dxf: get task from both mysql.tidb_global_task and mysql.tidb_global_task_history (#57063)

[ti-chi-bot]

This is an automated cherry-pick of #57063

What problem does this PR solve?

Issue Number: close #56942

Problem Summary:
#56942 (comment)

What changed and how does it work?

Get the task from mysql.tidb_global_task and mysql.tidb_global_task_history in updateDistTaskRowCount, and sum up the row count from both tidb_background_subtask and tidb_background_subtask_history table.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

1. Use sysbench create 100 tables with 10000 rows each.
2. After all ddl jobs finished, check the ddl job row count, the row_count should all be 10000:

mysql> admin show ddl jobs 100 where row_count != 10000;
Empty set (0.03 sec)

• No need to test

  • I checked and no code files have been changed.

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

[ti-chi-bot]

@fzzf678 This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[fzzf678]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.1@61d7f3c). Learn more about missing BASE report.

Additional details and impacted files

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Flag	Coverage Δ
unit	71.2847% <100.0000%> (?)

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Components	Coverage Δ
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parser	∅ <0.0000%> (?)
br	41.4147% <0.0000%> (?)

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-02 01:47:33.535493116 +0000 UTC m=+1445906.258672098: ☑️ agreed by fzzf678.
• 2025-07-02 02:43:22.301374385 +0000 UTC m=+1449255.024553367: ☑️ agreed by D3Hunter.

[fzzf678]

/unhold

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, fzzf678, tangenta

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Needs approval from an approver in each of these files:

• pkg/ddl/OWNERS [tangenta]
• pkg/disttask/OWNERS [D3Hunter,tangenta]

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