Struct polars::prelude::StructArray

pub struct StructArray { /* private fields */ }
Available on crate feature polars-io only.
Expand description

A StructArray is a nested [Array] with an optional validity representing multiple [Array] with the same number of rows.

§Example

use polars_arrow::array::*;
use polars_arrow::datatypes::*;
let boolean = BooleanArray::from_slice(&[false, false, true, true]).boxed();
let int = Int32Array::from_slice(&[42, 28, 19, 31]).boxed();

let fields = vec![
    Field::new("b", ArrowDataType::Boolean, false),
    Field::new("c", ArrowDataType::Int32, false),
];

let array = StructArray::new(ArrowDataType::Struct(fields), vec![boolean, int], None);

Implementations§

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impl<'a> StructArray

pub fn iter( &'a self ) -> ZipValidity<Vec<Box<dyn Scalar>>, StructValueIter<'a>, BitmapIter<'a>>

Returns an iterator of Option<Box<dyn Array>>

pub fn values_iter(&'a self) -> StructValueIter<'a>

Returns an iterator of Box<dyn Array>

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impl StructArray

pub fn try_new( data_type: ArrowDataType, values: Vec<Box<dyn Array>>, validity: Option<Bitmap> ) -> Result<StructArray, PolarsError>

Returns a new StructArray.

§Errors

This function errors iff:

  • data_type’s physical type is not [crate::datatypes::PhysicalType::Struct].
  • the children of data_type are empty
  • the values’s len is different from children’s length
  • any of the values’s data type is different from its corresponding children’ data type
  • any element of values has a different length than the first element
  • the validity’s length is not equal to the length of the first element

pub fn new( data_type: ArrowDataType, values: Vec<Box<dyn Array>>, validity: Option<Bitmap> ) -> StructArray

Returns a new StructArray

§Panics

This function panics iff:

  • data_type’s physical type is not [crate::datatypes::PhysicalType::Struct].
  • the children of data_type are empty
  • the values’s len is different from children’s length
  • any of the values’s data type is different from its corresponding children’ data type
  • any element of values has a different length than the first element
  • the validity’s length is not equal to the length of the first element

pub fn new_empty(data_type: ArrowDataType) -> StructArray

Creates an empty StructArray.

pub fn new_null(data_type: ArrowDataType, length: usize) -> StructArray

Creates a null StructArray of length length.

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impl StructArray

pub fn into_data(self) -> (Vec<Field>, Vec<Box<dyn Array>>, Option<Bitmap>)

Deconstructs the StructArray into its individual components.

pub fn slice(&mut self, offset: usize, length: usize)

Slices this StructArray.

§Panics
  • offset + length must be smaller than self.len().
§Implementation

This operation is O(F) where F is the number of fields.

pub unsafe fn slice_unchecked(&mut self, offset: usize, length: usize)

Slices this StructArray.

§Implementation

This operation is O(F) where F is the number of fields.

§Safety

The caller must ensure that offset + length <= self.len().

pub fn sliced(self, offset: usize, length: usize) -> StructArray

Returns this array sliced.

§Implementation

This function is O(1).

§Panics

iff offset + length > self.len().

pub unsafe fn sliced_unchecked( self, offset: usize, length: usize ) -> StructArray

Returns this array sliced.

§Implementation

This function is O(1).

§Safety

The caller must ensure that offset + length <= self.len().

pub fn with_validity(self, validity: Option<Bitmap>) -> StructArray

Returns this array with a new validity.

§Panic

Panics iff validity.len() != self.len().

pub fn set_validity(&mut self, validity: Option<Bitmap>)

Sets the validity of this array.

§Panics

This function panics iff values.len() != self.len().

pub fn take_validity(&mut self) -> Option<Bitmap>

Takes the validity of this array, leaving it without a validity mask.

pub fn boxed(self) -> Box<dyn Array>

Boxes this array into a Box<dyn Array>.

pub fn arced(self) -> Arc<dyn Array>

Arcs this array into a std::sync::Arc<dyn Array>.

