doki23 opened a new issue, #11503:
URL: https://github.com/apache/datafusion/issues/11503
### Is your feature request related to a problem or challenge?
We have a `into_array` function of `ColumnarValue` which converts it into an
arrow array like this:
```rust
pub fn into_array(self, num_rows: usize) -> Result<ArrayRef> {
Ok(match self {
ColumnarValue::Array(array) => array,
ColumnarValue::Scalar(scalar) =>
scalar.to_array_of_size(num_rows)?,
})
}
```
If this column is of an Int32 type, it returns an Int32Array.
Given that the `ColumnarValue::Scalar`'s cardinality is 1, in some special
cases, we can turn it into a dictionary array in order to obtain some
performance gains.
### Describe the solution you'd like
For example, if we want to turn a scalar value of f64 type into an array of
size 256, we can return a dictionary f64 array of uint8 key type.
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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