lightning: specify collation when parquet value to string datum (#38391)

[ti-chi-bot]

This is an automated cherry-pick of #38391

What problem does this PR solve?

Issue Number: close #38351

Problem Summary:

What is changed and how it works?

For parquet parser, when setting a value into the string datum, use the "utf8mb4_bin" collation instead of an empty collation. This will make the string conversion logic not report errors, thus improving the performance.

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lance6716
• niubell

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[niubell]

LGTM

[lance6716]

/run-all-tests

[dsdashun]

/merge

[ti-chi-bot]

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

Commit hash: 143bdbe

[dsdashun]

/run-check_dev

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