Struct ColumnReference

pub struct ColumnReference { /* private fields */ }

Implementations

impl ColumnReference

pub fn new(columns: Vec<String>) -> Self

pub fn empty() -> Self

pub fn iter(&self) -> impl Iterator<Item = &str>

pub fn is_empty(&self) -> bool

pub fn contains(&self, column: &String) -> bool

Trait Implementations

impl Clone for ColumnReference

fn clone(&self) -> ColumnReference

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnReference

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

Formats the value using the given formatter.

impl Default for ColumnReference

fn default() -> Self

Returns the “default value” for a type.

impl Display for ColumnReference

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

Formats the value using the given formatter.

impl Hash for ColumnReference

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 ColumnReference

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 TryFrom<&str> for ColumnReference

Parses column references from a string into a vector of each individual column reference.

“foo” -> vec![“foo”] “(foo, bar)” -> vec![“foo”, “bar”] “(foo, bar” -> Err(The column reference “(foo,bar” is missing a closing parenthensis.)

Examples

use datafusion_table_providers::util::column_reference::ColumnReference;

let column_ref = ColumnReference::try_from("foo").expect("valid columns");
assert_eq!(column_ref.iter().collect::<Vec<_>>(), vec!["foo"]);

let column_ref = ColumnReference::try_from("(foo, bar)").expect("valid columns");
assert_eq!(column_ref.iter().collect::<Vec<_>>(), vec!["foo", "bar"]);

type Error = Error

The type returned in the event of a conversion error.

fn try_from(columns: &str) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for ColumnReference