Struct WithOrdinality

struct WithOrdinality {
    inner: Box<TableFunc>,
}

Evaluates the inner table function, expands its results into unary (repeating each row as many times as the diff indicates), and appends an integer corresponding to the ordinal position (starting from 1). For example, it numbers the elements of a list when calling unnest_list.

Private enum variant of TableFunc. Don’t construct this directly, but use TableFunc::with_ordinality instead.

Fields

inner: Box<TableFunc>

Implementations

impl WithOrdinality

fn eval<'a>( &'a self, datums: &'a [Datum<'a>], temp_storage: &'a RowArena, ) -> Result<Box<dyn Iterator<Item = (Row, Diff)> + 'a>, EvalError>

Executes the self.inner table function on the given input row (datums), and zips 1, 2, 3, … to the result as a new column. We need to expand rows with non-1 diffs into the corresponding number of rows with unit diffs, because the ordinality column will have different values for each copy.

Panics

Panics if the inner table function emits a negative diff.

Trait Implementations

impl Clone for WithOrdinality

fn clone(&self) -> WithOrdinality

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WithOrdinality

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for WithOrdinality

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for WithOrdinality

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 MzReflect for WithOrdinality

fn add_to_reflected_type_info(rti: &mut ReflectedTypeInfo)

Adds names and types of the fields of the struct or enum to rti.

impl Ord for WithOrdinality

fn cmp(&self, other: &WithOrdinality) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for WithOrdinality

fn eq(&self, other: &WithOrdinality) -> 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 WithOrdinality

fn partial_cmp(&self, other: &WithOrdinality) -> 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 Serialize for WithOrdinality

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for WithOrdinality

impl StructuralPartialEq for WithOrdinality