DDL: Use Column Name Instead of Offset to Find the common handle cluster index (#5166)

[ti-chi-bot]

This is an automated cherry-pick of #5166

What problem does this PR solve?

Issue Number: close #5154

Problem Summary:

What is changed and how it works?

in decodingSchemaSnapshot, we use column name instead of offset to find cluster index id of the common handle. Because in tiflash, we don't update the indexinfo of table_info except rename ddl action. Thus, the offset of tidb_table_info is not correctly in sometimes.

Besides, I add two DDL tests based on issue #5154, concerning about clustered index.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

Fix the TiFlash crash issue that occurs after dropping a column of a table with clustered indexes under some situations.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Lloyd-Pottiger
• lidezhu

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[hongyunyan]

/rebuild

[hongyunyan]

/run-all-tests

[sre-bot]

Coverage for changed files

Filename                                                                  Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Core/Block.cpp                                                                214                96    55.14%          43                16    62.79%         376               195    48.14%         140                72    48.57%
Debug/MockTiDB.cpp                                                            154               150     2.60%          35                33     5.71%         481               463     3.74%         102               101     0.98%
Debug/dbgFuncMockRaftCommand.cpp                                               28                28     0.00%           4                 4     0.00%         183               183     0.00%          16                16     0.00%
Debug/dbgFuncMockRaftSnapshot.cpp                                             174               162     6.90%          23                15    34.78%         553               505     8.68%         118               116     1.69%
Debug/dbgFuncRegion.cpp                                                        95                95     0.00%          13                13     0.00%         253               253     0.00%          64                64     0.00%
Debug/dbgTools.cpp                                                            168               166     1.19%          24                22     8.33%         459               446     2.83%         182               182     0.00%
Storages/Transaction/DecodingStorageSchemaSnapshot.h                           33                 1    96.97%           1                 0   100.00%          63                 1    98.41%          26                 2    92.31%
Storages/Transaction/RegionBlockReader.cpp                                     82                26    68.29%           3                 0   100.00%         164                25    84.76%          60                24    60.00%
Storages/Transaction/TiDB.cpp                                                 474               267    43.67%          45                13    71.11%         843               389    53.86%         330               149    54.85%
Storages/Transaction/TiDB.h                                                    20                 7    65.00%          16                 3    81.25%          16                 3    81.25%           6                 6     0.00%
Storages/Transaction/TiKVRecordFormat.h                                        99                10    89.90%          37                 1    97.30%         263                18    93.16%          44                 5    88.64%
Storages/Transaction/tests/RowCodecTestUtils.h                                 76                 4    94.74%          14                 0   100.00%         168                 1    99.40%          30                 2    93.33%
Storages/Transaction/tests/gtest_decoding_storage_schema_snapshot.cpp         251                36    85.66%           3                 0   100.00%          25                 0   100.00%          72                36    50.00%
Storages/Transaction/tests/gtest_region_block_reader.cpp                      593                99    83.31%          21                 0   100.00%         256                 4    98.44%         208                87    58.17%
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                                                        2461              1147    53.39%         282               120    57.45%        4103              2486    39.41%        1398               862    38.34%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
16983      9543             43.81%    191417  96871        49.39%

full coverage report (for internal network access only)

[ti-chi-bot]

@hongyunyan: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

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[JaySon-Huang]

close as no plan for v6.0.1