Struct QueryMetadata 

pub struct QueryMetadata {
    pub columns: Vec<ColumnInfo>,
    pub total_rows: Option<u64>,
    pub plan_info: Option<PlanInfo>,
    pub performance: PerformanceMetrics,
    pub warnings: Vec<String>,
    pub access_path: Option<AccessPath>,
}

Metadata for query results

Fields

columns: Vec<ColumnInfo>

Column information

total_rows: Option<u64>

Total row count (may be different from returned rows due to LIMIT)

plan_info: Option<PlanInfo>

Query execution plan information

performance: PerformanceMetrics

Performance metrics

warnings: Vec<String>

Warnings generated during execution

access_path: Option<AccessPath>

Access path selected by the SSTable-scan step (Issue #960).

Some when a SELECT ran through the modern SelectExecutor (materializing or streaming); None for surfaces that do not yet report a path (e.g. the legacy executor and non-SELECT queries). This is the result-attached half of the access-path signal; the test-accessible probe is crate::query::access_path::last().

Trait Implementations

impl Clone for QueryMetadata

fn clone(&self) -> QueryMetadata

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryMetadata

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

Formats the value using the given formatter.

impl Default for QueryMetadata

fn default() -> QueryMetadata

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for QueryMetadata

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for QueryMetadata

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

where __S: Serializer,

Serialize this value into the given Serde serializer.