Character set name is case sensitive in TiDB

[evancao77]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

I use mydumper from version 1. 0 dumper to version 2. 0. 8.for example, character sets are case-sensitive.

2. What did you expect to see?
   I can loader to 2.0.8

3. What did you see instead?
   dumper sql:
   create table test
   (id int)
   ENGINE=InnoDB DEFAULT CHARSET=UTF8 COLLATE=UTF8_BIN;

Can't recognize UTF8, if I change to utf8, it can be created

Is there a parameter that can be controlled case-sensitive

4. What version of TiDB are you using (tidb-server -V or run select tidb_version(); on TiDB)?
   1.0.8 to 2.0.8

[evancao77]

export json : convert("[{"airline_code":"5569","airline_name":"首都航空","airport_from":"HFE","airport_to":"HET","dt_flight":"20108","passenger_idcard":"3412241985********","passenger_idcard_type":"0","passenger_name":"张**","passenger_phone":"1315*"}]" using UTF8MB4)

I look at the UFT8MB4 of the default character set from the document.but.When using loader imports , It suggests that UTF8MB4 is not supported. I can change it to UTF8,. This is a bug?

[tiancaiamao]

PTAL @winkyao

[morgo]

Showing simplified testcase:

mysql57> create table test
    -> (id int)
    -> ENGINE=InnoDB DEFAULT CHARSET=UTF8 COLLATE=UTF8_BIN;
Query OK, 0 rows affected (0.09 sec)

Then in TiDB:

tidb> create table test
    -> (id int)
    -> ENGINE=InnoDB DEFAULT CHARSET=UTF8 COLLATE=UTF8_BIN;
ERROR 1115 (42000): Unknown character set: 'UTF8'

[evancao77]

export json : convert("[{"airline_code":"5569","airline_name":"首都航空","airport_from":"HFE","airport_to":"HET","dt_flight":"20108","passenger_idcard":"3412241985**","passenger_idcard_type":"0","passenger_name":"张**","passenger_phone":"1315*"}]" using UTF8MB4)

I look at the UFT8MB4 of the default character set from the document.but.When using loader imports , It

[tiancaiamao]

When using loader imports , It suggests that UTF8MB4 is not supported.

What't the error message of TiDB and the loader in the log? @evancao77

[winkyao]

@evancao77 The root cause of this is TiDB not change collation to lower case to compare. I will fix it soon.

[winkyao]

@morgo Below case can pass

mysql> create table test(id int) ENGINE=InnoDB DEFAULT CHARSET=UTF8 COLLATE=UTF8_BIN;
ERROR 1115 (42000): Unknown character set: 'UTF8'
mysql> create table test(id int) ENGINE=InnoDB DEFAULT CHARSET=UTF8 COLLATE=utf8_bin;
Query OK, 0 rows affected (0.01 sec)