Struct mz_persist_types::stats::ColumnarStats

pub struct ColumnarStats {
    pub nulls: Option<ColumnNullStats>,
    pub values: ColumnStatKinds,
}

Statistics for a single column of data.

Fields

nulls: Option<ColumnNullStats>

Expected to be None if the associated column is non-nullable.

values: ColumnStatKinds

Statistics on the values of the column.

Implementations

impl ColumnarStats

pub fn one_column_struct(len: usize, col: ColumnStatKinds) -> StructStats

Returns a [StructStats] with a single non-nullable column.

pub fn as_non_null_values(&self) -> Option<&ColumnStatKinds>

Returns the inner ColumnStatKinds if nulls is None.

pub fn into_non_null_values(self) -> Option<ColumnStatKinds>

Returns the inner ColumnStatKinds if nulls is None.

pub fn into_struct_stats(self) -> Option<StructStats>

Returns the inner StructStats if nulls is None and values is ColumnStatKinds::Struct.

fn try_as_stats<'a, T, F>(&'a self, map: F) -> Result<T, Error>

where F: FnOnce(&'a ColumnStatKinds) -> Result<T, Error>,

Helper method to “downcast” to stats of type T.

fn try_as_option_stats<'a, T, F>( &'a self, map: F, ) -> Result<OptionStats<T>, Error>

where F: FnOnce(&'a ColumnStatKinds) -> Result<T, Error>,

Helper method to “downcast” OptionStats<T>.

pub fn try_as_optional_struct(&self) -> Result<OptionStats<&StructStats>, Error>

Tries to “downcast” this instance of ColumnarStats to an OptionStats<StructStats> if the inner statistics are nullable and for a structured column.

pub fn try_as_optional_bytes(&self) -> Result<OptionStats<&BytesStats>, Error>

Tries to “downcast” this instance of ColumnarStats to an OptionStats<BytesStats> if the inner statistics are nullable and for a column of bytes.

pub fn try_as_string(&self) -> Result<&PrimitiveStats<String>, Error>

Tries to “downcast” this instance of ColumnarStats to a PrimitiveStats<String> if the inner statistics are nullable and for a structured column.

Trait Implementations

impl Clone for ColumnarStats

fn clone(&self) -> ColumnarStats

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnarStats

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

Formats the value using the given formatter.

impl DynStats for ColumnarStats

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.

impl RustType<ProtoDynStats> for ColumnarStats

fn into_proto(&self) -> ProtoDynStats

Convert a Self into a Proto value.

fn from_proto(proto: ProtoDynStats) -> Result<Self, TryFromProtoError>

Consume and convert a Proto back into a Self value.

fn into_proto_owned(self) -> Proto

A zero clone version of Self::into_proto that types can optionally implement, otherwise, the default implementation delegates to Self::into_proto.