expression: push down EXTRACT to TiFlash

[leiysky]

What problem does this PR solve?

Issue Number: close pingcap/tiflash#1401

Problem Summary:

What is changed and how it works?

What's Changed:

• Enable EXTRACT push down for TiFlash

How it Works:

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test

Release note

• Support EXTRACT function push down to TiFlash

[leiysky]

/run-all-tests

[leiysky]

/cc @ichn-hu

[leiysky]

/cc @LittleFall

[LittleFall]

/run-tics-test

[LittleFall]

/run-tics-test

[LittleFall]

/run-tics-test

[LittleFall]

/run-unit-test

[LittleFall]

/lgtm

[LittleFall]

/run-unit-test

[LittleFall]

/priority release-blocker

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• LittleFall
• lzmhhh123

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.

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

[leiysky]

/merge

[ti-chi-bot]

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

Commit hash: bbb8a78

[lzmhhh123]

/merge

[ti-chi-bot]

@leiysky: Your PR was out of date, I have automatically updated it for you.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