use_index_merge return wrong result

[ChenPeng2013]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

use test;
drop table if exists t;
CREATE TABLE `t` (
  `a` int(11) DEFAULT NULL,
  `b` int(11) DEFAULT NULL,
  `c` int(11) DEFAULT NULL,
  `d` int(11) DEFAULT NULL,
  `e` int(11) DEFAULT NULL,
  KEY `a` (`a`),
  KEY `b` (`b`),
  KEY `c` (`c`),
  KEY `d` (`d`),
  KEY `c_2` (`c`,`d`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

insert into t values(10, 1,1,1,1);
select /*+ use_index_merge(t) */ * from t where t.a=10 or (t.b=10 and t.e=10);

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

mysql> select /*+ use_index_merge(t) */ * from t where t.a=10 or (t.b=10 and t.e=10);
+------+------+------+------+------+
| a    | b    | c    | d    | e    |
+------+------+------+------+------+
|   10 |    1 |    1 |    1 |    1 |
+------+------+------+------+------+
1 row in set, 1 warning (0.01 sec)

3. What did you see instead (Required)

mysql> select /*+ use_index_merge(t) */ * from t where t.a=10 or (t.b=10 and t.e=10);
Empty set (0.00 sec)

4. What is your TiDB version? (Required)

master v4.0.0-beta.2-2274-gdb62e341f
release-5.0-rc v5.0.0-rc-21-g8304d661f
release-4.0 v4.0.11-10-g38f9bdd81

[eurekaka]

QA verified that the problem was introduced in 4.0.9.

[wjhuang2016]

Introduced by #20425

[ti-srebot]

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Bug

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1. Root Cause Analysis (RCA) (optional)

2. Symptom (optional)

3. All Trigger Conditions (optional)

4. Workaround (optional)

5. Affected versions

[v4.0.9:v4.0.11],[v5.0.0-rc]

6. Fixed versions

master