executor: fix show create table display mistake

[zhexuany]

Before:

CREATE TABLE `t` (
 `id` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
PARTITION BY RANGE ( `id` ) (
 PARTITION p0 VALUES LESS THAN 6,
 PARTITION p1 VALUES LESS THAN 11,
 PARTITION p2 VALUES LESS THAN 16,
 PARTITION p3 VALUES LESS THAN 21
)

After:

CREATE TABLE `t` (
 `id` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
PARTITION BY RANGE ( `id` ) (
 PARTITION p0 VALUES LESS THAN (6),
 PARTITION p1 VALUES LESS THAN (11),
 PARTITION p2 VALUES LESS THAN (16),
 PARTITION p3 VALUES LESS THAN (21)
)

[zz-jason]

LGTM

[XuHuaiyu]

LGTM

[XuHuaiyu]

/run-all-tests