Struct QueryMetrics 

pub struct QueryMetrics {
    pub parse_time: Duration,
    pub plan_time: Duration,
    pub exec_time: Duration,
    pub total_time: Duration,
    pub rows_returned: usize,
    pub rows_scanned: usize,
    pub bytes_read: usize,
    pub plan_cache_hit: bool,
    pub l0_reads: usize,
    pub storage_reads: usize,
    pub cache_hits: usize,
}

Timing metrics collected during query execution.

All durations default to zero until the execution pipeline populates them.

Fields

parse_time: Duration

Time spent parsing the query string into an AST.

plan_time: Duration

Time spent planning (logical plan generation).

exec_time: Duration

Time spent executing the plan.

total_time: Duration

Wall-clock time from query submission to result.

rows_returned: usize

Number of rows returned to the caller.

rows_scanned: usize

Number of rows scanned during execution (0 until executor instrumentation).

bytes_read: usize

Number of bytes read from storage (0 until storage instrumentation).

plan_cache_hit: bool

Whether the plan was served from cache.

l0_reads: usize

Number of L0 reads during execution (0 until storage instrumentation).

storage_reads: usize

Number of storage reads during execution (0 until storage instrumentation).

cache_hits: usize

Number of cache hits during execution (0 until storage instrumentation).

Trait Implementations

impl Clone for QueryMetrics

fn clone(&self) -> QueryMetrics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryMetrics

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

Formats the value using the given formatter.

impl Default for QueryMetrics

fn default() -> QueryMetrics

Returns the “default value” for a type.