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branch-4.1: [fix](test) fix flaky case in variables_persist test_mtmv #64365#64427

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branch-4.1: [fix](test) fix flaky case in variables_persist test_mtmv #64365#64427
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Cherry-picked from #64365

Problem Summary:
`test_mtmv` checked `where_mv not chose` after setting
`enable_decimal256=false`, but this is cost/statistics dependent. The
optimizer may still choose `where_mv` as a covering scan and recompute
`f1 * f2` from `f1/f2`.
@github-actions github-actions Bot requested a review from yiguolei as a code owner June 11, 2026 11:08
@hello-stephen

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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

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run buildall

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