Fengzdadi opened a new pull request, #94:
URL: https://github.com/apache/datasketches-go/pull/94
## Related Issue
Follow-up to #90
## Implementation
### Files Added/Modified
| File | Description |
|------|-------------|
| `sampling/serde.go` | SerDe interface and built-in implementations |
| `sampling/serde_test.go` | Serialization tests |
| `sampling/reservoir_items_sketch.go` | Added ToByteArray() and FromSlice()
|
### SerDe Interface
```go
type ItemsSerDe[T any] interface {
SerializeToBytes(items []T) []byte
DeserializeFromBytes(data []byte, numItems int) ([]T, error)
SizeOfItem() int
}
```
### Built-in SerDe
| Type | SerDe | Size |
|------|-------|------|
| `int64` | `Int64SerDe` | 8 bytes |
| `int32` | `Int32SerDe` | 4 bytes |
| `float64` | `Float64SerDe` | 8 bytes |
| `string` | `StringSerDe` | length prefix + content |
### Usage
```go
// Serialize
bytes, _ := sketch.ToByteArray(sampling.Int64SerDe{})
// Deserialize
restored, _ := sampling.NewReservoirItemsSketchFromSlice[int64](bytes,
sampling.Int64SerDe{})
```
## Notes
- Uses little-endian byte order for cross-language compatibility
- Custom types: users implement `ItemsSerDe[T]` interface
## Testing
All tests pass:
```
go test ./sampling/
ok github.com/apache/datasketches-go/sampling
```
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