Struct Count 

pub struct Count {}

Trait Implementations

impl AggregatingFunction for Count

fn initialize_accumulator( &self, _context: &ExpressionEvaluationContext<'_>, _expression: &FunctionExpression, _grouping_keys: &Vec<VariableValue>, _index: Arc<dyn ResultIndex>, ) -> Accumulator

fn accumulator_is_lazy(&self) -> bool

fn apply<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _context: &'life1 ExpressionEvaluationContext<'_>, args: Vec<VariableValue>, accumulator: &'life2 mut Accumulator, ) -> Pin<Box<dyn Future<Output = Result<VariableValue, FunctionError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

fn revert<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _context: &'life1 ExpressionEvaluationContext<'_>, args: Vec<VariableValue>, accumulator: &'life2 mut Accumulator, ) -> Pin<Box<dyn Future<Output = Result<VariableValue, FunctionError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

fn snapshot<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _context: &'life1 ExpressionEvaluationContext<'_>, _args: Vec<VariableValue>, accumulator: &'life2 Accumulator, ) -> Pin<Box<dyn Future<Output = Result<VariableValue, FunctionError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

impl Debug for Count

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

Formats the value using the given formatter.