expression: check NotNullFlag of columns when simplifying binary operations (#24049)

[ti-srebot]

cherry-pick #24049 to release-5.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24063

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---

What problem does this PR solve?

Issue Number: close #23891

Problem Summary:

Wrong result of queries.

What is changed and how it works?

What's Changed:

Check NotNullFlag in refineArgs before saying that the result of the expression is exceptional.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

N/A

Release note

• Fix wrong query result when column contains null values

[ti-srebot]

/run-all-tests

[ti-srebot]

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

[time-and-fate]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• time-and-fate

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[eurekaka]

/merge

[ti-chi-bot]

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

Commit hash: 54267568e928d164fddc9a7a39e7149cdf4b9284

[eurekaka]

/merge

[eurekaka]

/run-integration-copr-test

[eurekaka]

/merge

[zimulala]

/run-common-test

[ti-chi-bot]

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