fresh-borzoni opened a new pull request, #330:
URL: https://github.com/apache/fluss-rust/pull/330
## Summary
closes #87
Replace value-copying FFI layer with opaque Rust-backed types for zero-copy
reads and cheaper writes in CPP bindings.
## Changes
- **Opaque types**: replace
`Datum`/`FfiDatum`/`FfiGenericRow`/`FfiScanRecord` copying infrastructure with
three opaque Rust types — `GenericRowInner` (writes), `ScanResultInner` (scan
reads), `LookupResultInner` (lookup reads)
- **Zero-copy reads**: new `RowView` class borrows directly from Rust scan
results; `LookupResult` class replaces `(bool found, GenericRow out)` pattern
- **`ScanRecord` metadata**: add `change_type` and `partition_id` fields,
matching Python client
- **`AppendArrowBatch`**: write Arrow RecordBatch directly via C Data
Interface
- **`custom_properties`**: support custom table properties in
`TableDescriptor` and `TableInfo`
- **`SetLogFormat` / `SetKvFormat`**: convenience builder methods for
table descriptor
- **`TypeId::Char` / `TypeId::Binary`**: new type support with `DataType`
factory methods
- **Rename `DecimalToString` -> `GetDecimalString`**: consistent getter
naming
- **Remove `DatumType` enum and `Datum` struct**: replaced entirely by
`TypeId` and opaque types
- **Name-based getters via CRTP `NamedGetters` mixin**: shared across
`RowView` and `LookupResult`
- **Examples updated**: demonstrate new APIs including Arrow batch writes,
name-based getters, and `LookupResult`
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