planner: fix tablesample 'order by' clause from partitioned table (#27383)

[ti-srebot]

cherry-pick #27383 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/27412

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git push git@github.com:ti-srebot/tidb.git pr/27412:release-5.0-086a63f47134

---

What problem does this PR solve?

Issue Number: close #27349

Problem Summary:

drop table if exists t;
create table t (a int, b int, unique key idx(a)) partition by range (a) (
    partition p0 values less than (0),
    partition p1 values less than (10),
    partition p2 values less than (30),
    partition p3 values less than (maxvalue)
);
insert into t values (2, 2), (31, 31), (12, 12);
select _tidb_rowid from t tablesample regions() order by _tidb_rowid;

+-------------+
| _tidb_rowid |
+-------------+
|           1 |
|           3 |
|           2 |
+-------------+
3 rows in set (0.01 sec)

The result is not sorted by _tidb_rowid. For details, see #27349 (comment).

What is changed and how it works?

What's Changed:

Prevent generating a keep-ordered PhysicalTableSample plan for partitioned tables.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Fix an issue that the `TABLESAMPLE` query result from partitioned tables is not sorted as expected.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bb7133
• qw4990

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[ti-srebot]

/run-all-tests

[ti-srebot]

@tangenta you're already a collaborator in bot's repo.

[bb7133]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: e8bd13e

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