*: add pool from TopNFromProto

[hawkingrei]

trafficstars

What problem does this PR solve?

Issue Number: close #46914

Problem Summary:

What is changed and how it works?

Check List

Tests

• [x] 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

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@hawkingrei: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
tiprow_fast_test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test tiprow_fast_test

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[ti-chi-bot[bot]]

PR needs rebase.

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[ti-chi-bot[bot]]

@hawkingrei: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/check_dev	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test check-dev
idc-jenkins-ci-tidb/build	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test build
idc-jenkins-ci-tidb/check_dev_2	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test unit-test
pull-integration-ddl-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-integration-ddl-test
pull-mysql-client-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-mysql-client-test
idc-jenkins-ci-tidb/mysql-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test mysql-test
pull-br-integration-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-br-integration-test
pull-lightning-integration-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-lightning-integration-test
pull-integration-e2e-test	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-integration-e2e-test
pull-integration-realcluster-test-next-gen	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-integration-realcluster-test-next-gen
pull-unit-test-next-gen	8a41112a61b945aee6ce300b601af363036ca481	link	true	/test pull-unit-test-next-gen

Full PR test history. Your PR dashboard.

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