Struct MutableUtf8Array

pub struct MutableUtf8Array<O: Offset> { /* private fields */ }

A MutableArray that builds a Utf8Array. It differs from MutableUtf8ValuesArray in that it can build nullable Utf8Arrays.

Implementations

impl<O: Offset> MutableUtf8Array<O>

pub fn new() -> Self

Initializes a new empty MutableUtf8Array.

pub fn try_new( dtype: ArrowDataType, offsets: Offsets<O>, values: Vec<u8>, validity: Option<MutableBitmap>, ) -> PolarsResult<Self>

Returns a MutableUtf8Array created from its internal representation.

Errors

This function returns an error iff:

• The last offset is not equal to the values’ length.
• the validity’s length is not equal to offsets.len().
• The dtype’s crate::datatypes::PhysicalType is not equal to either Utf8 or LargeUtf8.
• The values between two consecutive offsets are not valid utf8

Implementation

This function is O(N) - checking utf8 is O(N)

pub unsafe fn new_unchecked( dtype: ArrowDataType, offsets: Offsets<O>, values: Vec<u8>, validity: Option<MutableBitmap>, ) -> Self

Create a MutableUtf8Array out of low-end APIs.

Safety

The caller must ensure that every value between offsets is a valid utf8.

Panics

This function panics iff:

• The offsets and values are inconsistent
• The validity is not None and its length is different from offsets’s length minus one.

pub fn from<T: AsRef<str>, P: AsRef<[Option<T>]>>(slice: P) -> Self

Creates a new MutableUtf8Array from a slice of optional &[u8].

pub fn with_capacity(capacity: usize) -> Self

Initializes a new MutableUtf8Array with a pre-allocated capacity of slots.

pub fn with_capacities(capacity: usize, values: usize) -> Self

Initializes a new MutableUtf8Array with a pre-allocated capacity of slots and values.

pub fn reserve(&mut self, additional: usize, additional_values: usize)

Reserves additional elements and additional_values on the values buffer.

pub fn capacity(&self) -> usize

Reserves additional elements and additional_values on the values buffer.

pub fn len(&self) -> usize

Returns the length of this array

pub fn push<T: AsRef<str>>(&mut self, value: Option<T>)

Pushes a new element to the array.

Panic

This operation panics iff the length of all values (in bytes) exceeds O maximum value.

pub fn value(&self, i: usize) -> &str

Returns the value of the element at index i, ignoring the array’s validity.

pub unsafe fn value_unchecked(&self, i: usize) -> &str

Returns the value of the element at index i, ignoring the array’s validity.

Safety

This function is safe iff i < self.len.

pub fn pop(&mut self) -> Option<String>

Pop the last entry from MutableUtf8Array. This function returns None iff this array is empty.

pub fn iter( &self, ) -> ZipValidity<&str, ArrayValuesIter<'_, MutableUtf8ValuesArray<O>>, BitmapIter<'_>>

Returns an iterator of Option<&str>

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

Converts itself into an Array.

pub fn shrink_to_fit(&mut self)

Shrinks the capacity of the MutableUtf8Array to fit its current length.

pub fn into_data( self, ) -> (ArrowDataType, Offsets<O>, Vec<u8>, Option<MutableBitmap>)

Extract the low-end APIs from the MutableUtf8Array.

pub fn values_iter(&self) -> ArrayValuesIter<'_, MutableUtf8ValuesArray<O>>

Returns an iterator of &str

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

Sets the validity.

Panic

Panics iff the validity’s len is not equal to the existing values’ length.

pub fn apply_validity<F: FnOnce(MutableBitmap) -> MutableBitmap>( &mut self, f: F, )

Applies a function f to the validity of this array.

This is an API to leverage clone-on-write

Panics

This function panics if the function f modifies the length of the Bitmap.

impl<O: Offset> MutableUtf8Array<O>

pub fn values(&self) -> &Vec<u8>

returns its values.

pub fn offsets(&self) -> &Offsets<O>

returns its offsets.

impl<O: Offset> MutableUtf8Array<O>

pub fn extend_trusted_len_values<I, P>(&mut self, iterator: I)

where P: AsRef<str>, I: TrustedLen<Item = P>,

Extends the MutableUtf8Array from an iterator of values of trusted len. This differs from extended_trusted_len which accepts iterator of optional values.

pub fn extend_values<I, P>(&mut self, iterator: I)

where P: AsRef<str>, I: Iterator<Item = P>,

Extends the MutableUtf8Array from an iterator of values. This differs from extended_trusted_len which accepts iterator of optional values.

pub unsafe fn extend_trusted_len_values_unchecked<I, P>(&mut self, iterator: I)

where P: AsRef<str>, I: Iterator<Item = P>,

Extends the MutableUtf8Array from an iterator of values of trusted len. This differs from extended_trusted_len_unchecked which accepts iterator of optional values.

Safety

The iterator must be trusted len.

pub fn extend_trusted_len<I, P>(&mut self, iterator: I)

where P: AsRef<str>, I: TrustedLen<Item = Option<P>>,

Extends the MutableUtf8Array from an iterator of trusted len.

pub unsafe fn extend_trusted_len_unchecked<I, P>(&mut self, iterator: I)

where P: AsRef<str>, I: Iterator<Item = Option<P>>,

Extends MutableUtf8Array from an iterator of trusted len.

Safety

The iterator must be trusted len.

pub unsafe fn from_trusted_len_iter_unchecked<I, P>(iterator: I) -> Self

where P: AsRef<str>, I: Iterator<Item = Option<P>>,

Creates a MutableUtf8Array from an iterator of trusted length.

