executor: fix a bug that can not insert null into a not null column in the empty SQL mode (#21237)

[ti-srebot]

cherry-pick #21237 to release-4.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/27832

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git push git@github.com:ti-srebot/tidb.git pr/27832:release-4.0-c3e54962d124

---

Signed-off-by: wjhuang2016 huangwenjun1997@gmail.com

What problem does this PR solve?

Issue Number: close #11648

Problem Summary:

What is changed and how it works?

Set BadNullAsWarning to True if not StrictSQLMode.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

Release note

• fix a bug that can not insert null into a not null column in the empty SQL mode

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• jackysp
• wjhuang2016

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[ti-chi-bot]

@ti-srebot: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[ti-srebot]

/run-all-tests

[ti-srebot]

@wjhuang2016 you're already a collaborator in bot's repo.

[jackysp]

LGTM

[jackysp]

LGTM

[wjhuang2016]

/merge

[ti-chi-bot]

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

Commit hash: 780cdca

[tiancaiamao]

/merge

[tiancaiamao]

/merge

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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