ddl: do not unset involving schema on EntryTooLarge error (#51963)

[ti-chi-bot]

This is an automated cherry-pick of #51963

What problem does this PR solve?

Issue Number: close #51962

Problem Summary:

tidb/pkg/ddl/ddl_worker.go

Lines 544 to 565 in 274d5e2

	func (w *worker) handleUpdateJobError(t *meta.Meta, job *model.Job, err error) error {
	if err == nil {
	return nil
	}
	if kv.ErrEntryTooLarge.Equal(err) {
	w.jobLogger(job).Warn("update DDL job failed", zap.String("job", job.String()), zap.Error(err))
	w.sess.Rollback()
	err1 := w.sess.Begin()
	if err1 != nil {
	return errors.Trace(err1)
	}
	// Reduce this txn entry size.
	job.BinlogInfo.Clean()
	job.InvolvingSchemaInfo = nil
	job.Error = toTError(err)
	job.ErrorCount++
	job.SchemaState = model.StateNone
	job.State = model.JobStateCancelled
	err = w.finishDDLJob(t, job)
	}
	return errors.Trace(err)
	}

We should not set job.InvolvingSchemaInfo to nil even if this txn size is too large, because we need this field to "unblock" other DDLs that change the same schemas/tables.

What changed and how does it work?

See 'Files Changed'.

Check List

Tests

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

[codecov]

Codecov Report

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Additional details and impacted files

@@               Coverage Diff                @@
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  Hits                   ?     279325           
  Misses                 ?      83013           
  Partials               ?      17789           

[zimulala]

Why remove the TestDDLJobErrEntrySizeTooLarge test? link:https://github.com/pingcap/tidb/pull/51963/files#diff-7c1290a77f6eb82b5792565cfc6619c8b3ceed2fb7002a3cce0384a8b65d8b36R1067

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ywqzzy, zimulala

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-16 03:31:08.382630708 +0000 UTC m=+308887.493677149: ☑️ agreed by ywqzzy.
• 2024-04-16 04:22:42.024958381 +0000 UTC m=+311981.136004831: ☑️ agreed by zimulala.