executor: make IndexMergeReader support reading partition table directly

[qw4990]

What problem does this PR solve?

Issue Number: close #24160

Problem Summary: executor: make IndexMergeReader support reading partition table directly

What is changed and how it works?

This PR makes IndexMergeReader support reading partition tables directly using the similar way with #24197.

The picture below shows how we implement this feature:

1. build KVReq for each partition table separately;
2. let IndexWorker and PKWorker handle these KVReqs one by one;
3. delivery partition information to MergeWorker and TableWorker as well;
   

Check List

Tests

• Unit test

Release note

• executor: make IndexMergeReader support reading partition table directly

[qw4990]

Please help us review this PR at your convenience, @lysu @tiancaiamao
Very appreciate your reviews 🧎 !

[qw4990]

/run-all-tests

[tiancaiamao]

/LGTM

[qw4990]

Thanks, @tiancaiamao , and PTAL at your convenience @lysu

[lysu]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lysu
• tiancaiamao

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[lysu]

/merge

[ti-chi-bot]

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

Commit hash: 1c08596

[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 31238d8

[qw4990]

/run-all-tests

[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 8b0799b

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Please follow PR Title Format:

• pkg [, pkg2, pkg3]: what's changed

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[qw4990]

/run-all-tests

[ti-chi-bot]

/run-all-tests

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[ti-chi-bot]

/run-all-tests

This bot automatically retries jobs that failed on can merge PRs (send feedback to hi-rustin).

Silence the bot with the /merge cancel comment for consistent failures.

[ti-chi-bot]

/run-all-tests

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Silence the bot with the /merge cancel comment for consistent failures.

[qw4990]

/merge

[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: 777887b

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[qw4990]

/run-unit-test