Struct mz_persist_types::stats::OptionStats

pub struct OptionStats<T> {
    pub some: T,
    pub none: usize,
}

Statistics about a column of some optional type.

Fields

some: T

Statistics about the Some values in the column.

none: usize

The count of None values in the column.

Trait Implementations

impl ColumnStats for OptionStats<BytesStats>

type Ref<'a> = Option<&'a [u8]>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<NoneStats>

type Ref<'a> = Option<()>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<String>>

type Ref<'a> = Option<&'a str>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<bool>>

type Ref<'a> = Option<bool>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<f32>>

type Ref<'a> = Option<f32>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<f64>>

type Ref<'a> = Option<f64>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<i16>>

type Ref<'a> = Option<i16>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<i32>>

type Ref<'a> = Option<i32>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<i64>>

type Ref<'a> = Option<i64>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<i8>>

type Ref<'a> = Option<i8>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<u16>>

type Ref<'a> = Option<u16>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<u32>>

type Ref<'a> = Option<u32>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<u64>>

type Ref<'a> = Option<u64>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<PrimitiveStats<u8>>

type Ref<'a> = Option<u8>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl ColumnStats for OptionStats<StructStats>

type Ref<'a> = Option<()>

Type returned as the stat bounds.

fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known.

fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.

fn none_count(&self) -> usize

The number of Nones if this column is optional or 0 if it isn’t.

impl<I, T> ColumnarStatsBuilder<Option<I>> for OptionStats<T>

where T: ColumnarStatsBuilder<I> + DynStats, T::FinishedStats: Into<ColumnStatKinds>,

type ArrowColumn = <T as ColumnarStatsBuilder<I>>::ArrowColumn

Type of arrow column these statistics can be derived from.

type FinishedStats = ColumnarStats

The type of statistics the collector finalizes into.

fn from_column(col: &Self::ArrowColumn) -> Self

where Self: Sized,

Derive statistics from a column of data.

fn finish(self) -> Self::FinishedStats

where Self::FinishedStats: Sized,

Finish this collector returning the final aggregated statistics.

fn from_column_dyn(col: &dyn Array) -> Option<Self>

where Self: Sized,

Derive statistics from an opaque column of data.

impl<T: DynStats> Debug for OptionStats<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: DynStats> DynStats for OptionStats<T>

fn debug_json(&self) -> Value

Formats these statistics for use in INSPECT SHARD and debugging.

fn into_columnar_stats(self) -> ColumnarStats

Return self as ColumnarStats.

fn type_name(&self) -> &'static str

Returns the name of the erased type for use in error messages.