cherry pick PR#3283 about sending schemas in exchangeSender

[fzhedu]

This is an automated cherry-pick of #3318

What problem does this PR solve?

Issue Number: close #3146

Problem Summary:

What is changed and how it works?

Proposal: xxx

What's Changed:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch:

Check List

Tests

• Integration test

Side effects

Release note

None

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[REVIEW NOTIFICATION]

This pull request has been approved by:

• fuzhe1989
• windtalker

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[windtalker]

Don't need to update tipb?

[fzhedu]

Don't need to update tipb?

Tue Jan 18 17:59:24 2022 +0800, the HEAD of tipb is newer.

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All committers have signed the CLA.

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[windtalker]

LGTM

[fzhedu]

/merge

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

Commit hash: dfc8922

[fzhedu]

/merge

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[fzhedu]

/merge

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[fzhedu]

/merge

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[fzhedu]

/rebuild

[fzhedu]

/run-integration-tests

[fzhedu]

@VelocityLight PTAL approve

[fzhedu]

/merge

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[fzhedu]

/merge

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@fzhedu: It seems you want to merge this PR, I will help you trigger all the tests:

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[fzhedu]

/merge

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[fzhedu]

/run-all-tests

[zanmato1984]

LGTM

[zanmato1984]

/merge

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