Enum datafusion::logical_expr::field_util::GetFieldAccessSchema

source · 
pub enum GetFieldAccessSchema {
    NamedStructField {
        name: ScalarValue,
    },
    ListIndex {
        key_dt: DataType,
    },
    ListRange {
        start_dt: DataType,
        stop_dt: DataType,
        stride_dt: DataType,
    },
}
Expand description

Types of the field access expression of a nested type, such as Field or List

Variants§

§

NamedStructField

Named field, For example struct["name"]

Fields

§name: ScalarValue
§

ListIndex

Single list index, for example: list[i]

Fields

§key_dt: DataType
§

ListRange

List stride, for example list[i:j:k]

Fields

§start_dt: DataType
§stop_dt: DataType
§stride_dt: DataType

Implementations§

source§

impl GetFieldAccessSchema

source

pub fn get_accessed_field( &self, data_type: &DataType ) -> Result<Field, DataFusionError>

Returns the schema Field from a DataType::List or DataType::Struct indexed by this structure

§Error

Errors if

  • the data_type is not a Struct or a List,
  • the data_type of the name/index/start-stop do not match a supported index type

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> IntoEither for T

source§

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

impl<T> Same for T

§

type Output = T

Should always be Self
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
source§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

source§

fn vzip(self) -> V