Core: Refresh metadata table schemas and specs after table evolution - #17815
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Summary
PartitionsTableandPositionDeletesTablecache schemas and partition specs at construction time. After the base table evolves and the metadata table is refreshed, long-lived instances may continue exposing stale partition fields, row schemas, and specs.This change derives those values from the current table metadata and ensures partition rows use the schema captured by the scan.
Tests
Tests cover partition spec evolution, base table schema evolution, and partition row materialization after refresh.