rename tables causes duplicated row in information_schema.columns

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table t1(a int);
create table t2(a int);
create table t3(a int);
create database test1;
rename table test.t1 to test1.t1, test.t2 to test1.t2, test.t3 to test1.t3;
select column_name from information_schema.columns where table_name = 't1';

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

+-------------+
| column_name |
+-------------+
| a           |
+-------------+
1 row in set (0.00 sec)

3. What did you see instead (Required)

+-------------+
| column_name |
+-------------+
| a           |
| a           |
+-------------+

4. What is your TiDB version? (Required)

master

[jiyfhust]

/assign