copr: don't resize binary opaque when the type flen is unspecified (#16617)

[ti-chi-bot]

This is an automated cherry-pick of #16617

What is changed and how it works?

Issue Number: Close #16616

What's Changed:

If the flen is unspecified (-1), don't resize the string to try to produce extra zero. ref pingcap/tidb#51586

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

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

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• breezewish
• tonyxuqqi

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[YangKeao]

/cc @breezewish @gengliqi

[YangKeao]

/run-all-tests

[breezewish]

/merge

[ti-chi-bot]

@breezewish: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 0719369

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

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[YangKeao]

/run-all-tests

[YangKeao]

/run-all-tests