Fix test cases to remove hardcoded expected number for 'handler_next_read'
status variable. Apparently, number of rows in I_S.routines depends on
whether or not 'sys' schema is loaded, and this depends on whether or not
perfschema is compiled in.

- Cosmetic fixes

Reviewer:Brandon Nesterenko <brandon.nesterenko@mariadb.com>

- Add `replicate_rewrite_db` status variable, that may accept comma
separated key-value pairs.
- Note that option `OPT_REPLICATE_REWRITE_DB` already existed in `mysqld.h`
  from this commit 23d8586d

Reviewer:Brandon Nesterenko <brandon.nesterenko@mariadb.com>

The mysqld_multi script template used @datadir@ as default log
destination, this is not the MariaDB datadir in this context though
but rather the -- typically write-only -- /share dir.

The correct placeholder to use here is @localstatedir@ which gets
replaced with the actual MariaDB datadir
Co-authored-by: Hartmut Holzgraefe <hartmut@php.net>

Increasing the data type from char(32) to char(64) for
the following system columns:

- mysql.event.collation_connection
- mysql.event.db_collation
- mysql.proc.collation_connection
- mysql.proc.db_collation

This change was forgotten during MDEV-27009.

Also fixing the comment "Start/End of 10.9 tests" in ctype_utf8_uca.test
to "Start/End of 10.10 tests", as MDEV-27009 was actually
released in 10.10.

For queries like
    "SELECT * FROM INFORMATION_SCHEMA.PARAMETERS
      WHERE SPECIFIC_NAME='proc_name'"
and
    "SELECT * FROM INFORMATION_SCHEMA.ROUTINES
      WHERE ROUTINE_NAME='proc_name'"
there is a possibility to avoid loading of the stored procedure code
and parsing it to retrieve parameters.
If the name of the procedure/function is specified explicitly then
it is possible to filter out routines that do not match at
an early stage.

WITH_EMBEDDED_SERVER compiles the SQL parsers separately.
Thanks to Vladislav Vaintroub for helping with this.

Fixes up commit e05ab0cf

SELECT FROM JSON_TABLE

Analysis: When fix_fields_if_needed() is called, it doesnt check if operands
are valid because check_cols() is not called. So it doesn't error out and
eventually crashes.
Fix: Use fix_fields_if_needed_for_scalar() instead of
fix_fields_if_needed(). It filters the scalar and returns the error if
it occurs.

Queries to INFORMATION_SCHEMA.PARAMETERS and ROUTINES tables are always
performed using full index scan of the mysql.proc primary key
on fields (`db`,`name`,`type`). This can be done in a much more effective
way if `db` and `name` field values can be derived from the WHERE statement,
like here:
  SELECT * FROM INFORMATION_SCHEMA.PARAMETERS
    WHERE SPECIFIC_SCHEMA = 'test' AND SPECIFIC_NAME = 'my_func'
or here:
  SELECT * FROM information_schema.ROUTINES
    WHERE ROUTINE_SCHEMA='test' AND ROUTINE_NAME='my_func'.

In such cases index range scan may be employed instead of full index
scan. This commit makes the server retrieve lookup field values from
the SQL statement and perform index range scan instead of full index
scan if possible.