drainer: if all DML is filtered, return true ignore

[lance6716]

What problem does this PR solve?

Issue Number: close #1317

What is changed and how it works?

don't append to muts if the whole transaction is filtered, so that ignore is true

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to update the tidb-ansible repository
• Need to be included in the release note

Release note

If the whole transaction is filtered, release the memory

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[GMHDBJD]

LGTM

[ti-chi-bot]

@GMHDBJD: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

LGTM

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[wuhuizuo]

Please approve it after the PR merged.

[lance6716]

/hold

[lance6716]

/retest

[lance6716]

/run-unit-test

[lance6716]

/run-all-tests

[wuhuizuo]

/unhold

The PR is merged.

[lance6716]

/run-unit-test

[lance6716]

/run-integration-test

[kennytm]

unit test is still failing

[2024-09-06T08:54:54.645Z] FAIL: syncer_test.go:35: syncerSuite.TestFilterTable

[2024-09-06T08:54:54.645Z] 

[2024-09-06T08:54:54.645Z] syncer_test.go:61:

[2024-09-06T08:54:54.645Z]     c.Assert(ignore, check.IsFalse)

[2024-09-06T08:54:54.645Z] ... obtained bool = true

[GMHDBJD]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, GMHDBJD

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-09 03:27:45.755542744 +0000 UTC m=+240535.495966709: ☑️ agreed by D3Hunter.
• 2024-09-09 05:30:41.538357089 +0000 UTC m=+247911.278781028: ☑️ agreed by GMHDBJD.