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mariadb/storage/innobase/include/trx0rec.h
Marko Mäkelä a4948dafcd MDEV-11369 Instant ADD COLUMN for InnoDB 
For InnoDB tables, adding, dropping and reordering columns has
required a rebuild of the table and all its indexes. Since MySQL 5.6
(and MariaDB 10.0) this has been supported online (LOCK=NONE), allowing
concurrent modification of the tables.

This work revises the InnoDB ROW_FORMAT=REDUNDANT, ROW_FORMAT=COMPACT
and ROW_FORMAT=DYNAMIC so that columns can be appended instantaneously,
with only minor changes performed to the table structure. The counter
innodb_instant_alter_column in INFORMATION_SCHEMA.GLOBAL_STATUS
is incremented whenever a table rebuild operation is converted into
an instant ADD COLUMN operation.

ROW_FORMAT=COMPRESSED tables will not support instant ADD COLUMN.

Some usability limitations will be addressed in subsequent work:

MDEV-13134 Introduce ALTER TABLE attributes ALGORITHM=NOCOPY
and ALGORITHM=INSTANT
MDEV-14016 Allow instant ADD COLUMN, ADD INDEX, LOCK=NONE

The format of the clustered index (PRIMARY KEY) is changed as follows:

(1) The FIL_PAGE_TYPE of the root page will be FIL_PAGE_TYPE_INSTANT,
and a new field PAGE_INSTANT will contain the original number of fields
in the clustered index ('core' fields).
If instant ADD COLUMN has not been used or the table becomes empty,
or the very first instant ADD COLUMN operation is rolled back,
the fields PAGE_INSTANT and FIL_PAGE_TYPE will be reset
to 0 and FIL_PAGE_INDEX.

(2) A special 'default row' record is inserted into the leftmost leaf,
between the page infimum and the first user record. This record is
distinguished by the REC_INFO_MIN_REC_FLAG, and it is otherwise in the
same format as records that contain values for the instantly added
columns. This 'default row' always has the same number of fields as
the clustered index according to the table definition. The values of
'core' fields are to be ignored. For other fields, the 'default row'
will contain the default values as they were during the ALTER TABLE
statement. (If the column default values are changed later, those
values will only be stored in the .frm file. The 'default row' will
contain the original evaluated values, which must be the same for
every row.) The 'default row' must be completely hidden from
higher-level access routines. Assertions have been added to ensure
that no 'default row' is ever present in the adaptive hash index
or in locked records. The 'default row' is never delete-marked.

(3) In clustered index leaf page records, the number of fields must
reside between the number of 'core' fields (dict_index_t::n_core_fields
introduced in this work) and dict_index_t::n_fields. If the number
of fields is less than dict_index_t::n_fields, the missing fields
are replaced with the column value of the 'default row'.
Note: The number of fields in the record may shrink if some of the
last instantly added columns are updated to the value that is
in the 'default row'. The function btr_cur_trim() implements this
'compression' on update and rollback; dtuple::trim() implements it
on insert.

(4) In ROW_FORMAT=COMPACT and ROW_FORMAT=DYNAMIC records, the new
status value REC_STATUS_COLUMNS_ADDED will indicate the presence of
a new record header that will encode n_fields-n_core_fields-1 in
1 or 2 bytes. (In ROW_FORMAT=REDUNDANT records, the record header
always explicitly encodes the number of fields.)

We introduce the undo log record type TRX_UNDO_INSERT_DEFAULT for
covering the insert of the 'default row' record when instant ADD COLUMN
is used for the first time. Subsequent instant ADD COLUMN can use
TRX_UNDO_UPD_EXIST_REC.

This is joint work with Vin Chen (陈福荣) from Tencent. The design
that was discussed in April 2017 would not have allowed import or
export of data files, because instead of the 'default row' it would
have introduced a data dictionary table. The test
rpl.rpl_alter_instant is exactly as contributed in pull request #408.
The test innodb.instant_alter is based on a contributed test.

The redo log record format changes for ROW_FORMAT=DYNAMIC and
ROW_FORMAT=COMPACT are as contributed. (With this change present,
crash recovery from MariaDB 10.3.1 will fail in spectacular ways!)
Also the semantics of higher-level redo log records that modify the
PAGE_INSTANT field is changed. The redo log format version identifier
was already changed to LOG_HEADER_FORMAT_CURRENT=103 in MariaDB 10.3.1.

