Struct mz_sql::plan::typeconv::CastTemplate

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struct CastTemplate(Box<dyn Fn(&ExprContext<'_>, CastContext, &ScalarType, &ScalarType) -> Option<Box<dyn FnOnce(HirScalarExpr) -> HirScalarExpr>> + Send + Sync>);
Expand description

A cast template is a function that produces a Cast given a concrete input and output type. A template can return None to indicate that it is incapable of producing a cast for the specified types.

Cast templates are used to share code for similar casts, where the input or output type is of one “category” of type. For example, a single cast template handles converting from strings to any list type. Without cast templates, we’d have to enumerate every possible list -> list conversion, which is impractical.

Tuple Fields§

§0: Box<dyn Fn(&ExprContext<'_>, CastContext, &ScalarType, &ScalarType) -> Option<Box<dyn FnOnce(HirScalarExpr) -> HirScalarExpr>> + Send + Sync>

Implementations§

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impl CastTemplate

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fn new<T, C>(t: T) -> CastTemplate
where T: Fn(&ExprContext<'_>, CastContext, &ScalarType, &ScalarType) -> Option<C> + Send + Sync + 'static, C: FnOnce(HirScalarExpr) -> HirScalarExpr + 'static,

Trait Implementations§

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impl<const N: usize> From<[UnaryFunc; N]> for CastTemplate

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fn from(funcs: [UnaryFunc; N]) -> CastTemplate

Converts to this type from the input type.
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impl From<UnaryFunc> for CastTemplate

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fn from(u: UnaryFunc) -> CastTemplate

Converts to this type from the input type.

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Performs the cast.
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