[core] Fix schema evolution for multiset elements - #9545

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ArnavBalyan commented Sep 2, 2026

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Purpose

Schema evolution fails when updating nested fields or multiset elements.
Paimon generates the nested schema, but the schema manager does not traverse multiset elements and reports that the element column does not exist.
Add multiset traversal/reconstruction to apply nested field evolution.

Tests

UT


          update

fb2d83a

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