Struct datafusion::physical_plan::expressions::Column

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pub struct Column { /* private fields */ }

Expand description

Represents the column at a given index in a RecordBatch

Implementations

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impl Column

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pub fn new(name: &str, index: usize) -> Column

Create a new column expression

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pub fn new_with_schema(
name: &str,
schema: &Schema
) -> Result<Column, DataFusionError>

Create a new column expression based on column name and schema

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pub fn name(&self) -> &str

Get the column name

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pub fn index(&self) -> usize

Get the column index

Trait Implementations

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impl Clone for Column

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fn clone(&self) -> Column

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from source. Read more

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impl Debug for Column

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

Formats the value using the given formatter. Read more

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impl Display for Column

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

Formats the value using the given formatter. Read more

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impl Hash for Column

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

Feeds this value into the given Hasher. Read more

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fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

Feeds a slice of this type into the given Hasher. Read more

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impl PartialEq<Column> for Column

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

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

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

This method tests for !=.

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impl PhysicalExpr for Column

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fn as_any(&self) -> &(dyn Any + 'static)

Return a reference to Any that can be used for downcasting

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fn data_type(&self, input_schema: &Schema) -> Result<DataType, DataFusionError>

Get the data type of this expression, given the schema of the input

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fn nullable(&self, input_schema: &Schema) -> Result<bool, DataFusionError>

Decide whehter this expression is nullable, given the schema of the input

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fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue, DataFusionError>

Evaluate the expression

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fn evaluate_selection(
 &self,
 batch: &RecordBatch,
 selection: &BooleanArray
) -> Result<ColumnarValue, DataFusionError>

Evaluate an expression against a RecordBatch after first applying a validity array Read more

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impl Eq for Column

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impl StructuralEq for Column

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impl StructuralPartialEq for Column

Auto Trait Implementations

impl RefUnwindSafe for Column

impl Send for Column

impl Sync for Column

impl Unpin for Column

impl UnwindSafe for Column

Blanket Implementations

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impl<T> Any for T where
T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CallHasher for T where
T: Hash + ?Sized,

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default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64 where
H: Hash + ?Sized,
B: BuildHasher,

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impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same<T> for T

type Output = T

Should always be Self

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impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

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impl<T> ToString for T where
T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more

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impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

impl<V, T> VZip<V> for T where
V: MultiLane<T>,

fn vzip(self) -> V

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Struct datafusion::physical_plan::expressions::Column

Implementations

impl Column

pub fn new(name: &str, index: usize) -> Column

pub fn new_with_schema( name: &str, schema: &Schema) -> Result<Column, DataFusionError>

pub fn name(&self) -> &str

pub fn index(&self) -> usize

Trait Implementations

impl Clone for Column

fn clone(&self) -> Column

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

impl Debug for Column

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

impl Display for Column

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

impl Hash for Column

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

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher,

impl PartialEq<Column> for Column

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

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

impl PhysicalExpr for Column

fn as_any(&self) -> &(dyn Any + 'static)

fn data_type(&self, input_schema: &Schema) -> Result<DataType, DataFusionError>

fn nullable(&self, input_schema: &Schema) -> Result<bool, DataFusionError>

fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue, DataFusionError>

fn evaluate_selection( &self, batch: &RecordBatch, selection: &BooleanArray) -> Result<ColumnarValue, DataFusionError>

impl Eq for Column

impl StructuralEq for Column

impl StructuralPartialEq for Column

Auto Trait Implementations

impl RefUnwindSafe for Column

impl Send for Column

impl Sync for Column

impl Unpin for Column

impl UnwindSafe for Column

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> CallHasher for T where T: Hash + ?Sized,

default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64 where H: Hash + ?Sized, B: BuildHasher,

impl<Q, K> Equivalent<K> for Q where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

fn equivalent(&self, key: &K) -> bool

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

fn into(self) -> U

impl<T> Same<T> for T

type Output = T

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

impl<T> ToString for T where T: Display + ?Sized,

default fn to_string(&self) -> String

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<V, T> VZip<V> for T where V: MultiLane<T>,

fn vzip(self) -> V

impl<T> Allocation for T where T: RefUnwindSafe + Send + Sync,

pub fn new_with_schema(
name: &str,
schema: &Schema
) -> Result<Column, DataFusionError>

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

fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,

fn evaluate_selection(
&self,
batch: &RecordBatch,
selection: &BooleanArray
) -> Result<ColumnarValue, DataFusionError>

impl<T> Any for T where
T: 'static + ?Sized,

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T> CallHasher for T where
T: Hash + ?Sized,

default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64 where
H: Hash + ?Sized,
B: BuildHasher,

impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<T> ToOwned for T where
T: Clone,

impl<T> ToString for T where
T: Display + ?Sized,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

impl<V, T> VZip<V> for T where
V: MultiLane<T>,

impl<T> Allocation for T where
T: RefUnwindSafe + Send + Sync,