Struct QueryRow 

pub struct QueryRow {
    pub values: HashMap<String, Value>,
    pub key: RowKey,
    pub metadata: RowMetadata,
    pub cell_metadata: Option<HashMap<String, CellWriteMetadata>>,
}

Individual row in query result

Fields

values: HashMap<String, Value>

Column values mapped by column name

key: RowKey

Original row key

metadata: RowMetadata

Row metadata

cell_metadata: Option<HashMap<String, CellWriteMetadata>>

Per-cell write metadata (Issue #691).

Populated only when ProjectionFlags::include_cell_metadata is true during query planning. None on the hot path — no allocation is performed unless metadata is explicitly requested.

Map key = column name; value = write timestamp + optional expiration. Columns absent from this map either had no individual cell header in the SSTable (e.g. partition-key columns) or were not decoded under the current flag setting.

Implementations

impl QueryRow

pub fn new(key: RowKey) -> Self

Create a new query row

pub fn with_values(key: RowKey, values: HashMap<String, Value>) -> Self

Create a row with values

pub fn from_map(values: HashMap<String, Value>) -> Self

Create a row from a column name → value map, using a synthetic empty key.

Convenience constructor used by CLI utilities that do not track a raw partition key. The key is set to an empty byte vector.

pub fn get(&self, column: &str) -> Option<&Value>

Get a value by column name

pub fn set(&mut self, column: String, value: Value)

Set a value for a column

pub fn column_names(&self) -> Vec<String>

Get all column names

pub fn key(&self) -> &RowKey

Get the row key

pub fn metadata(&self) -> &RowMetadata

Get row metadata

pub fn set_metadata(&mut self, metadata: RowMetadata)

Set row metadata

pub fn set_cell_metadata(&mut self, map: HashMap<String, CellWriteMetadata>)

Attach per-cell write metadata to this row.

Replaces any previously attached map. Intended to be called by the scan/build path when ProjectionFlags::include_cell_metadata is set.

pub fn insert_cell_metadata(&mut self, column: String, meta: CellWriteMetadata)

Insert a single column’s write metadata.

Initialises the map on first call; subsequent calls insert into the existing map. No-op when called on the hot path that never enables metadata (the caller guards on the flag).

pub fn get_cell_metadata(&self, column: &str) -> Option<&CellWriteMetadata>

Return the write metadata for column, if present.

pub fn to_json(&self) -> Value

Convert to JSON representation

Trait Implementations

impl Clone for QueryRow

fn clone(&self) -> QueryRow

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryRow

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for QueryRow

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for QueryRow

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

where __S: Serializer,

Serialize this value into the given Serde serializer.