planner: fix wrong PointGet / TableDual plan reused in plan cache (#23238)

[ti-srebot]

cherry-pick #23238 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24043

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---

What problem does this PR solve?

Issue Number: close #23187
close #23144
close #23304
close #23290

Problem Summary:

Planner cannot find a plan for a query while it indeed can.

What is changed and how it works?

What's Changed:

• if we prune paths in DeriveStats and only keep the TableDual / PointGet path, we mark this plan as not cacheable;
• in skylinePruning we can enable the early return now if we find a path with empty range;

How it Works:

These plans have strong dependency on the param values, i.e, if the values change, those plans may lead to wrong query results.

Related changes

N/A

Check List

Tests

• Unit test

Side effects

• Performance regression
  • This may prevent some plans which have TableDual / PointGet from being cached, while those TableDual / PointGet may have no relationship with param values at all. For example, plan for query prepare stmt from 'select * from t1, t2 where t1.a > 9 and t1.a < 0 and t2.a > ? and t1.b = t2.b' cannot be cached then, but it is safe actually.

Release note

• Fix wrong PointGet / TableDual plan reused in plan cache

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[time-and-fate]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• time-and-fate

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[eurekaka]

/merge

[ti-chi-bot]

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

Commit hash: 15e10c9