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test: cover Iceberg Variant decimal schema adaptation - #96
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Adds a focused regression for a shredded Iceberg Variant DECIMAL(10,2) physical column. The test exercises field-ID mapping, PhysicalExprAdapter rewrite, unshredding, and preservation of decimal value and scale. This is synthetic physical-schema coverage, not a claim that the historical Snowflake-written file has been revalidated. Verification: cargo +1.97.0 test -p datafusion_iceberg --lib unshreds_snowflake_; cargo +1.97.0 fmt --all -- --check. Independent read-only review approved this narrow test change.