Index join returns error when join key is enum/set

[SunRunAway]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

drop table if exists i;
drop table if exists p;
drop table if exists t;
CREATE TABLE `p` (
    `type` enum('HOST_PORT') NOT NULL,
    UNIQUE KEY (`type`)
) ;

CREATE TABLE `i` (
  `objectType` varchar(64) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

insert into i values ('SWITCH');

create table t like i;
insert into t values ('HOST_PORT');
insert into t select * from t;
insert into t select * from t;
insert into t select * from t;
insert into t select * from t;
insert into t select * from t;
insert into t select * from t;

insert into i select * from t;

insert into p values('HOST_PORT');
select /*+ INL_HASH_JOIN(p) */ * from i, p where i.objectType = p.type;

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

select /*+ INL_HASH_JOIN(p) */ * from i, p where i.objectType = p.type;
...
65536 rows in set (0.05 sec)

3. What did you see instead (Required)

select /*+ INL_HASH_JOIN(p) */ * from i, p where i.objectType = p.type;
ERROR 1265 (01000): Data truncated for column '%s' at row %d

And panic occurs in the log

[2020/08/17 15:47:32.075 +08:00] [ERROR] [misc.go:91] ["panic in the recoverable goroutine"] [r="\"invalid memory address or nil pointer dereference\""] ["stack trace"="github.com/pingcap/tidb/util.WithRecovery.func1\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/util/misc.go:93\nruntime.gopanic\n\t/usr/local/Cellar/[email protected]/1.13.9/libexec/src/runtime/panic.go:679\nruntime.panicmem\n\t/usr/local/Cellar/[email protected]/1.13.9/libexec/src/runtime/panic.go:199\nruntime.sigpanic\n\t/usr/local/Cellar/[email protected]/1.13.9/libexec/src/runtime/signal_unix.go:394\ngithub.jparrowsec.cn/pingcap/tidb/util/chunk.(*iterator4List).Begin\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/util/chunk/iterator.go:190\ngithub.jparrowsec.cn/pingcap/tidb/util/chunk.(*iterator4List).Begin\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/util/chunk/iterator.go:190\ngithub.jparrowsec.cn/pingcap/tidb/executor.(*indexHashJoinInnerWorker).doJoinUnordered\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/executor/index_lookup_hash_join.go:575\ngithub.jparrowsec.cn/pingcap/tidb/executor.(*indexHashJoinInnerWorker).handleTask\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/executor/index_lookup_hash_join.go:567\ngithub.jparrowsec.cn/pingcap/tidb/executor.(*indexHashJoinInnerWorker).run\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/executor/index_lookup_hash_join.go:459\ngithub.jparrowsec.cn/pingcap/tidb/executor.(*IndexNestedLoopHashJoin).startWorkers.func2\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/executor/index_lookup_hash_join.go:185\ngithub.jparrowsec.cn/pingcap/tidb/util.WithRecovery\n\t/Users/sunrunaway/Code/gopath/src/github.com/pingcap/tidb/util/misc.go:96"]

4. What is your TiDB version? (Required)

v4.0.4, master