Module field_ext 

Field extension methods — the predicate-builder surface on Field<T, V>.

Each method returns a BasicPredicate<T>. The methods are organised by the trait bounds they require on V: PartialEq for equality, PartialOrd for ordering, and string-specific methods for Field<T, String>. Special methods exist for Option<U> fields (is_null / is_not_null).

Each method also captures the operand value into the constructed FieldPredicate, type-erased as Arc<dyn Any + Send + Sync>, so downstream walkers (SQL emitters, debug formatters) can downcast and inspect. Layout per op is documented on LookupOp.

Case-insensitive string ops use ASCII-only case folding rather than a regex engine or Unicode locale folding. This keeps in-memory predicates portable across runtimes and lets downstream SQL emitters mirror the same contract exactly.

Structs

PresentField

View of an optional field that only compares the present inner value.