planner, expression: avoid exprs with side effects in column pruning and agg pushdown (#27370)

[ti-srebot]

cherry-pick #27370 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/27638

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git push git@github.com:ti-srebot/tidb.git pr/27638:release-5.1-8dcebd12395d

---

What problem does this PR solve?

Issue Number: close #27106

Problem Summary:

What is changed and how it works?

1. Do not prune expressions with side effects in column pruning. (planner/core/rule_column_pruning.go)
2. Do not push down agg across projection if there are expressions with side effects in projection. (planner/core/rule_aggregation_push_down.go)

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:

• Reminiscent
• qw4990

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[ti-srebot]

/run-all-tests

[ti-srebot]

@time-and-fate you're already a collaborator in bot's repo.

[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 20a8b66

[time-and-fate]

/run-check_dev

[qw4990]

/merge

[qw4990]

/merge

[qw4990]

/merge

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