Method to_array_of_size

datafusion/expr-common/src/columnar_value.rs:206–221

Convert a columnar value into an Arrow [`ArrayRef`] with the specified number of rows. [`Self::Scalar`] is converted by repeating the same scalar multiple times which is not as efficient as handling the scalar directly. This validates that if this is [`Self::Array`], it has the expected length. See [`Self::values_to_arrays`] to convert multiple columnar values into arrays of the same length. # E

(&self, num_rows: usize)

    /// Errors if `self` is a Scalar that fails to be converted into an array of size or
    /// if the array length does not match the expected length
    pub fn to_array_of_size(&self, num_rows: usize) -> Result<ArrayRef> {
        match self {
            ColumnarValue::Array(array) => {
                if array.len() == num_rows {
                    Ok(Arc::clone(array))
                } else {
                    internal_err!(
                        "Array length {} does not match expected length {}",
                        array.len(),
                        num_rows
                    )
                }
            }
            ColumnarValue::Scalar(scalar) => scalar.to_array_of_size(num_rows),
        }
    }

    /// Null columnar values are implemented as a null array in order to pass batch
    /// num_rows