Struct Schema

pub struct Schema { /* private fields */ }

Names and types of fields in a table.

Implementations

impl Schema

Auto-generated by derive_getters::Getters.

pub fn schema_id(&self) -> &i32

Identifier of the schema

pub fn identifier_field_ids(&self) -> &Option<Vec<i32>>

Set of primitive fields that identify rows in a table.

pub fn fields(&self) -> &StructType

The struct fields

impl Schema

pub fn builder() -> SchemaBuilder

Creates a new SchemaBuilder to construct a Schema using the builder pattern

Returns

• A SchemaBuilder instance configured with default values

This is the recommended way to construct Schema instances when you need to add fields incrementally or set optional parameters.

pub fn from_struct_type( fields: StructType, schema_id: i32, identifier_field_ids: Option<Vec<i32>>, ) -> Schema

Creates a new Schema from a StructType and associated metadata

Arguments

• fields - The StructType containing the schema’s fields
• schema_id - Unique identifier for this schema
• identifier_field_ids - Optional list of field IDs that identify rows in the table

Returns

• A new Schema instance with the provided fields and metadata

pub fn project(&self, ids: &[i32]) -> Schema

Creates a new Schema containing only the specified field IDs

Arguments

• ids - Array of field IDs to include in the projected schema

Returns

• A new Schema containing only the specified fields, maintaining the original schema ID and any identifier fields that were included in the projection

Methods from Deref<Target = StructType>

pub fn get(&self, index: usize) -> Option<&StructField>

Gets a reference to the StructField at the given index

Arguments

• index - The index of the field to retrieve

Returns

• Some(&StructField) if a field exists at that index
• None if no field exists at that index

pub fn get_name(&self, name: &str) -> Option<&StructField>

Gets a reference to the StructField with the given name

Arguments

• name - The name of the field to retrieve

Returns

• Some(&StructField) if a field with the given name exists
• None if no field with that name exists

pub fn len(&self) -> usize

Returns the number of fields in this struct

Returns

• The total count of StructFields contained in this struct

pub fn is_empty(&self) -> bool

Returns true if the struct contains no fields

Returns

• true if this struct has no fields
• false if this struct has at least one field

pub fn iter(&self) -> Iter<'_, StructField>

Returns an iterator over all fields in this struct

Returns

• An iterator yielding references to each StructField in order

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<(), Error>

Formats the value using the given formatter.

impl Deref for Schema

type Target = StructType

The resulting type after dereferencing.

fn deref(&self) -> &<Schema as Deref>::Target

Dereferences the value.

impl<'de> Deserialize<'de> for Schema

fn deserialize<__D>( __deserializer: __D, ) -> Result<Schema, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Schema

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

Formats the value using the given formatter.

impl From<Schema> for SchemaV1

fn from(value: Schema) -> SchemaV1

Converts to this type from the input type.

impl From<Schema> for SchemaV2

fn from(value: Schema) -> SchemaV2

Converts to this type from the input type.

impl FromStr for Schema

type Err = Error

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Schema, <Schema as FromStr>::Err>

Parses a string s to return a value of this type.

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 as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<SchemaV1> for Schema

type Error = Error

The type returned in the event of a conversion error.

fn try_from( value: SchemaV1, ) -> Result<Schema, <Schema as TryFrom<SchemaV1>>::Error>

Performs the conversion.

impl TryFrom<SchemaV2> for Schema

type Error = Error

The type returned in the event of a conversion error.

fn try_from( value: SchemaV2, ) -> Result<Schema, <Schema as TryFrom<SchemaV2>>::Error>

Performs the conversion.

impl Eq for Schema

impl StructuralPartialEq for Schema