planner: Point get plan will cause wrong result set

[crazycs520]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Related issue: #21123

create table t (id bit(64) primary key);
insert into t values (48);

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

test> select * from t where id in ('0');
+----+
| id |
+----+
0 rows in set

3. What did you see instead (Required)

test> select * from t where id  in ('0');
+----------+
| id       |
+----------+
| 0 |
+----------+
1 row in set. 

4. What is your TiDB version? (Required)

test> select tidb_version();
+-------------------------------------------------------------------+
| tidb_version()                                                    |
+-------------------------------------------------------------------+
| Release Version: v4.0.0-beta.2-1609-gb085cad80                    |
| Edition: Community                                                |
| Git Commit Hash: b085cad80c3196beb470718d38594a161be3bae8         |
| Git Branch: master                                                |
| UTC Build Time: 2020-11-23 06:53:25                               |
| GoVersion: go1.14.4                                               |
| Race Enabled: false                                               |
| TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306 |
| Check Table Before Drop: false                                    |
+-------------------------------------------------------------------

[ti-srebot]

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