QuakeWang opened a new pull request, #477:
URL: https://github.com/apache/paimon-rust/pull/477
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### Purpose
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Rust append writes currently emit empty `_VALUE_STATS`, so manifest-level
stats pruning cannot skip data files written by Rust even when
min/max/null-count information is available.
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### Brief change log
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they address the issue -->
- Accumulate min/max/null-count value stats across batches in
`DataFileWriter`.
- Persist stats in existing `DataFileMeta.value_stats` and dense
`value_stats_cols`.
- Skip unsupported variable-length value stats and add nanosecond
timestamp extraction support.
- Add tests for value stats writing, timestamp(9), skipped variable-length
columns, and scan pruning.
### Tests
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- `cargo fmt --all -- --check`
- `cargo clippy --all-targets --workspace --features
fulltext,vortex,mosaic -- -D warnings`
- `cargo test -p paimon --all-targets --features fulltext,vortex,mosaic`
### API and Format
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### Documentation
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