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

[ti-chi-bot]

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@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	14ef1ce	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev_2	14ef1ce	link	true	/test check-dev2
idc-jenkins-ci-tidb/check_dev	14ef1ce	link	true	/test check-dev
idc-jenkins-ci-tidb/build	14ef1ce	link	true	/test build
idc-jenkins-ci-tidb/mysql-test	14ef1ce	link	true	/test mysql-test

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