Safety

The iterator must be TrustedLen. I.e. that size_hint().1 correctly reports its length.

pub fn from_trusted_len_iter<I, P>(iterator: I) -> Self

where P: AsRef<str>, I: TrustedLen<Item = Option<P>>,

Creates a MutableUtf8Array from an iterator of trusted length.

pub unsafe fn from_trusted_len_values_iter_unchecked<T: AsRef<str>, I: Iterator<Item = T>>( iterator: I, ) -> Self

Creates a MutableUtf8Array from an iterator of trusted length of &str.

Safety

The iterator must be TrustedLen. I.e. that size_hint().1 correctly reports its length.

pub fn from_trusted_len_values_iter<T: AsRef<str>, I: TrustedLen<Item = T>>( iterator: I, ) -> Self

Creates a new MutableUtf8Array from a TrustedLen of &str.

pub unsafe fn try_from_trusted_len_iter_unchecked<E, I, P>( iterator: I, ) -> Result<Self, E>

where P: AsRef<str>, I: IntoIterator<Item = Result<Option<P>, E>>,

Creates a MutableUtf8Array from an falible iterator of trusted length.

Safety

The iterator must be TrustedLen. I.e. that size_hint().1 correctly reports its length.

pub fn try_from_trusted_len_iter<E, I, P>(iterator: I) -> Result<Self, E>

where P: AsRef<str>, I: TrustedLen<Item = Result<Option<P>, E>>,

Creates a MutableUtf8Array from an falible iterator of trusted length.

pub fn from_iter_values<T: AsRef<str>, I: Iterator<Item = T>>( iterator: I, ) -> Self

Creates a new MutableUtf8Array from a Iterator of &str.

pub fn extend_fallible<T, I, E>(&mut self, iter: I) -> Result<(), E>

where E: Error, I: IntoIterator<Item = Result<Option<T>, E>>, T: AsRef<str>,

Extend with a fallible iterator

Trait Implementations

impl<'a, O: Offset> ArrayAccessor<'a> for MutableUtf8Array<O>

type Item = &'a str

unsafe fn value_unchecked(&'a self, index: usize) -> Self::Item

Safety

fn len(&self) -> usize

impl<O: Clone + Offset> Clone for MutableUtf8Array<O>

fn clone(&self) -> MutableUtf8Array<O>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<O: Debug + Offset> Debug for MutableUtf8Array<O>

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

Formats the value using the given formatter.

impl<O: Offset> Default for MutableUtf8Array<O>

fn default() -> Self

Returns the “default value” for a type.

impl<O: Offset, T: AsRef<str>> Extend<Option<T>> for MutableUtf8Array<O>

fn extend<I: IntoIterator<Item = Option<T>>>(&mut self, iter: I)

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl<O: Offset> From<MutableUtf8Array<O>> for Utf8Array<O>

fn from(other: MutableUtf8Array<O>) -> Self

Converts to this type from the input type.

impl<O: Offset> From<MutableUtf8ValuesArray<O>> for MutableUtf8Array<O>

fn from(other: MutableUtf8ValuesArray<O>) -> Self

Converts to this type from the input type.

impl<O: Offset, P: AsRef<str>> FromIterator<Option<P>> for MutableUtf8Array<O>

fn from_iter<I: IntoIterator<Item = Option<P>>>(iter: I) -> Self

Creates a value from an iterator.

impl<'a, O: Offset> IntoIterator for &'a MutableUtf8Array<O>

type Item = Option<&'a str>

The type of the elements being iterated over.

type IntoIter = ZipValidity<&'a str, ArrayValuesIter<'a, MutableUtf8ValuesArray<O>>, BitmapIter<'a>>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<O: Offset> MutableArray for MutableUtf8Array<O>

fn len(&self) -> usize

The length of the array.

fn validity(&self) -> Option<&MutableBitmap>

The optional validity of the array.

fn as_box(&mut self) -> Box<dyn Array>

Convert itself to an (immutable) Array.

fn as_arc(&mut self) -> Arc<dyn Array>

Convert itself to an (immutable) atomically reference counted Array.

fn dtype(&self) -> &ArrowDataType

The ArrowDataType of the array.

fn as_any(&self) -> &dyn Any

Convert to Any, to enable dynamic casting.

fn as_mut_any(&mut self) -> &mut dyn Any

Convert to mutable Any, to enable dynamic casting.

fn push_null(&mut self)

Adds a new null element to the array.

fn reserve(&mut self, additional: usize)

Reserves additional slots to its capacity.

fn shrink_to_fit(&mut self)

Shrink the array to fit its length.

fn is_empty(&self) -> bool

Whether the array is empty.

fn is_valid(&self, index: usize) -> bool

Whether index is valid / set.

impl<O: Offset> PartialEq for MutableUtf8Array<O>

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<O: Offset, T: AsRef<str>> TryExtend<Option<T>> for MutableUtf8Array<O>

fn try_extend<I: IntoIterator<Item = Option<T>>>( &mut self, iter: I, ) -> PolarsResult<()>

Fallible version of Extend::extend.

impl<O: Offset> TryExtendFromSelf for MutableUtf8Array<O>

fn try_extend_from_self(&mut self, other: &Self) -> PolarsResult<()>

Tries to extend itself with elements from other, failing only on overflow.

impl<O: Offset, T: AsRef<str>> TryPush<Option<T>> for MutableUtf8Array<O>

fn try_push(&mut self, value: Option<T>) -> PolarsResult<()>

Tries to push a new element.