mz_persist_types::stats::structured

Struct StructStats

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pub struct StructStats {
    pub len: usize,
    pub cols: BTreeMap<String, ColumnarStats>,
}
Expand description

Statistics about a column of a struct type with a uniform schema (the same columns and associated T: Data types in each instance of the struct).

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§len: usize

The count of structs in the column.

§cols: BTreeMap<String, ColumnarStats>

Statistics about each of the columns in the struct.

This will often be all of the columns, but it’s not guaranteed. Persist reserves the right to prune statistics about some or all of the columns.

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impl StructStats

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pub fn col(&self, name: &str) -> Option<&ColumnarStats>

Returns the statistics for the specified column in the struct, if they exist.

This will often be all of the columns, but it’s not guaranteed. Persist reserves the right to prune statistics about some or all of the columns.

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impl Arbitrary for StructStats

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type Parameters = <usize as Arbitrary>::Parameters

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default.
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type Strategy = Map<(<usize as Arbitrary>::Strategy, BoxedStrategy<BTreeMap<String, ColumnarStats>>), fn(_: (usize, BTreeMap<String, ColumnarStats>)) -> StructStats>

The type of Strategy used to generate values of type Self.
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fn arbitrary_with(_top: Self::Parameters) -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). The strategy is passed the arguments given in args. Read more
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fn arbitrary() -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). Read more
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impl Clone for StructStats

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fn clone(&self) -> StructStats

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl ColumnStats for StructStats

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type Ref<'a> = ()

Type returned as the stat bounds.
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fn lower<'a>(&'a self) -> Option<Self::Ref<'a>>

An inclusive lower bound on the data contained in the column, if known. Read more
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fn upper<'a>(&'a self) -> Option<Self::Ref<'a>>

Same as Self::lower but an (also inclusive) upper bound.
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fn none_count(&self) -> usize

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

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

Formats the value using the given formatter. Read more
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impl Default for StructStats

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fn default() -> StructStats

Returns the “default value” for a type. Read more
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impl DynStats for StructStats

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fn debug_json(&self) -> Value

Formats these statistics for use in INSPECT SHARD and debugging.
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fn into_columnar_stats(self) -> ColumnarStats

Return self as ColumnarStats.
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fn type_name(&self) -> &'static str

Returns the name of the erased type for use in error messages.
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impl From<StructStats> for ColumnStatKinds

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fn from(value: StructStats) -> Self

Converts to this type from the input type.
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impl RustType<ProtoStructStats> for StructStats

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fn into_proto(&self) -> ProtoStructStats

Convert a Self into a Proto value.
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fn from_proto(proto: ProtoStructStats) -> Result<Self, TryFromProtoError>

Consume and convert a Proto back into a Self value. Read more
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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.
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impl Serialize for StructStats

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fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer. Read more

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, U> CastInto<U> for T
where U: CastFrom<T>,

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fn cast_into(self) -> U

Performs the cast.
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromRef<T> for T
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fn from_ref(input: &T) -> T

Converts to this type from a reference to the input type.
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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

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type Output = T

Should always be Self
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