Struct Schema 

pub struct Schema {
    pub schema_id: i32,
    pub fields: Vec<Field>,
    pub identifier_field_ids: Vec<i32>,
}

A schema defines the structure of records in a table.

Schemas are immutable once created. Schema evolution is achieved by creating new schemas and updating the table’s current schema reference.

Example

use supercore::schema::{Schema, Field, Type};

let schema = Schema::builder(0)
    .with_field(1, "id", Type::Long, true)
    .with_field(2, "name", Type::String, true)
    .with_field(3, "email", Type::String, false)
    .build();

Fields

schema_id: i32

Unique identifier for this schema version.

fields: Vec<Field>

The list of fields in this schema.

identifier_field_ids: Vec<i32>

Optional identifier field IDs (for tables with primary keys).

Implementations

impl Schema

pub fn to_arrow_schema(&self) -> Schema

Converts this schema to an Arrow schema.

pub fn to_arrow_schema_ref(&self) -> SchemaRef

Converts this schema to an Arrow SchemaRef.

pub fn to_df_schema(&self) -> Result<DFSchema>

Converts this schema to a DataFusion DFSchema.

pub fn builder(schema_id: i32) -> SchemaBuilder

Creates a new schema builder.

pub fn find_field(&self, field_id: i32) -> Option<&Field>

Finds a field by its ID.

pub fn find_field_by_name(&self, name: &str) -> Option<&Field>

Finds a field by its name.

pub fn highest_field_id(&self) -> i32

Returns the highest field ID in this schema.

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<'de> Deserialize<'de> for Schema

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Schema

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

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Schema