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branch-4.2: [fix](be) Replay schema-change WAL with duplicate column IDs #70160 - #70300
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### What problem does this PR solve? Heavy ALTER operations can write base and shadow columns with the same ID into Group Commit WALs. V2 rejects these valid headers as corruption. Accept duplicate IDs while preserving physical column order and the existing first-column mapping. Related PR: #66008 ### Release note Fix Group Commit WAL replay failures during heavy schema changes with FileScannerV2.
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BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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yiguolei
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Nov 10, 2026
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Cherry-picked from #70160