Wrong CREATE_TIME for partitioned table

information_schema.partitions table contains has wrong CREATE_TIME and UPDATE_TIME for partitioned tables.

How to repeat.

CREATE TABLE t1 (
id INT,
year_col INT
)
PARTITION BY RANGE (year_col) (
PARTITION p0 VALUES LESS THAN (1991),
PARTITION p1 VALUES LESS THAN (1995),
PARTITION p2 VALUES LESS THAN (1999)
);
select TABLE_SCHEMA, TABLE_NAME, PARTITION_NAME, CREATE_TIME, UPDATE_TIME from information_schema.partitions where table_schema='test';
TABLE_SCHEMA TABLE_NAME PARTITION_NAME CREATE_TIME UPDATE_TIME
test t1 p0 2017-11-06 23:11:28 NULL
test t1 p1 2017-11-06 23:11:28 NULL
test t1 p2 2017-11-06 23:11:28 NULL
ALTER TABLE t1 ADD PARTITION (PARTITION p3 VALUES LESS THAN (2002));
select TABLE_SCHEMA, TABLE_NAME, PARTITION_NAME, CREATE_TIME, UPDATE_TIME from information_schema.partitions where table_schema='test';
TABLE_SCHEMA TABLE_NAME PARTITION_NAME CREATE_TIME UPDATE_TIME
test t1 p0 2017-11-06 23:11:39 NULL
test t1 p1 2017-11-06 23:11:39 NULL
test t1 p2 2017-11-06 23:11:39 NULL
test t1 p3 2017-11-06 23:11:39 NULL

You see what CREATE_TIME updated for all partitions when I added only one.

This can be result of bad fix for https://bugs.mysql.com/bug.php?id=69990

Suggested fix: display time when each of partitions was created