buf_flush_init_for_writing(): Remove the parameter skip_checksum.

fsp_init_file_page_low(): Always initialize the page.

There were some differences on MariaDB compared with MySQL.
Fix these differences.

MDEV-15420 Wrong result for CAST from TIME or DATETIME with zero integer part and non-zero microseconds to DECIMAL(X,Y)

The loop in ull2dec() does not iterate if "from" is zero,
so to->intg got erroneously set to 0 instead of 1.
Because if this, my_decimal2seconds() wrote the fractional
part into a wrong buf[x].

Catching the special case with zero "from" and properly initialize "to"
using decimal_make_zero().

MDEV-14814: encryption.innodb_encryption-page-compression failed in buildbot with timeout on wait condition

Fix wrong wait condition.

fix the compilation error.
no support for plugins yet.

rocksdb and spider

despite the name, it logs both stdout and stderr

tokudb apparently requires perfschema now

Analysis:- The problem  is the change in the implementation of wait_for_listen
in wsrep_sst_xtrabackup-v2.sh. The new script uses lsof which will always
exit with an error code if it can't find all the items, and because the
script has the -e option set in the hashbang line (#!/bin/bash -ue), the
script will abort right after running lsof if lsof can't find even a single
item among all the items listed in its arguments. This will happen even if
socat is running and listening, because it can't find nc. The loop in
wait_for_listen will therefore always quit after one iteration without
writing the "ready" line to signal the parent.

Solution:- We will or the lsof with true.

Patch Credit :Daniel Black and David Wang

Part #2: some transactions have m_rocksdb_tx==NULL (and most functions of
Rdb_transction_impl handle this case. Do like they do)

Make MyRocks' non-XA commit path to first do the commit without syncing
and then sync.

a) We do not need this on Windows, and it is not clear what it does,inside
service.

b) It hinders debugging.
mysql-test-run.pl --debugger=vsjitdebugger more often than , would stop here
throwing "invalid handle" exception.

* galera_gtid_slave
* galera_unicode_identifiers

            the non-recursive CTE via prepared statement

The problem appears as the column names of the CTE were allocated on the
wrong MEMROOT and after the preparation of the statement they disappear.

To fix it in the procedure With_element::rename_columns_of_derived_unit
the CTE column names are now allocated in the permanent MEMROOT for the
prepared statements and stored procedures.

This reverts commit 0ea45725,
since it breaks clang

fsp_fill_free_list(): Correctly determine whether the temporary
tablespace file should be extended in order to respond to a
page allocation request. The inverted condition was noticed
by Thiru when he analyzed MDEV-13013.

Added more files affected by GCC ICE:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67143

Added missing include.

srv_conc_t::n_active: Correct the comment, and remove an
assertion that trivially holds now that the type is unsigned.

MDEV-14814: encryption.innodb_encryption-page-compression failed in buildbot with timeout on wait condition

Test changes only.

pages.

For some simple benchmarks, a majority of time was
spend in find_head() which tries to find the best
place to put the record.

The result of this patch is a 2x or more speedup for
inserts without keys for format PAGE. All changes
are only related to how rows are stored

Should fix some of the problems mentioned in:
MDEV-8132 Temporary tables using Aria with very poor performance
MDEV-9079 Aria very slow for internal temporary tables
MDEV-5841 Mariadb very poor temporary performance

The following changes where done:
- For rows with a small row length that fits into
  a page (818 bytes with 8192 pages), stop as soon as we
  hit a match.
- Added markers full_head_size and full_tail_size that tells
  us where to start searching on the bitmap page
- Ensure that page->used_size is correctly updated when
  bitmap grows. This allows us to stop searching at used_size
- Added code to check that the bitmap variables are correct.
- Fixed a wrong test where we set "first_bitmap_with_space".
  This shouldn't have caused any notable problems.