planner: distinguish the source of join hint information (#41440)

[ti-chi-bot]

This is an automated cherry-pick of #41440

What problem does this PR solve?

Issue Number: ref #36600

Problem Summary:
distinguish the source of join hint information

What is changed and how it works?

1. add the variable "tidb_opt_advanced_join_hint"
2. When we try to build the join node in the plan-builder phase, we keep the hint information from the join's children. Not merge them all to the join node. Because, in the join reorder phase, we will split the join node and the join hint information will be lost.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, qw4990

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-28 04:41:31.487291379 +0000 UTC m=+502234.081822366: ☑️ agreed by qw4990.
• 2023-07-28 05:07:46.462488535 +0000 UTC m=+503809.057019523: ☑️ agreed by hawkingrei.

[qw4990]

/test build

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/test build

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@65f6531). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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[qw4990]

/test unit-test

[tiprow]

@qw4990: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.