Trait mz_persist_types::stats::StatsFrom

pub trait StatsFrom<T> {
    // Required method
    fn stats_from(col: &T, validity: ValidityRef) -> Self;
}

A source of aggregate statistics about a column of data.

Required Methods

fn stats_from(col: &T, validity: ValidityRef) -> Self

Computes statistics from a column of data.

The validity, if given, indicates which values in the columns are and are not used for stats. This allows us to model non-nullable columns in a nullable struct. For optional columns (i.e. ones with their own validity) it must be a subset of the column’s validity, otherwise this panics.

Object Safety

This trait is not object safe.

Implementors

impl StatsFrom<BooleanArray> for OptionStats<PrimitiveStats<bool>>

impl StatsFrom<GenericByteArray<GenericBinaryType<i32>>> for BytesStats

impl StatsFrom<GenericByteArray<GenericBinaryType<i32>>> for PrimitiveStats<Vec<u8>>

impl StatsFrom<GenericByteArray<GenericBinaryType<i32>>> for OptionStats<BytesStats>

impl StatsFrom<GenericByteArray<GenericBinaryType<i32>>> for OptionStats<PrimitiveStats<Vec<u8>>>

impl StatsFrom<GenericByteArray<GenericStringType<i32>>> for PrimitiveStats<String>

impl StatsFrom<GenericByteArray<GenericStringType<i32>>> for OptionStats<PrimitiveStats<String>>

impl StatsFrom<BooleanBuffer> for PrimitiveStats<bool>

impl StatsFrom<DynStructCol> for OptionStats<StructStats>

impl StatsFrom<DynStructCol> for StructStats

impl<T: Array> StatsFrom<T> for NoneStats

impl<T: Array> StatsFrom<T> for OptionStats<NoneStats>

impl<T: ArrowPrimitiveType> StatsFrom<PrimitiveArray<T>> for PrimitiveStats<T::Native>

impl<T: ArrowPrimitiveType> StatsFrom<PrimitiveArray<T>> for OptionStats<PrimitiveStats<T::Native>>