[Improvement](function) optimize trivial function deserialize_and_merge_vec

[BiteTheDDDDt]

What problem does this PR solve?

SELECT
  max(csales) tpcds_cmax
FROM
  (
    SELECT
      c_customer_sk,
      sum((ss_quantity * ss_sales_price)) csales
    FROM
      store_sales,
      customer,
      date_dim
    WHERE
      (ss_customer_sk = c_customer_sk)
      AND (ss_sold_date_sk = d_date_sk)
      AND (
        d_year IN (
          2000,
          (2000 + 1),
          (2000 + 2),
          (2000 + 3)
        )
      )
    GROUP BY
      c_customer_sk
  ) x;

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

[BiteTheDDDDt]

run buildall

[hello-stephen]

Thank you for your contribution to Apache Doris. Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[hello-stephen]

BE UT Coverage Report

Increment line coverage 36.36% (32/88) :tada:

Increment coverage report Complete coverage report

Category	Coverage
Function Coverage	53.36% (18716/35072)
Line Coverage	39.07% (173049/442959)
Region Coverage	33.76% (134301/397766)
Branch Coverage	34.66% (57691/166444)

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 62.50% (55/88) :tada:

Increment coverage report Complete coverage report

Category	Coverage
Function Coverage	72.24% (24831/34374)
Line Coverage	58.96% (260905/442481)
Region Coverage	53.98% (217263/402489)
Branch Coverage	55.47% (92805/167319)

[BiteTheDDDDt]

run buildall

[hello-stephen]

BE UT Coverage Report

Increment line coverage 36.36% (32/88) :tada:

Increment coverage report Complete coverage report

Category	Coverage
Function Coverage	53.36% (18716/35072)
Line Coverage	39.06% (173037/442959)
Region Coverage	33.74% (134215/397766)
Branch Coverage	34.65% (57680/166444)

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 62.50% (55/88) :tada:

Increment coverage report Complete coverage report

Category	Coverage
Function Coverage	72.33% (24863/34374)
Line Coverage	59.07% (261382/442483)
Region Coverage	53.91% (216974/402489)
Branch Coverage	55.54% (92931/167319)

[BiteTheDDDDt]

run buildall

[BiteTheDDDDt]

run buildall

[BiteTheDDDDt]

run buildall

[BiteTheDDDDt]

run buildall

[BiteTheDDDDt]

run buildall

[BiteTheDDDDt]

run buildall

[BiteTheDDDDt]

run buildall