executor: add new format specifier(%# %@ %.) for str_to_date expression (#22790)

[ti-srebot]

cherry-pick #22790 to release-4.0
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/22812

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

git push git@github.com:ti-srebot/tidb.git pr/22812:release-4.0-a3a4a6c4da7e

---

close #22530

What's Changed: add three function to parse

1. %#: skip numbers
2. %.: skip punct
3. %@: skip alpha

How it Works: If got %# in format specifier, iterate input string and skip all number. Same for the other two.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

• Performance regression: No perfmance regression
• Breaking backward compatibility: No compatibility issue

Release note

• add three format specifier for str_to_date expression

[ti-srebot]

/run-all-tests

[ti-srebot]

@guo-shaoge you're already a collaborator in bot's repo.

[XuHuaiyu]

LGTM

[AilinKid]

LGTM

[AilinKid]

/merge

[ti-srebot]

Sorry @AilinKid, this branch's release version is in progress, please contact zhouqiang-cl,shuke987,jebter,you06 for more details.

[guo-shaoge]

/run-all-tests

[XuHuaiyu]

/merge

[ti-chi-bot]

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

Commit hash: 109fef2

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@ti-srebot: Your PR was out of date, I have automatically updated it for you.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