Struct InMemoryTable 

pub struct InMemoryTable {
    pub columns: Vec<ColumnSchema>,
    pub rows: Vec<Vec<ColumnValue>>,
    pub name: Option<String>,
}

A columnar in-memory table.

Data is stored in row-major form (Vec<Vec<ColumnValue>>) to simplify row operations like filtering and joining, while still supporting column projection.

Fields

columns: Vec<ColumnSchema>

Column schemas (ordered)

rows: Vec<Vec<ColumnValue>>

Row data: each row is Vec<ColumnValue> with one entry per column

name: Option<String>

Optional table name

Implementations

impl InMemoryTable

pub fn new(columns: Vec<(String, ColumnType)>) -> Self

Create a new empty table with the given column name/type pairs.

pub fn with_name(self, name: impl Into<String>) -> Self

Set the table name.

pub fn row_count(&self) -> usize

Return the number of rows.

pub fn column_count(&self) -> usize

Return the number of columns.

pub fn column_index(&self, name: &str) -> Option<usize>

Return column index by name.

pub fn push_row(&mut self, row: &[ColumnValue]) -> Result<()>

Add a row. Returns an error if the row length doesn’t match the schema.

pub fn push_row_map(&mut self, map: HashMap<String, ColumnValue>) -> Result<()>

Add a row from a map. Missing columns get NULL.

pub fn get(&self, row: usize, col: usize) -> Option<&ColumnValue>

Get a cell value.

pub fn get_column(&self, name: &str) -> Option<Vec<&ColumnValue>>

Get a column as a slice of values.

pub fn row_as_map(&self, row_idx: usize) -> Option<HashMap<String, ColumnValue>>

Return a row as a HashMap.

pub fn to_json_rows(&self) -> Vec<Value>

Return rows as a Vec of JSON objects.

pub fn append(&mut self, other: &InMemoryTable) -> Result<()>

Append all rows from another table (must have compatible schemas).

Trait Implementations

impl Clone for InMemoryTable

fn clone(&self) -> InMemoryTable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InMemoryTable

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

Formats the value using the given formatter.

impl Default for InMemoryTable

fn default() -> InMemoryTable

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for InMemoryTable

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for InMemoryTable

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

where __S: Serializer,

Serialize this value into the given Serde serializer.