Struct Field

pub struct Field {
    ident: Ident,
    ty: Type,
    is_a_byte_buf: bool,
    third_party_type: Option<ThirdPartyType>,
}

Fields

ident: Ident

ty: Type

is_a_byte_buf: bool

third_party_type: Option<ThirdPartyType>

Implementations

impl Field

pub fn from(f: &Field) -> Self

pub fn writer_snippet(&self) -> TokenStream

Takes the parsed field of the struct and emits a valid column writer snippet. Should match exactly what you would write by hand.

Can only generate writers for basic structs, for example:

struct Record { a_bool: bool, maybe_a_bool: Option<bool> }

but not

struct UnsupportedNestedRecord { a_property: bool, nested_record: Record }

because this parsing logic is not sophisticated enough for definition levels beyond 2.

pub fn reader_snippet(&self) -> TokenStream

Takes the parsed field of the struct and emits a valid column reader snippet. Should match exactly what you would write by hand.

Can only generate writers for basic structs, for example:

struct Record { a_bool: bool }

but not

struct UnsupportedNestedRecord { a_property: bool, nested_record: Record }

because this parsing logic is not sophisticated enough for definition levels beyond 2.

Option types and references not supported, but the column itself can be nullable (i.e., def_level==1), as long as the values are all valid.

pub fn parquet_type(&self) -> TokenStream

fn option_into_vals(&self) -> TokenStream

fn copied_direct_vals(&self) -> TokenStream

fn copied_direct_fields(&self) -> TokenStream

fn optional_definition_levels(&self) -> TokenStream

Trait Implementations

impl Debug for Field

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

Formats the value using the given formatter.

impl PartialEq for Field

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Field