vector: shorten explain output for vector constants

[EricZequan]

What problem does this PR solve?

Issue Number: ref #54245

Problem Summary:

What changed and how does it work?

It is very likely that user passes a vector with very high dimension (e.g. dimension of 1000). Previously we output all values when such SQL is explained, which makes the explain hard to read.

This PR shortens the output and truncates the vector to display only first several elements.

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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[ti-chi-bot]

@EricZequan: 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/check_dev	e20c909	link	true	/test check-dev
idc-jenkins-ci-tidb/unit-test	e20c909	link	true	/test unit-test

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[codecov]

Codecov Report

Attention: Patch coverage is 35.41430% with 1138 lines in your changes missing coverage. Please review.

Project coverage is 74.8030%. Comparing base (1acb8f7) to head (e20c909).
Report is 1 commits behind head on feature/vector-search/vector-data-type.

Additional details and impacted files

@@                              Coverage Diff                               @@
##           feature/vector-search/vector-data-type     #55117        +/-   ##
==============================================================================
+ Coverage                                 72.8511%   74.8030%   +1.9518%     
==============================================================================
  Files                                        1558       1561         +3     
  Lines                                      438406     440124      +1718     
==============================================================================
+ Hits                                       319384     329226      +9842     
+ Misses                                      99322      90305      -9017     
- Partials                                    19700      20593       +893     

Flag	Coverage Δ
integration	30.7199% <3.4110%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	62.9986% <ø> (+17.1243%)	⬆️

[ti-chi-bot]

PR needs rebase.

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[breezewish]

Will use a different impl.