Invalid TABLESAMPLE: plan not supported

[tangenta]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

drop table if exists t;
create table t (a decimal(62,2) not null, key idx (a), primary key (a) clustered);
select a from t tablesample regions() order by a;

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

No error.

3. What did you see instead (Required)

Invalid TABLESAMPLE: plan not supported

4. What is your TiDB version? (Required)

329a980