Everything else has been rewritten by me. Thanks to Elena Stepanova,
the code has been tested extensively.

When rolling back an instant ADD COLUMN operation, we must empty the
PAGE_FREE list after deleting or shortening the 'default row' record,
by calling either btr_page_empty() or btr_page_reorganize(). We must
know the size of each entry in the PAGE_FREE list. If rollback left a
freed copy of the 'default row' in the PAGE_FREE list, we would be
unable to determine its size (if it is in ROW_FORMAT=COMPACT or
ROW_FORMAT=DYNAMIC) because it would contain more fields than the
rolled-back definition of the clustered index.

UNIV_SQL_DEFAULT: A new special constant that designates an instantly
added column that is not present in the clustered index record.

len_is_stored(): Check if a length is an actual length. There are
two magic length values: UNIV_SQL_DEFAULT, UNIV_SQL_NULL.

dict_col_t::def_val: The 'default row' value of the column.  If the
column is not added instantly, def_val.len will be UNIV_SQL_DEFAULT.

dict_col_t: Add the accessors is_virtual(), is_nullable(), is_instant(),
instant_value().

dict_col_t::remove_instant(): Remove the 'instant ADD' status of
a column.

dict_col_t::name(const dict_table_t& table): Replaces
dict_table_get_col_name().

dict_index_t::n_core_fields: The original number of fields.
For secondary indexes and if instant ADD COLUMN has not been used,
this will be equal to dict_index_t::n_fields.

dict_index_t::n_core_null_bytes: Number of bytes needed to
represent the null flags; usually equal to UT_BITS_IN_BYTES(n_nullable).

dict_index_t::NO_CORE_NULL_BYTES: Magic value signalling that
n_core_null_bytes was not initialized yet from the clustered index
root page.

dict_index_t: Add the accessors is_instant(), is_clust(),
get_n_nullable(), instant_field_value().

dict_index_t::instant_add_field(): Adjust clustered index metadata
for instant ADD COLUMN.

dict_index_t::remove_instant(): Remove the 'instant ADD' status
of a clustered index when the table becomes empty, or the very first
instant ADD COLUMN operation is rolled back.

dict_table_t: Add the accessors is_instant(), is_temporary(),
supports_instant().

dict_table_t::instant_add_column(): Adjust metadata for
instant ADD COLUMN.

dict_table_t::rollback_instant(): Adjust metadata on the rollback
of instant ADD COLUMN.

prepare_inplace_alter_table_dict(): First create the ctx->new_table,
and only then decide if the table really needs to be rebuilt.
We must split the creation of table or index metadata from the
creation of the dictionary table records and the creation of
the data. In this way, we can transform a table-rebuilding operation
into an instant ADD COLUMN operation. Dictionary objects will only
be added to cache when table rebuilding or index creation is needed.
The ctx->instant_table will never be added to cache.

dict_table_t::add_to_cache(): Modified and renamed from
dict_table_add_to_cache(). Do not modify the table metadata.
Let the callers invoke dict_table_add_system_columns() and if needed,
set can_be_evicted.

dict_create_sys_tables_tuple(), dict_create_table_step(): Omit the
system columns (which will now exist in the dict_table_t object
already at this point).

dict_create_table_step(): Expect the callers to invoke
dict_table_add_system_columns().

pars_create_table(): Before creating the table creation execution
graph, invoke dict_table_add_system_columns().

row_create_table_for_mysql(): Expect all callers to invoke
dict_table_add_system_columns().

create_index_dict(): Replaces row_merge_create_index_graph().

innodb_update_n_cols(): Renamed from innobase_update_n_virtual().
Call my_error() if an error occurs.

btr_cur_instant_init(), btr_cur_instant_init_low(),
btr_cur_instant_root_init():
Load additional metadata from the clustered index and set
dict_index_t::n_core_null_bytes. This is invoked
when table metadata is first loaded into the data dictionary.

dict_boot(): Initialize n_core_null_bytes for the four hard-coded
dictionary tables.

dict_create_index_step(): Initialize n_core_null_bytes. This is
executed as part of CREATE TABLE.

dict_index_build_internal_clust(): Initialize n_core_null_bytes to
NO_CORE_NULL_BYTES if table->supports_instant().

row_create_index_for_mysql(): Initialize n_core_null_bytes for
CREATE TEMPORARY TABLE.

commit_cache_norebuild(): Call the code to rename or enlarge columns
in the cache only if instant ADD COLUMN is not being used.
(Instant ADD COLUMN would copy all column metadata from
instant_table to old_table, including the names and lengths.)

