Struct SchemaLayout 

pub struct SchemaLayout { /* private fields */ }

Pre-computed layout for binary encoding/decoding

Implementations

impl SchemaLayout

pub fn new( columns: Vec<ColumnLayout>, row_stride: usize, null_mask_size: usize, ) -> SchemaLayout

Create a SchemaLayout directly from components

pub fn from_schema(schema: &Table) -> SchemaLayout

Create a SchemaLayout from a table schema

pub fn from_schemas(schemas: &[&Table]) -> SchemaLayout

Create a SchemaLayout by merging multiple table schemas (for JOIN results). Columns are concatenated in order: left table columns, then right table columns, etc. Right-side columns are marked nullable since LEFT JOIN can produce NULLs.

pub fn from_projection(schema: &Table, column_names: &[String]) -> SchemaLayout

Create a SchemaLayout from projected columns

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

Get the columns

pub fn row_stride(&self) -> usize

Get row stride (total bytes per row)

pub fn null_mask_size(&self) -> usize

Get null mask size in bytes

pub fn calculate_fixed_size(&self, row_count: usize) -> usize

Calculate required buffer size for N rows (header + fixed section only)

impl SchemaLayout

pub fn column_count_js(&self) -> usize

Get the number of columns

pub fn column_name_js(&self, idx: usize) -> Option<String>

Get column name by index

pub fn column_type_js(&self, idx: usize) -> Option<u8>

Get column type by index (returns BinaryDataType as u8)

pub fn column_offset_js(&self, idx: usize) -> Option<usize>

Get column offset by index (offset within row, after null_mask)

pub fn column_fixed_size_js(&self, idx: usize) -> Option<usize>

Get column fixed size by index

pub fn column_nullable_js(&self, idx: usize) -> Option<bool>

Check if column is nullable

pub fn row_stride_js(&self) -> usize

Get row stride (total bytes per row)

pub fn null_mask_size_js(&self) -> usize

Get null mask size in bytes

Trait Implementations

impl Clone for SchemaLayout

fn clone(&self) -> SchemaLayout

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SchemaLayout

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

Formats the value using the given formatter.

impl From<SchemaLayout> for JsValue

fn from(value: SchemaLayout) -> JsValue

Converts to this type from the input type.

impl FromWasmAbi for SchemaLayout

type Abi = u32

The Wasm ABI type that this converts from when coming back out from the ABI boundary.

unsafe fn from_abi(js: u32) -> SchemaLayout

Recover a Self from Self::Abi.

impl IntoWasmAbi for SchemaLayout

type Abi = u32

The Wasm ABI type that this converts into when crossing the ABI boundary.

fn into_abi(self) -> u32

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl LongRefFromWasmAbi for SchemaLayout

type Abi = u32

Same as RefFromWasmAbi::Abi

type Anchor = RcRef<SchemaLayout>

Same as RefFromWasmAbi::Anchor

unsafe fn long_ref_from_abi( js: <SchemaLayout as LongRefFromWasmAbi>::Abi, ) -> <SchemaLayout as LongRefFromWasmAbi>::Anchor

Same as RefFromWasmAbi::ref_from_abi

impl OptionFromWasmAbi for SchemaLayout

fn is_none(abi: &<SchemaLayout as FromWasmAbi>::Abi) -> bool

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl OptionIntoWasmAbi for SchemaLayout

fn none() -> <SchemaLayout as IntoWasmAbi>::Abi

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option.

impl RefFromWasmAbi for SchemaLayout

type Abi = u32

The Wasm ABI type references to Self are recovered from.

type Anchor = RcRef<SchemaLayout>

The type that holds the reference to Self for the duration of the invocation of the function that has an &Self parameter. This is required to ensure that the lifetimes don’t persist beyond one function call, and so that they remain anonymous.

unsafe fn ref_from_abi( js: <SchemaLayout as RefFromWasmAbi>::Abi, ) -> <SchemaLayout as RefFromWasmAbi>::Anchor

Recover a Self::Anchor from Self::Abi.

impl RefMutFromWasmAbi for SchemaLayout

type Abi = u32

Same as RefFromWasmAbi::Abi

type Anchor = RcRefMut<SchemaLayout>

Same as RefFromWasmAbi::Anchor

unsafe fn ref_mut_from_abi( js: <SchemaLayout as RefMutFromWasmAbi>::Abi, ) -> <SchemaLayout as RefMutFromWasmAbi>::Anchor

Same as RefFromWasmAbi::ref_from_abi

impl TryFromJsValue for SchemaLayout

fn try_from_js_value(value: JsValue) -> Result<SchemaLayout, JsValue>

Performs the conversion.

fn try_from_js_value_ref(value: &JsValue) -> Option<SchemaLayout>

Performs the conversion.

impl VectorFromWasmAbi for SchemaLayout

type Abi = <Box<[JsValue]> as FromWasmAbi>::Abi

unsafe fn vector_from_abi( js: <SchemaLayout as VectorFromWasmAbi>::Abi, ) -> Box<[SchemaLayout]>

impl VectorIntoWasmAbi for SchemaLayout

type Abi = <Box<[JsValue]> as IntoWasmAbi>::Abi

fn vector_into_abi( vector: Box<[SchemaLayout]>, ) -> <SchemaLayout as VectorIntoWasmAbi>::Abi