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impl StructArray

pub fn validity(&self) -> Option<&Bitmap>

The optional validity.

pub fn values(&self) -> &[Box<dyn Array>]

Returns the values of this StructArray.

pub fn fields(&self) -> &[Field]

Returns the fields of this StructArray.

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impl StructArray

pub fn get_fields(data_type: &ArrowDataType) -> &[Field]

Returns the fields the DataType::Struct.

Trait Implementations§

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impl Array for StructArray

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

Converts itself to a reference of Any, which enables downcasting to concrete types.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Converts itself to a mutable reference of Any, which enables mutable downcasting to concrete types.
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fn len(&self) -> usize

The length of the [Array]. Every array has a length corresponding to the number of elements (slots).
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fn data_type(&self) -> &ArrowDataType

The ArrowDataType of the [Array]. In combination with [Array::as_any], this can be used to downcast trait objects (dyn Array) to concrete arrays.
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fn slice(&mut self, offset: usize, length: usize)

Slices this [Array]. Read more
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unsafe fn slice_unchecked(&mut self, offset: usize, length: usize)

Slices the [Array]. Read more
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fn to_boxed(&self) -> Box<dyn Array>

Clone a &dyn Array to an owned Box<dyn Array>.
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fn validity(&self) -> Option<&Bitmap>

The validity of the [Array]: every array has an optional [Bitmap] that, when available specifies whether the array slot is valid or not (null). When the validity is None, all slots are valid.
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fn with_validity(&self, validity: Option<Bitmap>) -> Box<dyn Array>

Clones this [Array] with a new new assigned bitmap. Read more
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fn is_empty(&self) -> bool

whether the array is empty
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fn null_count(&self) -> usize

The number of null slots on this [Array]. Read more
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fn is_null(&self, i: usize) -> bool

Returns whether slot i is null. Read more
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unsafe fn is_null_unchecked(&self, i: usize) -> bool

Returns whether slot i is null. Read more
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fn is_valid(&self, i: usize) -> bool

Returns whether slot i is valid. Read more
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fn sliced(&self, offset: usize, length: usize) -> Box<dyn Array>

Returns a slice of this [Array]. Read more
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unsafe fn sliced_unchecked( &self, offset: usize, length: usize ) -> Box<dyn Array>

Returns a slice of this [Array]. Read more
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impl Clone for StructArray

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fn clone(&self) -> StructArray

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for StructArray

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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<'a> From<GrowableStruct<'a>> for StructArray

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fn from(val: GrowableStruct<'a>) -> StructArray

Converts to this type from the input type.
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impl From<MutableStructArray> for StructArray

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fn from(other: MutableStructArray) -> StructArray

Converts to this type from the input type.
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impl<'a> IntoIterator for &'a StructArray

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type Item = Option<Vec<Box<dyn Scalar>>>

The type of the elements being iterated over.
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type IntoIter = ZipValidity<Vec<Box<dyn Scalar>>, StructValueIter<'a>, BitmapIter<'a>>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <&'a StructArray as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl PartialEq<&(dyn Array + 'static)> for StructArray

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fn eq(&self, other: &&(dyn Array + 'static)) -> bool

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

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

This method tests for self and other values to be equal, and is used by ==.
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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.
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impl TryFrom<StructArray> for DataFrame

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type Error = PolarsError

The type returned in the event of a conversion error.
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fn try_from(arr: StructArray) -> Result<DataFrame, PolarsError>

Performs the conversion.

Auto Trait Implementations§

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,

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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,

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

Mutably borrows from an owned value. Read more
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impl<T> DynClone for T
where T: Clone,

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fn __clone_box(&self, _: Private) -> *mut ()

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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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> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<A> PolarsArray for A
where A: Array + ?Sized,

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fn has_validity(&self) -> bool

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impl<T> SlicedArray for T
where T: Array + Clone,

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fn slice_typed(&self, offset: usize, length: usize) -> T

Slices this [Array]. Read more
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unsafe fn slice_typed_unchecked(&self, offset: usize, length: usize) -> T

Slices the [Array]. Read more
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impl<T> ToOwned for T
where T: Clone,

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

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V