Struct Schema 

pub struct Schema { /* private fields */ }

The fixed schema shared by every block in an Acta file.

Implementations

impl Schema

pub fn new( schema_id: u64, columns: Vec<Column>, primary_column_id: Option<u32>, ) -> Self

Construct immutable schema metadata.

Schema validation that depends on the file format is performed by crate::Writer::create.

pub fn schema_id(&self) -> u64

The nonzero schema ID stored in the schema and data headers.

pub fn columns(&self) -> &[Column]

The columns in schema order, which is the order the file declares them and the order a reader reports them.

Section 7 does not require that order to be sorted by column ID. Only a data frame’s column table is sorted, and the writer sorts it there.

pub fn column_count(&self) -> usize

The number of declared columns.

pub fn primary_column(&self) -> Option<&Column>

The selected primary timestamp/date column, if the schema has one.

pub fn primary_column_id(&self) -> Option<u32>

The selected primary timestamp/date column ID, if present.

pub fn column_by_id(&self, id: u32) -> Option<&Column>

Find a column by its stable ID.

pub fn column_by_name(&self, name: &str) -> Option<&Column>

Find a column by its exact UTF-8 name.

Trait Implementations

impl Clone for Schema

fn clone(&self) -> Schema

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Schema

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

Formats the value using the given formatter.

impl Eq for Schema

impl PartialEq for Schema

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Schema