[feat](mtmv)external table support partition rewrite

[zddr]

What problem does this PR solve?

Previously, transparent rewriting of the external table could only be done as a whole or without rewriting.

Now supports partial partition rewriting and direct lookup of the base table for some partitions.

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:
external table support partition rewrite

Release note

external table support partition rewrite

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

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[zddr]

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[zddr]

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