fix(tianmu): the instance crashed while exporting data (#1961)

[TomeC]

Summary about this PR

Issue Number: close #1961

Tests Check List

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

Changelog

• New Feature
• Bug Fix
• Performance Improvement
• Build/Testing/CI/CD
• Documentation
• Not for changelog (changelog entry is not required)

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features

[mergify]

Thanks for the contribution!
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[TomeC]

@Nliver StoneDB Compile & MTR failed, reason:

This request was automatically failed because there were no enabled runners online to process the request for more than 1 days.

[Nliver]

@Nliver StoneDB Compile & MTR failed, reason:

This request was automatically failed because there were no enabled runners online to process the request for more than 1 days.

Thanks a lot, We will check this issue and fix it~

[Nliver]

@Nliver StoneDB Compile & MTR failed, reason:

This request was automatically failed because there were no enabled runners online to process the request for more than 1 days.

Hello, our Github Action has been restored~

[codecov]

Codecov Report

Attention: 57 lines in your changes are missing coverage. Please review.

Comparison is base (6a560a0) 60.23% compared to head (5c4dad0) 60.07%.
Report is 28 commits behind head on stonedb-5.7-dev.

Files	Patch %	Lines
storage/tianmu/core/tianmu_table.cpp	5.55%	17 Missing ⚠️
storage/tianmu/handler/ha_tianmu.cpp	0.00%	9 Missing ⚠️
storage/tianmu/core/engine.cpp	53.33%	7 Missing ⚠️
storage/tianmu/loader/load_parser.cpp	55.55%	4 Missing ⚠️
sql/sql_yacc.yy	0.00%	3 Missing ⚠️
storage/tianmu/optimizer/aggregator_basic.cpp	40.00%	3 Missing ⚠️
storage/tianmu/core/value_or_null.cpp	77.77%	2 Missing ⚠️
storage/tianmu/vc/multi_value_column.h	0.00%	2 Missing ⚠️
sql/binlog.cc	0.00%	1 Missing ⚠️
storage/tianmu/core/item_tianmu_field.cpp	80.00%	1 Missing ⚠️
... and 8 more

Additional details and impacted files

@@                 Coverage Diff                 @@
##           stonedb-5.7-dev    #1964      +/-   ##
===================================================
- Coverage            60.23%   60.07%   -0.17%     
===================================================
  Files                 1837     1837              
  Lines               380671   380786     +115     
===================================================
- Hits                229316   228744     -572     
- Misses              151355   152042     +687     

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[TomeC]

codecov/project Failing, But according to the prompts, I did not modify those files.

[Nliver]

codecov/project Failing, But according to the prompts, I did not modify those files.

We are checking what caused it and fixing the problem later~

[mergify]

Thanks for the contribution!
I have applied any labels matching special text in your PR Changelog.

Please review the labels and make any necessary changes.