Struct SizeConstraint 

pub struct SizeConstraint { /* private fields */ }

A constraint that checks the size (row count) of the data.

This constraint validates that the total number of rows in the dataset meets the specified assertion criteria.

Examples

use term_guard::constraints::{SizeConstraint, Assertion};
use term_guard::core::Constraint;

// Check that we have exactly 1000 rows
let constraint = SizeConstraint::new(Assertion::Equals(1000.0));
assert_eq!(constraint.name(), "size");

// Check that we have at least 100 rows
let constraint = SizeConstraint::new(Assertion::GreaterThanOrEqual(100.0));

// Check that row count is between 1000 and 10000
let constraint = SizeConstraint::new(Assertion::Between(1000.0, 10000.0));

Implementations

impl SizeConstraint

pub fn new(assertion: Assertion) -> Self

Creates a new size constraint with the specified assertion.

Arguments

• assertion - The assertion to evaluate against the row count

Trait Implementations

impl Clone for SizeConstraint

fn clone(&self) -> SizeConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Constraint for SizeConstraint

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 metadata(&self) -> ConstraintMetadata

Returns the metadata associated with this constraint.

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

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

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

Returns a description of what this constraint validates.

impl Debug for SizeConstraint

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

Formats the value using the given formatter.