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Functionality added or changed:
KILL statement now takes CONNECTION and QUERY
variants. The first is the same as KILL with no modifier (it
kills a given connection thread). The second kills only the statement
currently being executed by the connection.
TIMESTAMPADD() and TIMESTAMPDIFF() functions.
WEEK and QUARTER values as INTERVAL arguments
for DATE_ADD() and DATE_SUB() functions.
SQL_MODE, SQL_AUTO_IS_NULL, FOREIGN_KEY_CHECKS
(that one was already replicated since 4.0.14 but here it's done more
efficiently: takes less space in the binary logs), UNIQUE_CHECKS.
Other variables (like character sets, SQL_SELECT_LIMIT...) will be
replicated in next 5.0.x releases.
Merge Index optimization for OR clauses.
See section 7.2.5 How MySQL Optimizes OR Clauses.
SELECT INTO list_of_vars, which can be of mixed,
that is, global and local type.
See section 18.1.6.3 SELECT ... INTO Statement.
Bugs fixed: