Hiding the definitions inside Type_handler_xxx::name().

This is needed to avoid exporting members with MYSQL_PLUGIN_IMPORT,
which would be needed to compile data type plugins on Windows.

Introducing methods instead:
  const Name version_mysql56() const;
  const Name version_mariadb53() const;

This is needed to avoid exporting members with MYSQL_PLUGIN_IMPORT,
which would be needed to compile data type plugins on Windows.

Follow-up to 9d26f3da:
do not declare a never-overloaded function as virtual.

Closes PR #1385

Rerecord the result file. It was caused by MDEV-20477(967c14c0)

innobase_rename_or_enlarge_column_try(): Relax a debug assertion.
The DATA_VERSIONED bits in dict_col_t::prtype do not affect the
storage format.

Fixed 4-byte length characters handled incorrectly.

Rerecord sysvars_server_notembedded

Problem was that if user used bad wsrep configuration
we call unireg_abort and in wsrep case there is check
to wsrep_server_state that might not yet be initialized.
Fixed by checking that wsrep_server_state is initialized
before checking it's state.

Changes to be committed:
	modified:   sql/mysqld.cc
	modified:   sql/wsrep_server_state.h

In mysql-server/commit@f46329044f8618212923bdf52e15d5b464201edc
the InnoDB function btr_cur_open_at_rnd_pos() was corrected so that
it would return a status that indicates whether the cursor was
successfully positioned. But this change was not correctly merged to
MariaDB in 2e814d47.

btr_cur_open_at_rnd_pos(): In the code path that was introduced in
MDEV-8588, properly return failure status.

No deterministic test case was found for this failure.
It was caught after removing the function
page_copy_rec_list_end_to_created_page() in a development branch.
As a result, the fill factor of index trees would improve, and
supposedly, so would the probability of btr_cur_open_at_rnd_pos()
reaching the intentionally corrupted page in the test
innodb.leaf_page_corrupted_during_recovery.
The wrong return value would cause
btr_estimate_number_of_different_key_vals() to wrongly invoke
btr_rec_get_externally_stored_len() on a non-leaf page and
trigger an assertion failure at the start of that function.

- During trx_undo_report_rename(), InnoDB can fail to write undo log
for it if undo log doesn't fit in the undo page. In that case, InnoDB
adds one more undo log page and retry to write the rename undo log.
But the assert is wrong and it doesn't allow to fail even for one time.

Revert "Part3: MDEV-18156 Assertion `0' failed or `btr_validate_index(index, 0, false)' in row_upd_sec_index_entry or error code 126: Index is corrupted upon DELETE with PAD_CHAR_TO_FULL_LENGTH"

This reverts commit 5a9e2b77 in 10.5,
so it produces an error on "bad" generated columns.

Note, 10.2, 10.3, 10.4 produce only warnings, for backward compatibility.

Cherry-pick the commits the mysql and some changes.
WL#4618 RBR: extended table metadata in the binary log

This patch extends Table Map Event. It appends some new fields for
more metadata. The new metadata includes:
- Signedness of Numberic Columns
- Character Set of Character Columns and Binary Columns
- Column Name
- String Value of SET Columns
- String Value of ENUM Columns
- Primary Key
- Character Set of SET Columns and ENUM Columns
- Geometry Type

Some of them are optional, the patch introduces a GLOBAL system
variable to control it. It is binlog_row_metadata.
- Scope:   GLOBAL
- Dynamic: Yes
- Type:    ENUM
- Values:  {NO_LOG, MINIMAL, FULL}
- Default: NO_LOG
  Only Signedness, character set and geometry type are logged if it is MINIMAL.
  Otherwise all of them are logged.

Also add a binlog_type_info() to field, So that we can have extract
relevant binlog info from field.

Null merge the MDEV-14383 fix; it affects 5.5 only.

Also added comments for trace_plan_prefix and the class Json_writer_temp_disable

Added:
      1) estimated_join_cardinality
      2) best_chosen_access_method for a table
      3) best_join_order

there was a SELECT/DELETE race

Files for PAGE_COMPRESSED tables that were created with
innodb_checksum_algorithm=full_crc32 store the value of
innodb_compression_algorithm at the time of the file creation.

The server-wide setting of innodb_compression_algorithm
may be changed after file creation. We must ignore any mismatch
when opening a data file, and for writes, we must use the
choice of algorithm that is stored in the file.

fil_space_t::is_flags_full_crc32_equal(): Ignore the
innodb_compression_algorithm but do compare innodb_page_size.

fil_space_t::is_flags_non_full_crc32_equal(): Ignore the
innodb_compression_algorithm.

The test mariabackup.encrypted_page_corruption was hard-wired
for innodb_checksum_algorithm=crc32. Enable a combination for
full_crc32 for the sake of completeness.

Re-enable some Galera tests that should have been enabled.

Add client_ed25519.so to debian/libmariadb3.install;
merge e47a143f correctly.

Remove a duplicated #include from wsrep_mysqld.cc.