Similar to what was done in commit aa3f7a10
for FULLTEXT INDEX, we must ensure that MLOG_INDEX_LOAD records will always
be written if redo logging was disabled.

row_merge_build_indexes(): Invoke row_merge_write_redo() also when
online operation is not being executed or an error occurs.
In case of an error, invoke flush_observer->interrupted() so that
the pages will not be flushed but merely evicted from the buffer pool.
Before resuming redo logging, it is crucial for the correctness of
mariabackup and InnoDB crash recovery to flush or evict all affected pages
and to write MLOG_INDEX_LOAD records.

innobase_init(): Add a missing space to a warning message.
Apparently, this message was corrupted in MariaDB 10.2.2 in
commit fec844ac related to a
conflict resolution when applying a change from MySQL 5.7.12.

and don't pass BUILD_CONFIG twice, once is enough.

The regression that was reported in MDEV-19212 occurred due to use
of macros that did not ensure that the arguments have compatible
types.

ut_2pow_remainder(), ut_2pow_round(), ut_calc_align(): Define as
inline function templates.

UT_CALC_ALIGN(): Define as a macro, because this is used in
compile_time_assert(). Only starting with C++11 (MariaDB 10.4)
we could define the inline functions as constexpr.

os_mem_alloc_large(): Invoke the macro ut_2pow_round() with the
correct argument type.

innobase_large_page_size, innobase_use_large_pages,
os_use_large_pages, os_large_page_size: Remove.
Simply refer to opt_large_page_size, my_use_large_pages.

xtrabackup_backup_func(): If the log checkpoint header changed
since we last read it, search for the most recent checkpoint again.
Otherwise, we could corrupt the backup of the redo log, because the
least significant bits of checkpoint_lsn_start would not match
log_sys->log.lsn.

btr_page_free(): Renamed from btr_page_free_low().
If scrubbing is enabled, zero out the page with proper redo logging.
Only pass ahi=true to fseg_free_page() if the page is actually indexed.

fil_space_t::modify_check(): Renamed from fsp_space_modify_check().

fsp_init_file_page(): Define inline.

because FindBoost.cmake won't do it

thanks @FaramosCZ

Even if Makefile for some reason was checked in in a submodule,
it is still a generated file, will be cleaned, won't be in a source
package. One cannot jump to conclusions if it doesn't exist.

This is a follow-up to MDEV-18733. As part of that fix, we made
dict_check_sys_tables() skip tables that would be dropped by
row_mysql_drop_garbage_tables().

DICT_ERR_IGNORE_DROP: A new mode where the file should not be attempted
to be opened.

dict_load_tablespace(): Do not try to load the tablespace if
DICT_ERR_IGNORE_DROP has been specified.

row_mysql_drop_garbage_tables(): Pass the DICT_ERR_IGNORE_DROP mode.

fil_space_for_table_exists_in_mem(): Remove a parameter.
The only caller that passed print_error_if_does_not_exist=true
was row_drop_single_table_tablespace().

The recv_sys data structures are accessed not only from the thread
that executes InnoDB plugin initialization, but also from the
InnoDB I/O threads, which can invoke recv_recover_page().

Assert that sufficient concurrency control is in place.
Some code was accessing recv_sys data structures without
holding recv_sys->mutex.

recv_recover_page(bpage): Refactor the call from buf_page_io_complete()
into a separate function that performs necessary steps. The
main thread was unnecessarily releasing and reacquiring recv_sys->mutex.

recv_recover_page(block,mtr,recv_addr): Pass more parameters from
the caller. Avoid redundant lookups and computations. Eliminate some
redundant variables.

recv_get_fil_addr_struct(): Assert that recv_sys->mutex is being held.
That was not always the case!

recv_scan_log_recs(): Acquire recv_sys->mutex for the whole duration
of the function. (While we are scanning and buffering redo log records,
no pages can be read in.)

recv_read_in_area(): Properly protect access with recv_sys->mutex.

recv_apply_hashed_log_recs(): Check recv_addr->state only once,
and continuously hold recv_sys->mutex. The mutex will be released
and reacquired inside recv_recover_page() and recv_read_in_area(),
allowing concurrent processing by buf_page_io_complete() in I/O threads.

The record MLOG_INDEX_LOAD is supposed to be written to indicate that
some page modifications bypassed redo logging, and that redo logging
is now re-enabled. It was not written for fulltext indexes during
ALTER TABLE.

row_merge_write_redo(): Declare globally. Assert that the index
is neither a spatial nor fulltext index.

recv_mlog_index_load(): Observe a MLOG_INDEX_LOAD operation.

recv_parse_log_recs(): Handle MLOG_INDEX_LOAD also in multi-record
mini-transactions. Because of this omission, we should keep writing
MLOG_INDEX_LOAD in single-record mini-transactions, because older
versions of Mariabackup would fail.

row_fts_merge_insert(): Write MLOG_INDEX_LOAD for the auxiliary
tables of fulltext indexes.

The record MLOG_ZIP_PAGE_COMPRESS is similar to MLOG_INIT_FILE_PAGE2
that it contains all the information needed to initialize the page.
Like for the other record, do initialize the entire page on recovery.

The page_size argument to buf_page_get_gen() only matters when the
page is going to be loaded into the buffer pool. Allow callers to
pass a dummy parameter when using BUF_GET_IF_IN_POOL (which would
return NULL if the block is not in the buffer pool).

btr_root_get(): Ignore the root->page.encrypted flag.
The purpose of this flag is questionable since
commit 8c43f963.

btr_validate_index(): Avoid crash if btr_root_get() returns NULL.

btr_free_root(): Add the parameter bool invalidate.

btr_free_root_invalidate(): Remove.

fsp_apply_init_file_page(): Renamed from fsp_init_file_page_low().

fsp_parse_init_file_page(): Remove. The redo log record has no
parameters.

Normally, InnoDB is not in the process of executing crash recovery.
Provide a hint to the compiler that the recovery-related code paths
are rarely executed.

With INFORMATION_SCHEMA set as the default database the check that a table
referred in the processed query is defined in INORMATION_SCHEMA must
be postponed until all CTE names can be identified.

Fixed by adding more rows to a table

Other things:
- Speed up index_merge tests 20% by adding begin/commit around loops that
  generated rows.

Normally, InnoDB will create temporary table names of the form
#sql-ibNNNN, and with innodb_safe_truncate=OFF, #sql-ibNNNN-MMMM.

If InnoDB crash recovery was needed, the InnoDB function srv_start()
would invoke extra validation, reading something from every InnoDB
data file. This should be unnecessary now that MDEV-14717 made
RENAME operations crash-safe inside InnoDB (which can be
disabled in MariaDB 10.2 by setting innodb_safe_truncate=OFF).

dict_check_sys_tables(): Skip tables that would be dropped by
row_mysql_drop_garbage_tables(). Perform extra validation only
if innodb_safe_truncate=OFF, innodb_force_recovery=0 and
crash recovery was needed.

dict_load_table_one(): Validate the root page of the table.
In this way, we can deny access to corrupted or mismatching tables
not only after crash recovery, but also after a clean shutdown.

For some reason, GCC 8 did not issue warnings for all such comparisons.

row_is_mysql_tmp_table_name(): Replaced with
dict_table_t::is_temporary_name() and table_name_t::is_temporary().

table_name_t: Add constructors.

In MariaDB, InnoDB tables will always contain DATA_N_SYS_COLS = 3
columns, 2 or 3 of which are present in the clustered index.
We remove the predicate that was added in MySQL 5.7 as part of WL#7682.