Failed to create index with distribute framework after import data via lightning

[GMHDBJD]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

 gmhdbjd@gmhdbjd  ~/code/tidb/bin   master  ./tidb-lightning -c cfg.toml
Verbose debug logs will be written to tidb-lightning.log

tidb lightning exit successfully
 gmhdbjd@gmhdbjd  ~/code/tidb/bin   master  mysql -uroot -h127.0.0.1 -P4000
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 17
Server version: 5.7.25-TiDB-v7.3.0-alpha TiDB Server (Apache License 2.0) Community Edition, MySQL 8.0 compatible

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> set global tidb_enable_dist_task=1;
Query OK, 0 rows affected (0.03 sec)

mysql> use db;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from tb;
+------+------+
| id   | msg  |
+------+------+
|    1 | 1    |
+------+------+
1 row in set (0.00 sec)

mysql> show config where type = 'tikv' && name = 'storage.engine';
+------+-----------------+----------------+---------+
| Type | Instance        | Name           | Value   |
+------+-----------------+----------------+---------+
| tikv | 127.0.0.1:20160 | storage.engine | raft-kv |
+------+-----------------+----------------+---------+
1 row in set (0.01 sec)

mysql> create index idx on tb(id);

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

create index succeed

3. What did you see instead (Required)

[2023/07/28 15:33:51.366 +08:00] [WARN] [dispatcher.go:379] ["gen dist-plan failed"] [error="PD returned no region, startKey: \"74800000000000006C5F728000000000000001\", endKey: \"74800000000000006C5F728000000000000001\", limit: 128"]

4. What is your TiDB version? (Required)

master

[GMHDBJD]

Errors will only occur when there is only one row

[jiyfhust]

/assign

[jiyfhust]

It seems:
https://github.com/pingcap/tidb/blob/06ea55d0c5b90c1451690951856e595d2290a55c/ddl/reorg.go#L736C30-L736C30
because there is only one record，the return value start is same with end.As The error message shows:
startKey: "74800000000000006C5F728000000000000001"
endKey: "74800000000000006C5F728000000000000001"

The pd client api will get regions by range [startKey, endKey), not [startKey, endKey]，
if the range of the region which has the record start with the same value with startKey,
then it will return no region.
https://github.com/tikv/pd/blob/fe52361cf48a7f5ed8c69bcd02db77e25162f207/pkg/core/region.go#L1506C3-L1506C3

then error occurrs.