PAGE_INSTANT: A new 13-bit field for storing dict_index_t::n_core_fields.
This is repurposing the 16-bit field PAGE_DIRECTION, of which only the
least significant 3 bits were used. The original byte containing
PAGE_DIRECTION will be accessible via the new constant PAGE_DIRECTION_B.

page_get_instant(), page_set_instant(): Accessors for the PAGE_INSTANT.

page_ptr_get_direction(), page_get_direction(),
page_ptr_set_direction(): Accessors for PAGE_DIRECTION.

page_direction_reset(): Reset PAGE_DIRECTION, PAGE_N_DIRECTION.

page_direction_increment(): Increment PAGE_N_DIRECTION
and set PAGE_DIRECTION.

rec_get_offsets(): Use the 'leaf' parameter for non-debug purposes,
and assume that heap_no is always set.
Initialize all dict_index_t::n_fields for ROW_FORMAT=REDUNDANT records,
even if the record contains fewer fields.

rec_offs_make_valid(): Add the parameter 'leaf'.

rec_copy_prefix_to_dtuple(): Assert that the tuple is only built
on the core fields. Instant ADD COLUMN only applies to the
clustered index, and we should never build a search key that has
more than the PRIMARY KEY and possibly DB_TRX_ID,DB_ROLL_PTR.
All these columns are always present.

dict_index_build_data_tuple(): Remove assertions that would be
duplicated in rec_copy_prefix_to_dtuple().

rec_init_offsets(): Support ROW_FORMAT=REDUNDANT records whose
number of fields is between n_core_fields and n_fields.

cmp_rec_rec_with_match(): Implement the comparison between two
MIN_REC_FLAG records.

trx_t::in_rollback: Make the field available in non-debug builds.

trx_start_for_ddl_low(): Remove dangerous error-tolerance.
A dictionary transaction must be flagged as such before it has generated
any undo log records. This is because trx_undo_assign_undo() will mark
the transaction as a dictionary transaction in the undo log header
right before the very first undo log record is being written.

btr_index_rec_validate(): Account for instant ADD COLUMN

row_undo_ins_remove_clust_rec(): On the rollback of an insert into
SYS_COLUMNS, revert instant ADD COLUMN in the cache by removing the
last column from the table and the clustered index.

row_search_on_row_ref(), row_undo_mod_parse_undo_rec(), row_undo_mod(),
trx_undo_update_rec_get_update(): Handle the 'default row'
as a special case.

dtuple_t::trim(index): Omit a redundant suffix of an index tuple right
before insert or update. After instant ADD COLUMN, if the last fields
of a clustered index tuple match the 'default row', there is no
need to store them. While trimming the entry, we must hold a page latch,
so that the table cannot be emptied and the 'default row' be deleted.

btr_cur_optimistic_update(), btr_cur_pessimistic_update(),
row_upd_clust_rec_by_insert(), row_ins_clust_index_entry_low():
Invoke dtuple_t::trim() if needed.

row_ins_clust_index_entry(): Restore dtuple_t::n_fields after calling
row_ins_clust_index_entry_low().

rec_get_converted_size(), rec_get_converted_size_comp(): Allow the number
of fields to be between n_core_fields and n_fields. Do not support
infimum,supremum. They are never supposed to be stored in dtuple_t,
because page creation nowadays uses a lower-level method for initializing
them.

rec_convert_dtuple_to_rec_comp(): Assign the status bits based on the
number of fields.

btr_cur_trim(): In an update, trim the index entry as needed. For the
'default row', handle rollback specially. For user records, omit
fields that match the 'default row'.

btr_cur_optimistic_delete_func(), btr_cur_pessimistic_delete():
Skip locking and adaptive hash index for the 'default row'.

row_log_table_apply_convert_mrec(): Replace 'default row' values if needed.
In the temporary file that is applied by row_log_table_apply(),
we must identify whether the records contain the extra header for
instantly added columns. For now, we will allocate an additional byte
for this for ROW_T_INSERT and ROW_T_UPDATE records when the source table
has been subject to instant ADD COLUMN. The ROW_T_DELETE records are
fine, as they will be converted and will only contain 'core' columns
(PRIMARY KEY and some system columns) that are converted from dtuple_t.

rec_get_converted_size_temp(), rec_init_offsets_temp(),
rec_convert_dtuple_to_temp(): Add the parameter 'status'.

