Expand description
Queryable — decoding a generic Value into a caller’s own type,
and the helpers #[derive(Queryable)] generates calls to.
Conventional in role rather than in mechanism: a client that decodes
straight off a binary wire format does so against a type descriptor, while
Pylon has already walked the compiled shape into a Value by the time
this runs, so this is a plain &Value -> Result<Self> conversion.
Fields match by name, not by shape position. A positional derive would
compare the struct’s field order against the shape’s pointer order and
reject a mismatch; a Pylon [Object] is name-keyed, so order is irrelevant
here. The bug a positional check catches is still caught: a struct field
the query never selected is a DecodeErrorKind::MissingField, not a
silently-wrong value.
Structs§
- Decode
Error - What went wrong, and where in the result it was.
Enums§
Traits§
- Queryable
- A type a query result can be decoded into — implemented for the scalars
Pylon returns, for
Option/Vecof those, and derivable for a row struct or a schema enum with#[derive(Queryable)].