In particular:
* @@debug
deprecated since 5.5.37
* sr_YU locale
deprecated since 10.0.11
* "engine_condition_pushdown" in the @@optimizer_switch
deprecated since 10.1.1
* @@date_format, @@datetime_format, @@time_format, @@max_tmp_tables
deprecated since 10.1.2
* @@wsrep_causal_reads
deprecated since 10.1.3
* "parser" in mroonga table comment
deprecated since 10.2.11
With session tracking on the tx_isolation of importance to
connector frameworks, its important that tracking of tx_isolation
does get informed if a user `set session transaction_isolation=X`
as the alias for tx_isolation.
Rather than just implement this for one variable alias, it
is implemented for all aliases.
To assist with this the key hash of session_tracker is now made up of
the offset, not the sys_var pointer.
The impacts of aliases are:
- If track one variable, its alias changes, you get a tracking
change on the variable you are monitoring.
- If you track two aliased variables of each other, changing
a variable will have a tracking events for only one of them.
Aliases of Sys_var_bit are not implemented, because we don't
have them, so would've been no way to verify that the new code works.
Post-Review edits by Sergei Golubchik <serg@mariadb.com>