REC_INFO_DEFAULT_ROW = REC_INFO_MIN_REC_FLAG | REC_STATUS_COLUMNS_ADDED:
An info_bits constant for distinguishing the 'default row' record.

rec_comp_status_t: An enum of the status bit values.

rec_leaf_format: An enum that replaces the bool parameter of
rec_init_offsets_comp_ordinary().
2017-10-06 09:50:10 +03:00

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/*****************************************************************************
Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, MariaDB Corporation.
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 Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/trx0rec.h
Transaction undo log record
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#ifndef trx0rec_h
#define trx0rec_h
#include "univ.i"
#include "trx0types.h"
#include "row0types.h"
#include "mtr0mtr.h"
#include "dict0types.h"
#include "data0data.h"
#include "rem0types.h"
#include "page0types.h"
#include "row0log.h"
#include "que0types.h"
/***********************************************************************//**
Copies the undo record to the heap.
@return own: copy of undo log record */
UNIV_INLINE
trx_undo_rec_t*
trx_undo_rec_copy(
/*==============*/
const trx_undo_rec_t* undo_rec, /*!< in: undo log record */
mem_heap_t* heap); /*!< in: heap where copied */
/**********************************************************************//**
Reads the undo log record type.
@return record type */
UNIV_INLINE
ulint
trx_undo_rec_get_type(
/*==================*/
const trx_undo_rec_t* undo_rec); /*!< in: undo log record */
/**********************************************************************//**
Reads the undo log record number.
@return undo no */
UNIV_INLINE
undo_no_t
trx_undo_rec_get_undo_no(
/*=====================*/
const trx_undo_rec_t* undo_rec); /*!< in: undo log record */
/**********************************************************************//**
Returns the start of the undo record data area. */
#define trx_undo_rec_get_ptr(undo_rec, undo_no) \
((undo_rec) + trx_undo_rec_get_offset(undo_no))
/**********************************************************************//**
Reads from an undo log record the general parameters.
@return remaining part of undo log record after reading these values */
byte*
trx_undo_rec_get_pars(
/*==================*/
trx_undo_rec_t* undo_rec, /*!< in: undo log record */
ulint* type, /*!< out: undo record type:
TRX_UNDO_INSERT_REC, ... */
ulint* cmpl_info, /*!< out: compiler info, relevant only
for update type records */
bool* updated_extern, /*!< out: true if we updated an
externally stored fild */
undo_no_t* undo_no, /*!< out: undo log record number */
table_id_t* table_id) /*!< out: table id */
MY_ATTRIBUTE((nonnull));
/*******************************************************************//**
Builds a row reference from an undo log record.
@return pointer to remaining part of undo record */
byte*
trx_undo_rec_get_row_ref(
/*=====================*/
byte* ptr, /*!< in: remaining part of a copy of an undo log
record, at the start of the row reference;
NOTE that this copy of the undo log record must
be preserved as long as the row reference is
used, as we do NOT copy the data in the
record! */
dict_index_t* index, /*!< in: clustered index */
const dtuple_t**ref, /*!< out, own: row reference */
mem_heap_t* heap); /*!< in: memory heap from which the memory
needed is allocated */
/**********************************************************************//**
Reads from an undo log update record the system field values of the old
version.
@return remaining part of undo log record after reading these values */
byte*
trx_undo_update_rec_get_sys_cols(
/*=============================*/
const byte* ptr, /*!< in: remaining part of undo
log record after reading
general parameters */
trx_id_t* trx_id, /*!< out: trx id */
roll_ptr_t* roll_ptr, /*!< out: roll ptr */
ulint* info_bits); /*!< out: info bits state */
/*******************************************************************//**
Builds an update vector based on a remaining part of an undo log record.
@return remaining part of the record, NULL if an error detected, which
means that the record is corrupted */
byte*
