Struct JoinKey 

pub struct JoinKey {
    pub left_field: FieldId,
    pub right_field: FieldId,
    pub null_equals_null: bool,
}

Join key pair describing which columns to equate.

Fields

left_field: FieldId

Field ID from the left table.

right_field: FieldId

Field ID from the right table.

null_equals_null: bool

If true, NULL == NULL for this key (SQL-style NULL-safe equality). If false, NULL != NULL (Arrow default).

Implementations

impl JoinKey

pub fn new(left_field: FieldId, right_field: FieldId) -> Self

Create a join key with standard Arrow null semantics (NULL != NULL).

pub fn null_safe(left_field: FieldId, right_field: FieldId) -> Self

Create a join key with SQL-style NULL-safe equality (NULL == NULL).

Trait Implementations

impl Clone for JoinKey

fn clone(&self) -> JoinKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JoinKey

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

Formats the value using the given formatter.

impl PartialEq for JoinKey

fn eq(&self, other: &JoinKey) -> 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 Eq for JoinKey

impl StructuralPartialEq for JoinKey