lightning: let ignore columns be compatible with tidb backend (#27850)

[ti-srebot]

cherry-pick #27850 to release-5.3
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/30064

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

git push git@github.com:ti-srebot/tidb.git pr/30064:release-5.3-c68791566d55

---

What problem does this PR solve?

Let lightning config mydumper.ignore-columns be compatible with tidb backend.

Issue Number: ref #32591

Problem Summary:

What is changed and how it works?

Let the kv packend generated by encodeLoop contains the column names with ignore columns filtered instead of the raw column names.

Proposal: xxx

What's Changed:

How it Works:

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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• glorv
• kennytm

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[sleepymole]

/run-check_dev

[sleepymole]

[2021-11-25T02:54:11.317Z] PANIC: restore_test.go:1451: chunkRestoreSuite.TestEncodeLoopColumnsMismatch
[2021-11-25T02:54:11.317Z]
[2021-11-25T02:54:11.317Z] ... Panic: runtime error: index out of range [0] with length 0 (PC=0x1348FD8)

🤔

[glorv]

/run-check_dev

[glorv]

/run-check_dev

[sleepymole]

/run-check_dev

[glorv]

/merge

[ti-chi-bot]

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

Commit hash: 88a430f