trx_undo_update_rec_get_update(
/*===========================*/
const byte* ptr, /*!< in: remaining part in update undo log
record, after reading the row reference
NOTE that this copy of the undo log record must
be preserved as long as the update vector is
used, as we do NOT copy the data in the
record! */
dict_index_t* index, /*!< in: clustered index */
ulint type, /*!< in: TRX_UNDO_UPD_EXIST_REC,
TRX_UNDO_UPD_DEL_REC, or
TRX_UNDO_DEL_MARK_REC; in the last case,
only trx id and roll ptr fields are added to
the update vector */
trx_id_t trx_id, /*!< in: transaction id from this undorecord */
roll_ptr_t roll_ptr,/*!< in: roll pointer from this undo record */
ulint info_bits,/*!< in: info bits from this undo record */
mem_heap_t* heap, /*!< in: memory heap from which the memory
needed is allocated */
upd_t** upd); /*!< out, own: update vector */
/*******************************************************************//**
Builds a partial row from an update undo log record, for purge.
It contains the columns which occur as ordering in any index of the table.
Any missing columns are indicated by col->mtype == DATA_MISSING.
@return pointer to remaining part of undo record */
byte*
trx_undo_rec_get_partial_row(
/*=========================*/
const byte* ptr, /*!< in: remaining part in update undo log
record of a suitable type, at the start of
the stored index columns;
NOTE that this copy of the undo log record must
be preserved as long as the partial row is
used, as we do NOT copy the data in the
record! */
dict_index_t* index, /*!< in: clustered index */
dtuple_t** row, /*!< out, own: partial row */
ibool ignore_prefix, /*!< in: flag to indicate if we
expect blob prefixes in undo. Used
only in the assertion. */
mem_heap_t* heap) /*!< in: memory heap from which the memory
needed is allocated */
MY_ATTRIBUTE((nonnull, warn_unused_result));
/***********************************************************************//**
Writes information to an undo log about an insert, update, or a delete marking
of a clustered index record. This information is used in a rollback of the
transaction and in consistent reads that must look to the history of this
transaction.
@return DB_SUCCESS or error code */
dberr_t
trx_undo_report_row_operation(
/*==========================*/
que_thr_t* thr, /*!< in: query thread */
dict_index_t* index, /*!< in: clustered index */
const dtuple_t* clust_entry, /*!< in: in the case of an insert,
index entry to insert into the
clustered index; in updates,
may contain a clustered index
record tuple that also contains
virtual columns of the table;
otherwise, NULL */
const upd_t* update, /*!< in: in the case of an update,
the update vector, otherwise NULL */
ulint cmpl_info, /*!< in: compiler info on secondary
index updates */
const rec_t* rec, /*!< in: case of an update or delete
marking, the record in the clustered
index; NULL if insert */
const ulint* offsets, /*!< in: rec_get_offsets(rec) */
roll_ptr_t* roll_ptr) /*!< out: rollback pointer to the
inserted undo log record,
0 if BTR_NO_UNDO_LOG
flag was specified */
MY_ATTRIBUTE((nonnull(1,2,8), warn_unused_result));
/** status bit used for trx_undo_prev_version_build() */
/** TRX_UNDO_PREV_IN_PURGE tells trx_undo_prev_version_build() that it
is being called purge view and we would like to get the purge record
even it is in the purge view (in normal case, it will return without
fetching the purge record */
#define TRX_UNDO_PREV_IN_PURGE 0x1
/** This tells trx_undo_prev_version_build() to fetch the old value in
the undo log (which is the after image for an update) */
#define TRX_UNDO_GET_OLD_V_VALUE 0x2
/*******************************************************************//**
Build a previous version of a clustered index record. The caller must
hold a latch on the index page of the clustered index record.
@retval true if previous version was built, or if it was an insert
or the table has been rebuilt
@retval false if the previous version is earlier than purge_view,
which means that it may have been removed */
bool
trx_undo_prev_version_build(
/*========================*/
const rec_t* index_rec,/*!< in: clustered index record in the
index tree */
mtr_t* index_mtr,/*!< in: mtr which contains the latch to
