Struct DeclaredOnly 

pub struct DeclaredOnly {
    pub keyword: &'static str,
    pub note: &'static str,
}

What a declaring-but-not-enforcing engine says about its own constraints.

Fields

keyword: &'static str

The engine’s own words, appended to every key constraint it renders — BigQuery’s " NOT ENFORCED", leading space included, because the suffix is concatenated onto the constraint text.

"" where the engine has no such keyword. That is not a lesser answer: it is the honest one for Redshift, and it is what routes the fact into ConstraintEnforcement::ddl_note instead.

note: &'static str

One sentence saying what this engine does with a declared constraint, written for whoever is reading the rendered DDL.

Say what is and is not guaranteed, and where the guarantee has to come from instead — a reader who learns only “not enforced” still does not know whether their data is safe. It is rendered inside a SQL comment, so keep it to prose and never spell a statement.

Required even when keyword is non-empty: the docs read it in both cases, and only the DDL note is skipped where the keyword already speaks.

Trait Implementations

impl Clone for DeclaredOnly

fn clone(&self) -> DeclaredOnly

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DeclaredOnly

impl Debug for DeclaredOnly

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

Formats the value using the given formatter.

impl Eq for DeclaredOnly

impl PartialEq for DeclaredOnly

fn eq(&self, other: &DeclaredOnly) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for DeclaredOnly