lightning: support null value for auto-incr column on local backend (#34552)

[ti-srebot]

cherry-pick #34552 to release-6.0
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/34595

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

git push [email protected]:ti-srebot/tidb.git pr/34595:release-6.0-b824e351b96d

---

What problem does this PR solve?

Issue Number: close #34208

Problem Summary:

What is changed and how it works?

When encoding the SQL into a TiDB KV for importing, if the value is NULL in a 'not-null' column, go on further processing on special column types rather than convert those NULL values into zero values directly

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-srebot]

@dsdashun please accept the invitation then you can push to the cherry-pick pull requests. Comment with /cherry-pick-invite if the invitation is expired.
https://github.com/ti-srebot/tidb/invitations

[dsdashun]

/run-integration-br-test

[D3Hunter]

not sure whether we should cp into 6.0 branch for pr on master.

for dm, it's not cp

[xhebox]

closed for DMR version