ameyc opened a new issue, #11369:
URL: https://github.com/apache/datafusion/issues/11369
### Is your feature request related to a problem or challenge?
When running continuous computations, we'd like to snapshot the state of our
operators many of which use accumulators. This would be key to make
computations over continuous streams a first class citizen in DataFusion (see
#11365 ).
### Describe the solution you'd like
Addition of a `SerializableAccumulator` trait -
```
pub trait SerializableAccumulator: Accumulator {
fn serialize(&self) -> Result<Vec<u8>>;
fn deserialize(bytes: &[u8]) -> Result<Box<dyn Accumulator>>
where
Self: Sized;
}
```
as well as a method on the `Accumulator` trait -
```
fn as_serializable(&self) -> Option<&dyn SerializableAccumulator> {
None
}
```
This would mean `ScalarValue` also needs to implement serialization to [u8].
We have a [POC PR on our fork of
DataFusion](https://github.com/probably-nothing-labs/arrow-datafusion/pull/22/files)
for this.
Would love to hear feedback from the community on this proposal.
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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