planner: Fix Join reorder occurs "index out of range" error

[mmyj]

What problem does this PR solve?

Issue Number: close #24095

Problem Summary:

for i, col := range p.Schema().Columns {
  if !col.Equal(nil, originalSchema.Columns[i]) {
	  schemaChanged = true
	  break
  }
}

Panic when len(p.Schema().Columns) != len(originalSchema.Columns)

What is changed and how it works?

Related changes

Check List

Tests

• Unit test

Release note

• Fix Join reorder occurs "index out of range" error

[zhouqiang-cl]

/run-all-tests

[zhouqiang-cl]

/run-check-title

[zhouqiang-cl]

/run-check-title

[purelind]

/run-check-title

[purelind]

/run-all-tests

[dianqihanwangzi]

/run-all-tests

[eurekaka]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• eurekaka
• hanfei1991

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[eurekaka]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ef621af

[qw4990]

/run-cherry-picker

[ti-srebot]

cherry pick to release-5.0 in PR #30881