index_rec page and purge_view */
const rec_t* rec, /*!< in: version of a clustered index record */
dict_index_t* index, /*!< in: clustered index */
ulint* offsets,/*!< in/out: rec_get_offsets(rec, index) */
mem_heap_t* heap, /*!< in: memory heap from which the memory
needed is allocated */
rec_t** old_vers,/*!< out, own: previous version, or NULL if
rec is the first inserted version, or if
history data has been deleted */
mem_heap_t* v_heap, /* !< in: memory heap used to create vrow
dtuple if it is not yet created. This heap
diffs from "heap" above in that it could be
prebuilt->old_vers_heap for selection */
const dtuple_t**vrow, /*!< out: virtual column info, if any */
ulint v_status);
/*!< in: status determine if it is going
into this function by purge thread or not.
And if we read "after image" of undo log */
/***********************************************************//**
Parses a redo log record of adding an undo log record.
@return end of log record or NULL */
byte*
trx_undo_parse_add_undo_rec(
/*========================*/
byte* ptr, /*!< in: buffer */
byte* end_ptr,/*!< in: buffer end */
page_t* page); /*!< in: page or NULL */
/***********************************************************//**
Parses a redo log record of erasing of an undo page end.
@return end of log record or NULL */
byte*
trx_undo_parse_erase_page_end(
/*==========================*/
byte* ptr, /*!< in: buffer */
byte* end_ptr,/*!< in: buffer end */
page_t* page, /*!< in: page or NULL */
mtr_t* mtr); /*!< in: mtr or NULL */
/** Read from an undo log record a non-virtual column value.
@param[in,out] ptr pointer to remaining part of the undo record
@param[in,out] field stored field
@param[in,out] len length of the field, or UNIV_SQL_NULL
@param[in,out] orig_len original length of the locally stored part
of an externally stored column, or 0
@return remaining part of undo log record after reading these values */
byte*
trx_undo_rec_get_col_val(
const byte* ptr,
const byte** field,
ulint* len,
ulint* orig_len);
/** Read virtual column value from undo log
@param[in] table the table
@param[in] ptr undo log pointer
@param[in,out] row the dtuple to fill
@param[in] in_purge called by purge thread
@param[in] col_map online rebuild column map */
void
trx_undo_read_v_cols(
const dict_table_t* table,
const byte* ptr,
const dtuple_t* row,
bool in_purge,
const ulint* col_map);
/** Read virtual column index from undo log if the undo log contains such
info, and verify the column is still indexed, and output its position
@param[in] table the table
@param[in] ptr undo log pointer
@param[in] first_v_col if this is the first virtual column, which
has the version marker
@param[in,out] is_undo_log his function is used to parse both undo log,
and online log for virtual columns. So
check to see if this is undo log
@param[out] field_no the column number
@return remaining part of undo log record after reading these values */
const byte*
trx_undo_read_v_idx(
const dict_table_t* table,
const byte* ptr,
bool first_v_col,
bool* is_undo_log,
ulint* field_no);
/* Types of an undo log record: these have to be smaller than 16, as the
compilation info multiplied by 16 is ORed to this value in an undo log
record */
#define TRX_UNDO_INSERT_DEFAULT 10 /* insert a "default value"
pseudo-record for instant ALTER */
#define TRX_UNDO_INSERT_REC 11 /* fresh insert into clustered index */
#define TRX_UNDO_UPD_EXIST_REC 12 /* update of a non-delete-marked
record */
#define TRX_UNDO_UPD_DEL_REC 13 /* update of a delete marked record to
a not delete marked record; also the
fields of the record can change */
#define TRX_UNDO_DEL_MARK_REC 14 /* delete marking of a record; fields
do not change */
#define TRX_UNDO_CMPL_INFO_MULT 16U /* compilation info is multiplied by
this and ORed to the type above */
#define TRX_UNDO_UPD_EXTERN 128U /* This bit can be ORed to type_cmpl
to denote that we updated external
storage fields: used by purge to
free the external storage */
/** The search tuple corresponding to TRX_UNDO_INSERT_DEFAULT */
extern const dtuple_t trx_undo_default_rec;
#include "trx0rec.ic"
#endif /* trx0rec_h */
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