prebuilt_t::template_type |
ROW_MYSQL_WHOLE_ROW, ROW_MYSQL_REC_FIELDS, ROW_MYSQL_DUMMY_TEMPLATE, or ROW_MYSQL_NO_TEMPLATE
Definition at line 697 of file row0mysql.h.
| trx_t* row_prebuilt_t::trx |
current transaction handle
Definition at line 666 of file row0mysql.h.
| trx_id_t row_prebuilt_t::trx_id |
The table->def_trx_id when ins_graph was built
Definition at line 743 of file row0mysql.h.
| que_fork_t* row_prebuilt_t::upd_graph |
Innobase SQL query graph used in updates or deletes
Definition at line 748 of file row0mysql.h.
| upd_node_t* row_prebuilt_t::upd_node |
Innobase SQL update node used to perform updates and deletes
Definition at line 741 of file row0mysql.h.
| unsigned row_prebuilt_t::used_in_HANDLER |
TRUE if we have been using this handle in a MySQL HANDLER low level index cursor command: then we must store the pcur position even in a unique search from a clustered index, because HANDLER allows NEXT and PREV in such a situation
Definition at line 690 of file row0mysql.h.
1.8.1.2 
