fresh-borzoni opened a new pull request, #239: URL: https://github.com/apache/fluss-rust/pull/239
## Summary
Add KV table support (lookup/upsert/delete) to Python bindings.
## Changes
### Python Bindings
- **`Lookuper`**: Point lookups by primary key with cached encoders
- **`UpsertWriter`**: Batched upsert/delete with explicit `flush()`
- Supports partial updates via `columns` or `column_indices` parameters
- **Rust → Python converters**: Date, Time, Timestamp, TimestampLtz,
Decimal
### Rust Core
- Removed lifetime `'a` from `TableLookup`, `Lookuper`, `LookupResult`
- Changed `&'a FlussConnection` → `Arc<RpcClient>` (enables Python to
store Lookuper)
- Added `Send + Sync` bounds to `KeyEncoder` and `RowEncoder` traits
- Fixed broken doctests in `scanner.rs`
## Usage
```python
# Lookup
lookuper = table.new_lookup()
result = lookuper.lookup({"user_id": 1}) # Returns dict or None
# Upsert with batching
writer = table.new_upsert()
writer.upsert({"user_id": 1, "name": "Alice", ...})
writer.upsert({"user_id": 2, "name": "Bob", ...})
writer.delete({"user_id": 3})
writer.flush() # Single batch RPC
# Partial update
writer = table.new_upsert(columns=["user_id", "balance"])
writer.upsert({"user_id": 1, "balance": Decimal("100.00")})
writer.flush()
```
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