thinkharderdev commented on PR #2177:
URL:
https://github.com/apache/arrow-datafusion/pull/2177#issuecomment-1100368801
> what about `Result<Vec<ColumnarValue>>`. I already almost implemented it
this way:)
>
> > > It seems like a table function should produce RecordBatchs and
effectively compile down to an ExecutionPlan.
> >
> >
> > I agree it should definitely produce `RecordBatch`
That's essentially a `RecordBatch` :)
You could have
```rust
pub type TableFunctionImplementation =
Arc<dyn Fn(&[ColumnarValue]) -> Result<Vec<ColumnarValue>> + Send +
Sync>;
// This is a terrible name but this would be analogous to
ReturnTypeFunction/StateTypeFunction
pub type TableSchemaFunction =
Arc<dyn Fn(&[DataType]) -> Result<SchemaRef> + Send + Sync>;
```
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