Struct MultiStatisticalConstraint 

pub struct MultiStatisticalConstraint { /* private fields */ }

A constraint that can compute multiple statistics in a single query for performance optimization.

This is useful when you need to validate multiple statistics on the same column, as it reduces the number of table scans required.

Examples

use term_guard::constraints::{MultiStatisticalConstraint, StatisticType, Assertion};

// Check multiple statistics on the same column in one pass
let multi_stats = MultiStatisticalConstraint::new(
    "response_time",
    vec![
        (StatisticType::Min, Assertion::GreaterThanOrEqual(0.0)),
        (StatisticType::Max, Assertion::LessThan(5000.0)),
        (StatisticType::Mean, Assertion::Between(100.0, 1000.0)),
        (StatisticType::Percentile(0.95), Assertion::LessThan(2000.0)),
    ]
)?;

Implementations

impl MultiStatisticalConstraint

pub fn new( column: impl Into<String>, statistics: Vec<(StatisticType, Assertion)>, ) -> Result<Self>

Creates a new multi-statistical constraint.

Arguments

• column - The column to compute statistics on
• statistics - A vector of (statistic_type, assertion) pairs to evaluate

Errors

Returns error if column name is invalid or if any percentile is out of range.

Trait Implementations

impl Clone for MultiStatisticalConstraint

fn clone(&self) -> MultiStatisticalConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Constraint for MultiStatisticalConstraint

fn evaluate<'life0, 'life1, 'async_trait>( &'life0 self, ctx: &'life1 SessionContext, ) -> Pin<Box<dyn Future<Output = Result<ConstraintResult>> + Send + 'async_trait>>

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

Evaluates the constraint against the data in the session context.

fn name(&self) -> &str

Returns the name of the constraint.

fn column(&self) -> Option<&str>

Returns the column this constraint operates on (if single-column).

fn metadata(&self) -> ConstraintMetadata

Returns the metadata associated with this constraint.

fn description(&self) -> Option<&str>

Returns a description of what this constraint validates.

impl Debug for MultiStatisticalConstraint

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

Formats the value using the given formatter.