Struct datafusion::execution::context::ExecutionProps

pub struct ExecutionProps {
    pub var_providers: Option<HashMap<VarType, Arc<dyn VarProvider + Send + Sync>>>,
    /* private fields */
}

Holds per-execution properties and data (such as starting timestamps, etc). An instance of this struct is created each time a LogicalPlan is prepared for execution (optimized). If the same plan is optimized multiple times, a new ExecutionProps is created each time.

It is important that this structure be cheap to create as it is done so during predicate pruning and expression simplification

Fields

var_providers: Option<HashMap<VarType, Arc<dyn VarProvider + Send + Sync>>>

providers for scalar variables

Implementations

impl ExecutionProps

pub fn new() -> Self

Creates a new execution props

pub fn start_execution(&mut self) -> &Self

Marks the execution of query started timestamp

pub fn add_var_provider(
    &mut self,
    var_type: VarType,
    provider: Arc<dyn VarProvider + Send + Sync>
) -> Option<Arc<dyn VarProvider + Send + Sync>>

Registers a variable provider, returning the existing provider, if any

pub fn get_var_provider(
    &self,
    var_type: VarType
) -> Option<Arc<dyn VarProvider + Send + Sync>>

Returns the provider for the var_type, if any

Trait Implementations

impl Clone for ExecutionProps

fn clone(&self) -> ExecutionProps

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for ExecutionProps

fn default() -> Self

Returns the “default value” for a type.