Struct ImplicitCoercion

pub struct ImplicitCoercion { /* private fields */ }

Defines rules for implicit type coercion, specifying which source types can be coerced and the default type to use when coercing.

This is used by functions to specify which types they can accept via implicit coercion in addition to their primary desired type.

Examples

use arrow::datatypes::TimeUnit;

use datafusion_expr_common::signature::{Coercion, ImplicitCoercion, TypeSignatureClass};
use datafusion_common::types::{NativeType, logical_binary};

// Allow coercing from binary types to timestamp, coerce to specific timestamp unit and timezone
let implicit = Coercion::new_implicit(
    TypeSignatureClass::Timestamp,
    vec![TypeSignatureClass::Native(logical_binary())],
    NativeType::Timestamp(TimeUnit::Second, None),
);

Trait Implementations

impl Clone for ImplicitCoercion

fn clone(&self) -> ImplicitCoercion

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ImplicitCoercion

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

Formats the value using the given formatter.

impl Display for ImplicitCoercion

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

Formats the value using the given formatter.

impl Hash for ImplicitCoercion

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ImplicitCoercion

fn eq(&self, other: &Self) -> 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 PartialOrd for ImplicitCoercion

fn partial_cmp(&self, other: &ImplicitCoercion) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for ImplicitCoercion