incorrect tableDual plan caused by range partition

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

CREATE TABLE `t5adc716d` (
  `col_38` mediumint(8) unsigned DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin
PARTITION BY RANGE (`col_38`)
(PARTITION `p0` VALUES LESS THAN (5086706),
 PARTITION `p1` VALUES LESS THAN (7268292),
 PARTITION `p2` VALUES LESS THAN (16545422));

desc select * from t5adc716d where col_38 BETWEEN -6895222 AND 3125507;

2. What did you expect to see? (Required)

TableScan

3. What did you see instead (Required)

mysql> desc select * from t5adc716d where col_38 BETWEEN -6895222 AND 3125507;
+-------------+---------+------+---------------+---------------+
| id          | estRows | task | access object | operator info |
+-------------+---------+------+---------------+---------------+
| TableDual_7 | 0.00    | root |               | rows:0        |
+-------------+---------+------+---------------+---------------+
1 row in set, 1 warning (0.00 sec)

4. What is your TiDB version? (Required)

ebe334f