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Functionality added or changed:
OPTIMIZE TABLE will for MyISAM tables treat all NULL
values as different when calculating cardinality. This helps in
optimizing joins between tables where one of the tables has a lot of
NULL values in a indexed column:
SELECT * from t1,t2 where t1.a=t2.key_with_a_lot_of_null; |
FORCE INDEX (key_list). This acts likes
USE INDEX (key_list) but with the addition that a table scan is
assumed to be VERY expensive. One bad thing with this is that it makes
FORCE a reserved word.
Bugs fixed:
LOAD DATA INFILE statement that
caused log rotation.