Struct SparseRecord 

pub struct SparseRecord {
    pub fields: PathFieldSet,
    pub values: Vec<Value>,
}

A record where only a subset of fields are populated.

Unlike ValueRecord (which stores values for every field by position), SparseRecord tracks which field indices are present via a PathFieldSet and stores corresponding values. Fields not in the set are absent (not merely null).

Iterating over a SparseRecord yields (usize, Value) pairs of field index and value.

Examples

use toasty_core::stmt::{Value, PathFieldSet};

// Create a sparse record with field 0 populated
let v = Value::empty_sparse_record();
assert!(matches!(v, Value::SparseRecord(_)));

Fields

fields: PathFieldSet

Bit set of field indices that are populated in this record.

values: Vec<Value>

Values indexed by field position. Indices not in fields contain placeholder Value::Null entries.

Trait Implementations

impl Clone for SparseRecord

fn clone(&self) -> SparseRecord

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SparseRecord

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

Formats the value using the given formatter.

impl From<SparseRecord> for Value

fn from(value: SparseRecord) -> Self

Converts to this type from the input type.

impl Hash for SparseRecord

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoIterator for SparseRecord

type Item = (usize, Value)

The type of the elements being iterated over.

type IntoIter = Box<dyn Iterator<Item = (usize, Value)>>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl PartialEq for SparseRecord

fn eq(&self, other: &SparseRecord) -> 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 Eq for SparseRecord

impl StructuralPartialEq for SparseRecord