planner: use TxnCtx.InfoSchema to prevent schema inconsistency (#49947)

[ti-chi-bot]

This is an automated cherry-pick of #49947

What problem does this PR solve?

Issue Number: ref #41622

close #49751

Problem Summary:

What changed and how does it work?

The result of sctx.GetInfoSchema().(infoschema.InfoSchema) is not stable if the caller side is not in a transaction && snapshot_ts is not set, it just get the latest InfoSchema:

tidb/pkg/session/session.go

Lines 4052 to 4074 in c20874e

	func (s *session) GetInfoSchema() sessionctx.InfoschemaMetaVersion {
	vars := s.GetSessionVars()
	var is infoschema.InfoSchema
	if snap, ok := vars.SnapshotInfoschema.(infoschema.InfoSchema); ok {
	logutil.BgLogger().Info("use snapshot schema", zap.Uint64("conn", vars.ConnectionID), zap.Int64("schemaVersion", snap.SchemaMetaVersion()))
	is = snap
	} else {
	vars.TxnCtxMu.Lock()
	if vars.TxnCtx != nil {
	if tmp, ok := vars.TxnCtx.InfoSchema.(infoschema.InfoSchema); ok {
	is = tmp
	}
	}
	vars.TxnCtxMu.Unlock()
	}
	if is == nil {
	is = domain.GetDomain(s).InfoSchema()
	}
	// Override the infoschema if the session has temporary table.
	return temptable.AttachLocalTemporaryTableInfoSchema(s, is)
	}

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.

planner: use TxnCtx.InfoSchema to prevent schema inconsistency

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.5@20c3e7d). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #49966   +/-   ##
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  Coverage               ?   72.0195%           
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  Files                  ?       1400           
  Lines                  ?     406587           
  Branches               ?          0           
================================================
  Hits                   ?     292822           
  Misses                 ?      94100           
  Partials               ?      19665           

Flag	Coverage Δ
unit	72.0195% <0.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.3104% <0.0000%> (?)

[elsa0520]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elsa0520, hawkingrei

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• OWNERS [hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-04 06:01:52.339084889 +0000 UTC m=+2323203.376311808: ☑️ agreed by hawkingrei.
• 2024-01-04 07:11:00.476377915 +0000 UTC m=+2327351.513604843: ☑️ agreed by elsa0520.

[hawkingrei]

/retest