Struct QueryRuntimeBuilder 

pub struct QueryRuntimeBuilder<T: Tracer = NoopTracer> { /* private fields */ }

Builder for QueryRuntime with customizable settings.

Example

let runtime = QueryRuntime::builder()
    .error_comparator(|a, b| {
        // Treat all errors of the same type as equal
        a.downcast_ref::<std::io::Error>().is_some()
            == b.downcast_ref::<std::io::Error>().is_some()
    })
    .build();

Implementations

impl QueryRuntimeBuilder<NoopTracer>

pub fn new() -> Self

Create a new builder with default settings.

impl<T: Tracer> QueryRuntimeBuilder<T>

pub fn error_comparator(self, f: ErrorComparator) -> Self

Set the error comparator function for early cutoff optimization.

When a query returns QueryError::UserError, this function is used to compare it with the previously cached error. If they are equal, downstream queries can skip recomputation (early cutoff).

The default comparator returns false for all errors, meaning errors are always considered different (conservative, always recomputes).

Example

// Treat errors as equal if they have the same display message
let runtime = QueryRuntime::builder()
    .error_comparator(|a, b| a.to_string() == b.to_string())
    .build();

pub fn tracer<U: Tracer>(self, tracer: U) -> QueryRuntimeBuilder<U>

Set the tracer for observability.

pub fn build(self) -> QueryRuntime<T>

Build the runtime with the configured settings.

Trait Implementations

impl Default for QueryRuntimeBuilder<NoopTracer>

fn default() -> Self

Returns the “default value” for a type.