panic when admin check table

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

set global tidb_enable_global_index=1;
create table t ( col_1 json ,col_2 tinyint  unsigned not null default 57 , key idx_1 ( col_2 ,(cast(col_1 as CHAR(64) array)) ) ,unique key idx_2 ( (cast(col_1 as CHAR(64) array)) ) global ,primary key  ( col_2 )  /*T![clustered_index] clustered */ ) charset utf8 collate utf8_general_ci partition by hash ( col_2 ) partitions 5;

alter table t rename index idx_1 to idx_1_1;

admin check table t;

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

No panic

3. What did you see instead (Required)

mysql> admin check table t;
ERROR 1105 (HY000): runtime error: index out of range [1] with length 1

4. What is your TiDB version? (Required)

master

[Defined2014]

It seems that it has nothing to do with the global index, and the following SQL will also panic.

CREATE TABLE `t1` (
  `col_1` json DEFAULT NULL,
  `col_2` tinyint(3) unsigned NOT NULL DEFAULT '57',
  PRIMARY KEY (`col_2`) /*T![clustered_index] CLUSTERED */,
  KEY `idx_1` (`col_2`,(cast(`col_1` as char(64) array))),
  UNIQUE KEY `idx_2` ((cast(`col_1` as char(64) array)))
);
alter table t1 rename index idx_1 to idx_1_1;
admin check  table t1;