fresh-borzoni opened a new pull request, #265:
URL: https://github.com/apache/fluss-rust/pull/265
## Summary
Add decimal type support to C++ bindings
Adds `DECIMAL(p, s)` support to the C++ bindings, matching the Python
bindings' schema-driven pattern.
### Write path
- User calls `row.SetDecimal(idx, "123.45")` — just a string, no
precision/scale needed
- String crosses FFI as-is (`DATUM_TYPE_DECIMAL_STRING`)
- Rust parses via `BigDecimal::from_str`, looks up `(p, s)` from the
schema, validates, and creates the `Decimal`
### Read path
- Arrow `Decimal128` values come back as `DecimalI64` (compact, p≤18) or
`DecimalI128` (non-compact)
- `Datum::DecimalToString()` formats them for display
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