*: fix a bug that update statement uses point get and update plan with different tblInfo (#54183)

[ti-chi-bot]

This is an automated cherry-pick of #54183

What problem does this PR solve?

Issue Number: close https://github.com/pingcap/tidb/issues/53634

Problem Summary:

Case

Init SQLs：

CREATE TABLE stock ( a int NOT NULL, b char(30) NOT NULL,  c int, d char(64), PRIMARY KEY(a,b)) ;
insert into stock values(1, 'a', 11, 'x'), (2, 'b', 22, 'y');
alter table stock add column cct_1 int default 10;
alter table stock modify cct_1 json;
alter table stock add column adc_1 smallint;

• Step1. using conn1 prepare statements:

    begin;
    SELECT a, c, d from stock where (a, b) IN ((?, ?),(?, ?)) FOR UPDATE;
    UPDATE stock SET c = ? WHERE a= ? AND b = 'a';
    UPDATE stock SET c = ?, d = 'z' WHERE a= ? AND b = 'b';
    commit;

run a statement: begin;

• Step2. using conn2 do DDL:

    alter table stock drop column cct_1;

• Step3. using conn1 When the DDL is in Write-Only state exec statements:

    SELECT a, c, d from stock where (a, b) IN ((?, ?),(?, ?)) FOR UPDATE;
    UPDATE stock SET c = ? WHERE a= ? AND b = 'a';
    UPDATE stock SET c = ?, d = 'z' WHERE a= ? AND b = 'b';
    commit;

• Step4. using conn1 Check the result select * from stock;

• Statement execution order table

conn1	conn2
step1. prepare stmts
step1. begin;
	step2. alter table stock drop column cct_1; (state public -> write-only)
step3. exec stmts	write-only
	step2. alter table stock drop column cct_1; (finish)
step4. select * from stock;

Conclusion

The update statement in step3 uses point get and update plan, but the tblInfo used by the two plans is inconsistent, resulting in incorrect data in real storage.

• After executing step3. select statement, the stock is locked in GetRelatedTableForMDL, so stmt.tbls[i].Meta().Revision != newTbl.Meta().Revision is false. It means schemaNotMatch is false. So we needn't to Preprocess. https://github.com/pingcap/tidb/blob/d5b89f8bccdf13cf664ba8bb65a87b7342676d49/pkg/planner/core/plan_cache.go#L114-L119

• Step3. update statement using tblName.TableInfo(get it when preparing statements, cct_1 is public) in newPointGetPlan. https://github.com/pingcap/tidb/blob/d5b89f8bccdf13cf664ba8bb65a87b7342676d49/pkg/planner/core/point_get_plan.go#L1317

• Step3. update statement using t gets from is.TableByID(tbl.ID)( cct_1 is write-only) https://github.com/pingcap/tidb/blob/d5b89f8bccdf13cf664ba8bb65a87b7342676d49/pkg/planner/core/point_get_plan.go#L1945-L1950

What changed and how does it work?

Add the Revision field comparison of tbl(get from txn infoschema) and newTbl to confirm whether reprocess is required.

Check List

Tests

• [x] 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.

Fix an issue where improper use of metadata locks in some scenarios could cause abnormal data to be written when using the plan cache.

[fzzf678]

/retest

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-08-29 04:17:54.571332515 +0000 UTC m=+1016669.705782621: :ballot_box_with_check: agreed by Defined2014.
• 2024-08-29 06:12:12.241129933 +0000 UTC m=+1023527.375580051: :ballot_box_with_check: agreed by qw4990.

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[fzzf678]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 53.96825% with 29 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-6.5@4ffd88c). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #54259   +/-   ##
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  Coverage               ?   73.6304%           
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  Files                  ?       1097           
  Lines                  ?     352812           
  Branches               ?          0           
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  Hits                   ?     259777           
  Misses                 ?      76330           
  Partials               ?      16705           

[Lloyd-Pottiger]

/cherry-pick release-6.5-20241009-v6.5.10