Struct CollectionColumns 

pub struct CollectionColumns<T> { /* private fields */ }

Very basic ordered mapping, essentially a list of pairs.

Handles logic common to SyntaxShape::Record, SyntaxShape::Table, [Type::Record], [Type::Table], and possibly any other ordered mapping.

Implements Display for T: Display:

let cols = CollectionColumns::from(vec![
    ("a".to_string(), 1),
    ("b".to_string(), 2),
]);
assert_eq!(cols.to_string(), "<a: 1, b: 2>");

Type widening (union) for [Type]:

let foo = CollectionColumns::from(vec![
    ("a".to_string(), Type::Int),
    ("b".to_string(), Type::String),
]);
let bar = CollectionColumns::from(vec![
    ("a".to_string(), Type::Float),
    ("b".to_string(), Type::Int),
    ("c".to_string(), Type::Date),
]);
assert_eq!(
    foo.union(bar),
    CollectionColumns::from(vec![
        ("a".to_string(), Type::Number),
        ("b".to_string(), Type::one_of([Type::String, Type::Int])),
    ])
);

Implementations

impl<T> CollectionColumns<T>

pub fn map<U>(&self, f: impl Fn(&T) -> U) -> CollectionColumns<U>

pub fn iter(&self) -> impl Iterator<Item = &(String, T)>

pub fn is_empty(&self) -> bool

pub fn len(&self) -> usize

impl<T> CollectionColumns<T>

pub fn new(fields: Box<[(String, T)]>) -> Self

pub fn get<'s>(&'s self, key: &str) -> Option<&'s T>

Trait Implementations

impl<T: Clone> Clone for CollectionColumns<T>

fn clone(&self) -> CollectionColumns<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> CompareTypes for CollectionColumns<T>

where T: CompareTypes,

fn is_any(&self) -> bool

Our type system uses the empty record as both the bottom and the top type of records

fn compare_types(&self, other: &Self) -> Option<TypeRelation>

Compares types and returns their relation with regards to subtyping.

fn is_assignable_to(&self, dst: &Self) -> bool

Equivalent to CompareTypes::is_subtype_of by default.

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

Returns true if self is equal to or is a strict subtype of other

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

Returns true if self is equal to or is a strict supertype of other

impl CompareTypes<CollectionColumns<Type>> for Record

fn compare_types(&self, other: &CollectionColumns<Type>) -> Option<TypeRelation>

Compares types and returns their relation with regards to subtyping.

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

Returns true if self is equal to or is a strict subtype of other

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

Returns true if self is equal to or is a strict supertype of other

fn is_any(&self) -> bool

Allows having an “escape hatch”.

fn is_assignable_to(&self, dst: &Rhs) -> bool

Equivalent to CompareTypes::is_subtype_of by default.

impl<T: Debug> Debug for CollectionColumns<T>

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

Formats the value using the given formatter.

impl<T> Default for CollectionColumns<T>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for CollectionColumns<T>

where T: Deserialize<'de>,

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Display for CollectionColumns<T>

where T: Display,

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

Formats the value using the given formatter.

impl<T: Eq> Eq for CollectionColumns<T>

impl<T> From<Box<[(String, T)]>> for CollectionColumns<T>

fn from(value: Box<[(String, T)]>) -> Self

Converts to this type from the input type.

impl<T> From<Vec<(String, T)>> for CollectionColumns<T>

fn from(value: Vec<(String, T)>) -> Self

Converts to this type from the input type.

impl<T> FromIterator<(String, T)> for CollectionColumns<T>

fn from_iter<I: IntoIterator<Item = (String, T)>>(iter: I) -> Self

Creates a value from an iterator.

impl<T: Hash> Hash for CollectionColumns<T>

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<T> IntoIterator for CollectionColumns<T>

type Item = (String, T)

The type of the elements being iterated over.

type IntoIter = IntoIter<<CollectionColumns<T> as IntoIterator>::Item>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a, T> IntoIterator for &'a CollectionColumns<T>

type Item = &'a (String, T)

The type of the elements being iterated over.

type IntoIter = Iter<'a, (String, T)>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<T: Ord> Ord for CollectionColumns<T>

fn cmp(&self, other: &CollectionColumns<T>) -> 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<T: PartialEq> PartialEq for CollectionColumns<T>

fn eq(&self, other: &CollectionColumns<T>) -> 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<T: PartialOrd> PartialOrd for CollectionColumns<T>

fn partial_cmp(&self, other: &CollectionColumns<T>) -> 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<T> Serialize for CollectionColumns<T>

where T: Serialize,

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T: PartialEq> StructuralPartialEq for CollectionColumns<T>

impl<T> TypeSet for CollectionColumns<T>

where T: TypeSet + Clone,

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

Returns the narrowest common supertype of the given types.