[PR] [core] Fix VARIANT timestamp projection and scalar conversions [paimon-rust]

["XiaoHongbo-Hope (via GitHub)" <gi...@apache.org>]

XiaoHongbo-Hope opened a new pull request, #1151:
URL: https://github.com/apache/paimon-rust/pull/1151

   ### Purpose
   
   Fix incorrect VARIANT timestamp projections, missing Boolean-to-numeric casts, and decimal shredding overflow.
   
   ### Brief change log
   
   - Convert timestamp microseconds to the requested Arrow unit; nanosecond overflow errors in strict mode and returns NULL in tolerant mode.
   - Support Boolean-to-integer, DOUBLE and DECIMAL extraction, consistent with Java.
   - Keep integers in residual storage when they cannot fit the shredded DECIMAL column.
   
   ### Tests
   
   Parquet round-trip regressions cover plain/shredded VARIANT, timestamp units and overflow, Boolean casts, and decimal residuals.
   
   - `cargo test -p paimon --lib variant`: 93 passed.
   - `cargo test -p paimon --lib arrow::shredding`: 49 passed (overlapping coverage).
   - `cargo fmt --all -- --check` and `git diff --check` passed.
   
   ### API and Format
   
   No public API or storage format changes.
   
   ### Documentation
   
   Not required for these correctness fixes.
   


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Re: [PR] [core] Fix VARIANT timestamp projection and scalar conversions [paimon-rust]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #1151:
URL: https://github.com/apache/paimon-rust/pull/1151


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