Struct datafusion::prelude::Column

pub struct Column {
    pub relation: Option<String>,
    pub name: String,
}

A named reference to a qualified field in a schema.

Fields

relation: Option<String>

relation/table name.

name: String

field/column name.

Implementations

impl Column

pub fn new(
    relation: Option<impl Into<String>>,
    name: impl Into<String>
) -> Column

Create Column from optional qualifier and name

pub fn from_name(name: impl Into<String>) -> Column

Create Column from unqualified name.

pub fn from_qualified_name(flat_name: &str) -> Column

Deserialize a fully qualified name string into a column

pub fn flat_name(&self) -> String

Serialize column into a flat name string

pub fn normalize_with_schemas(
    self,
    schemas: &[&Arc<DFSchema>],
    using_columns: &[HashSet<Column, RandomState>]
) -> Result<Column, DataFusionError>

Trait Implementations

impl Clone for Column

fn clone(&self) -> Column

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Column

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

Formats the value using the given formatter.

impl Display for Column

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

Formats the value using the given formatter.

impl From<&str> for Column

fn from(c: &str) -> Column

Converts to this type from the input type.

impl FromStr for Column

type Err = Infallible

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Column, <Column as FromStr>::Err>

Parses a string s to return a value of this type.

impl Hash for Column

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

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 Ord for Column

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl PartialEq<Column> for Column

fn eq(&self, other: &Column) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd<Column> for Column

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Eq for Column

impl StructuralEq for Column

impl StructuralPartialEq for Column