Struct QueryMetadata 

pub struct QueryMetadata {
    pub schema: Arc<Schema>,
    pub total_rows: Option<i64>,
    pub column_count: usize,
    pub execution_time_ms: Option<u64>,
}

Metadata about a query execution.

Fields

schema: Arc<Schema>

Schema of the result set

total_rows: Option<i64>

Total number of rows (if known)

column_count: usize

Number of columns

execution_time_ms: Option<u64>

Execution time in milliseconds (if available)

Implementations

impl QueryMetadata

pub fn new(schema: Arc<Schema>, total_rows: Option<i64>) -> Self

Create metadata from schema and row count.

pub fn with_execution_time(self, execution_time_ms: u64) -> Self

Set execution time.

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

Get column names.

pub fn column_types(&self) -> Vec<&DataType>

Get column types.

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.