Struct mz_persist_types::dyn_struct::ValidityRef

pub struct ValidityRef(pub(crate) Option<NullBuffer>);

A new-type wrapper for an arrow validity column.

The arrow crate has an optimization where the validity column can be elided if every value is true. This is the common case for the Ok struct of our SourceData, so seems worth opting in to ourselves.

Note: NullBuffer is internally reference counted so cloning is cheap.

Tuple Fields

0: Option<NullBuffer>

Implementations

impl ValidityRef

pub fn none() -> Self

Returns a validity that indicates true for all values.

pub fn get(&self, idx: usize) -> bool

Returns whether a column of optional structs is Some at the given index. If this is false, the contents of the struct’s component fields at idx will be undefined.

pub fn is_superset(&self, other: Option<&NullBuffer>) -> bool

Returns whether the set of all indexes that return true in self is a superset of the set of all indexes that return true in other.

Trait Implementations

impl Clone for ValidityRef

fn clone(&self) -> ValidityRef

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ValidityRef

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

Formats the value using the given formatter.