[release-6.5] Update default import config

[breezewish]

What problem does this PR solve?

Issue Number: ref #7272

Problem Summary:

What is changed and how it works?

Update default import config.

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

Improve import performance when using default config

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CalvinNeo
• Lloyd-Pottiger

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[CalvinNeo]

lgtm

[breezewish]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: 39be988