Struct mz_expr::row::collection::RowCollection

pub struct RowCollection {
    encoded: Bytes,
    metadata: Vec<EncodedRowMetadata>,
    runs: Vec<usize>,
}

Collection of runs of sorted Rows represented as a single blob.

Note: the encoding format we use to represent Rows in this struct is not stable, and thus should never be persisted durably.

Fields

encoded: Bytes

Contiguous blob of encoded Rows.

metadata: Vec<EncodedRowMetadata>

Metadata about an individual Row in the blob.

runs: Vec<usize>

Ends of non-empty, sorted runs of rows in index into metadata.

Implementations

impl RowCollection

pub fn new(rows: Vec<(Row, NonZeroUsize)>, order_by: &[ColumnOrder]) -> Self

Create a new RowCollection from a collection of Rows. Sorts data by order_by.

Note that all row collections to be merged must be constructed with the same order_by to ensure a consistent sort order. Anything else is undefined behavior.

pub fn merge(&mut self, other: &RowCollection)

Merge another RowCollection into self.

pub fn count(&self, offset: usize, limit: Option<usize>) -> usize

Total count of Rows represented by this collection, considering a possible OFFSET and LIMIT.

pub fn entries(&self) -> usize

Total count of (Row, EncodedRowMetadata) pairs in this collection.

pub fn byte_len(&self) -> usize

Returns the number of bytes this RowCollection uses.

pub fn get(&self, idx: usize) -> Option<(&RowRef, &EncodedRowMetadata)>

Returns a RowRef for the entry at idx, if one exists.

pub fn sorted_view(self, order_by: &[ColumnOrder]) -> SortedRowCollection

“Sorts” the RowCollection by the column order in order_by. Returns a sorted view over the collection.

fn sorted_view_inner<F>(self, cmp: &F) -> SortedRowCollection

where F: Fn(&RowRef, &RowRef) -> Ordering,

Trait Implementations

impl Clone for RowCollection

fn clone(&self) -> RowCollection

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RowCollection

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

Formats the value using the given formatter.

impl Default for RowCollection

fn default() -> RowCollection

Returns the “default value” for a type.

impl PartialEq for RowCollection

fn eq(&self, other: &RowCollection) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl RustType<ProtoRowCollection> for RowCollection

fn into_proto(&self) -> ProtoRowCollection

Convert a Self into a Proto value.

fn from_proto(proto: ProtoRowCollection) -> 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.

impl StructuralPartialEq for RowCollection