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refactor(rust!): Refactor AnyValue supertype logic (#15280)
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Original file line number | Diff line number | Diff line change |
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use crate::prelude::*; | ||
use crate::utils::dtypes_to_supertype; | ||
|
||
/// Determine the supertype of a collection of [`AnyValue`]. | ||
/// | ||
/// [`AnyValue`]: crate::datatypes::AnyValue | ||
pub fn any_values_to_supertype<'a, I>(values: I) -> PolarsResult<DataType> | ||
where | ||
I: IntoIterator<Item = &'a AnyValue<'a>>, | ||
{ | ||
let dtypes = any_values_to_dtype_set(values); | ||
dtypes_to_supertype(&dtypes) | ||
} | ||
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||
/// Determine the supertype and the number of unique data types of a collection of [`AnyValue`]. | ||
/// | ||
/// [`AnyValue`]: crate::datatypes::AnyValue | ||
pub fn any_values_to_supertype_and_n_dtypes<'a, I>(values: I) -> PolarsResult<(DataType, usize)> | ||
where | ||
I: IntoIterator<Item = &'a AnyValue<'a>>, | ||
{ | ||
let dtypes = any_values_to_dtype_set(values); | ||
let supertype = dtypes_to_supertype(&dtypes)?; | ||
let n_dtypes = dtypes.len(); | ||
Ok((supertype, n_dtypes)) | ||
} | ||
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||
/// Extract the ordered set of data types from a collection of AnyValues | ||
/// | ||
/// Retaining the order is important if the set is used to determine a supertype, | ||
/// as this can influence how Struct fields are constructed. | ||
fn any_values_to_dtype_set<'a, I>(values: I) -> PlIndexSet<DataType> | ||
where | ||
I: IntoIterator<Item = &'a AnyValue<'a>>, | ||
{ | ||
values.into_iter().map(|av| av.into()).collect() | ||
} |
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