Struct ExecutionProps 

pub struct ExecutionProps {
    pub query_execution_start_time: Option<DateTime<Utc>>,
    pub alias_generator: Arc<AliasGenerator>,
    pub config_options: Option<Arc<ConfigOptions>>,
    pub var_providers: Option<HashMap<VarType, Arc<dyn VarProvider + Send + Sync>>>,
    pub subquery_indexes: HashMap<Subquery, SubqueryIndex>,
    pub subquery_results: ScalarSubqueryResults,
    pub lambda_variable_qualifier: HashMap<String, TableReference>,
}

Holds properties and scratch state used while optimizing a LogicalPlan and translating it into an executable physical plan, such as the statement start time used during simplification.

An ExecutionProps 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

Relationship with TaskContext

ExecutionProps is intentionally distinct from TaskContext. It is used while optimizing a logical plan and constructing physical expressions and physical plans, before physical operators are run.

TaskContext is the runtime context passed to physical operators during physical-plan execution.

Keeping these structures separate avoids threading execution/runtime state through planning APIs, and avoids making execution depend on planner-only scratch state.

Fields

query_execution_start_time: Option<DateTime<Utc>>

The time at which the query execution started. If None, functions like now() will not be simplified during optimization.

alias_generator: Arc<AliasGenerator>

Alias generator used by subquery optimizer rules

config_options: Option<Arc<ConfigOptions>>

Snapshot of config options when the query started

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

Providers for scalar variables

subquery_indexes: HashMap<Subquery, SubqueryIndex>

Maps each logical Subquery to its index in subquery_results. Populated by the physical planner before calling create_physical_expr.

subquery_results: ScalarSubqueryResults

Shared results container for uncorrelated scalar subquery values. Populated at execution time by ScalarSubqueryExec.

lambda_variable_qualifier: HashMap<String, TableReference>

Maps each lambda variable name to its lambda qualifier generated during physical planning. Populated by the physical planner for each lambda before calling create_physical_expr.

Implementations

impl ExecutionProps

pub fn new() -> Self

Creates a new execution props

pub fn with_query_execution_start_time( self, query_execution_start_time: DateTime<Utc>, ) -> Self

Set the query execution start time to use

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

👎Deprecated since 50.0.0:

Use mark_start_execution instead

pub fn mark_start_execution( &mut self, config_options: Arc<ConfigOptions>, ) -> &Self

Marks the execution of query started timestamp. This also instantiates a new alias generator.

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

pub fn config_options(&self) -> Option<&Arc<ConfigOptions>>

Returns the configuration properties for this execution if the execution has started

pub fn with_qualified_lambda_variables( self, qualifier: &TableReference, variables: &[String], ) -> Self

Adds a mapping for each variable to the given qualifier. Existing variables with conflicting names get’s shadowed

Trait Implementations

impl Clone for ExecutionProps

fn clone(&self) -> ExecutionProps

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExecutionProps

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

Formats the value using the given formatter.

impl Default for ExecutionProps

fn default() -> Self

Returns the “default value” for a type.