polars_arrow::compute::cast

Function primitive_to_dictionary

Source 
pub fn primitive_to_dictionary<T: NativeType + Eq + Hash, K: DictionaryKey>(
    from: &PrimitiveArray<T>,
) -> PolarsResult<DictionaryArray<K>>
Available on crate feature compute_cast only.
Expand description

Cast PrimitiveArray to DictionaryArray. Also known as packing.

ยงErrors

This function errors if the maximum key is smaller than the number of distinct elements in the array.