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branch-4.2: [test](paimon) Verify Paimon null partition refresh and rewrite #70201 - #70283
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### What problem does this PR solve? Related PRs: #65904, #64304 The existing Paimon MTMV regression covers the initial refresh of a NULL partition. This test covers an out-of-band Spark append to that partition after the initial refresh. It verifies that the stale partition is ineligible for rewrite, automatic refresh touches only the NULL partition, and the refreshed MV is chosen again. The string partition 'null' is a control. The suite compares live SQL results and checks the rewrite plan without a golden output file. This PR adds regression coverage only. ### Release note None ### Check List (For Author) - Test: `git diff --check` passed. Doris compilation and regression execution were not run. - Behavior changed: No - Does this need documentation: No
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Cherry-picked from #70201