[DNM]*: add tidb_insert_select_fast_mode

[lance6716]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

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.

None

[ti-chi-bot]

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[tiprow]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 10 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5-20250310-v8.5.1-1@a5d0e02). Learn more about missing BASE report.

Additional details and impacted files

@@                        Coverage Diff                         @@
##             release-8.5-20250310-v8.5.1-1     #60158   +/-   ##
==================================================================
  Coverage                                 ?   56.9314%           
==================================================================
  Files                                    ?       1770           
  Lines                                    ?     627484           
  Branches                                 ?          0           
==================================================================
  Hits                                     ?     357236           
  Misses                                   ?     246108           
  Partials                                 ?      24140           

Flag	Coverage Δ
integration	36.8093% <50.0000%> (?)
unit	72.6051% <45.0000%> (?)

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

Components	Coverage Δ
dumpling	52.8711% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2902% <0.0000%> (?)

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