planner/core: Key partitioning uses an column index, which did not match value pairs in fast plan (#50210)

[ti-chi-bot]

This is an automated cherry-pick of #50210

What problem does this PR solve?

Issue Number: close #50206

Problem Summary:
The column index was set to the second column, but in Fast Plan the value pairs is always the first one, so it needed to be adjusted for Key Partitioned tables.

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

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.5@8aa2293). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #50603   +/-   ##
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Flag	Coverage Δ
unit	72.0551% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.3163% <0.0000%> (?)

[mjonss]

/retest

[bb7133]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-23 16:28:33.990992456 +0000 UTC m=+891755.555290160: ☑️ agreed by mjonss.
• 2024-01-24 22:05:59.603952316 +0000 UTC m=+998401.168250022: ☑️ agreed by bb7133.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, mjonss, tangenta

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