`information_schema.tables` return wrong results with `count(*)`

[joechenrh]

Bug Report

Please answer these questions before submitting your issue. Thanks!

Queries for infoschema tables still have some case-sensitivity related problems.

1. Minimal reproduce step (Required)

create database test1;
create table test1.Table1;
select count(*) from information_schema.tables where upper(table_name) = "TABLE1";

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

+----------+
| count(*) |
+----------+
|        1 |
+----------+

3. What did you see instead (Required)

+----------+
| count(*) |
+----------+
|        0 |
+----------+

4. What is your TiDB version? (Required)

[joechenrh]

/severity major