statistics: skip reading mysql.stats_histograms if cached stats is up-to-date (#24175)

[ti-srebot]

cherry-pick #24175 to release-5.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24317

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/24317:release-5.0-734084fa2bf2

---

What problem does this PR solve?

Issue Number: close #24096

Problem Summary:

There is no write in the cluster, while mysql.stats_histograms is repeatedly read.

What is changed and how it works?

What's Changed:

Skip reading mysql.stats_histograms if the cached stats is up-to-date.

Related changes

N/A

Check List

Tests

• Unit test

Side effects

N/A

Release note

• Skip reading mysql.stats_histograms if cached stats is up-to-date

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[crazycs520]

/lgtm

[ti-chi-bot]

@crazycs520: /lgtm is only allowed for the reviewers in list.

In response to this:

/lgtm

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 ti-community-infra/tichi repository.

[time-and-fate]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• time-and-fate
• winoros

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by writing /lgtm in a comment.
Reviewer can cancel approval by writing /lgtm cancel in a comment.

[eurekaka]

/merge

[ti-chi-bot]

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

Commit hash: e30bebe6a74dc1648f5957ddd118958ec293c537

[eurekaka]

/merge

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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 ti-community-infra/tichi repository.