[−][src]Struct arrow::array::ListBuilder
Array builder for ListArray
Implementations
impl<T: ArrayBuilder> ListBuilder<T>
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pub fn new(values_builder: T) -> Self
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Creates a new ListArrayBuilder
from a given values array builder
pub fn with_capacity(values_builder: T, capacity: usize) -> Self
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Creates a new ListArrayBuilder
from a given values array builder
capacity
is the number of items to pre-allocate space for in this builder
impl<T: ArrayBuilder> ListBuilder<T> where
T: 'static,
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T: 'static,
pub fn values(&mut self) -> &mut T
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Returns the child array builder as a mutable reference.
This mutable reference can be used to append values into the child array builder,
but you must call append
to delimit each distinct list value.
pub fn append(&mut self, is_valid: bool) -> Result<()>
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Finish the current variable-length list array slot
pub fn finish(&mut self) -> ListArray
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Builds the ListArray
and reset this builder.
Trait Implementations
impl<T: ArrayBuilder> ArrayBuilder for ListBuilder<T> where
T: 'static,
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T: 'static,
fn as_any(&self) -> &dyn Any
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Returns the builder as a non-mutable Any
reference.
fn append_data(&mut self, data: &[ArrayDataRef]) -> Result<()>
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Appends data from other arrays into the builder
This is most useful when concatenating arrays of the same type into a builder.
fn data_type(&self) -> DataType
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Returns the data type of the builder
This is used for validating array data types in append_data
fn as_any_mut(&mut self) -> &mut dyn Any
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Returns the builder as a mutable Any
reference.
fn into_box_any(self: Box<Self>) -> Box<dyn Any>
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Returns the boxed builder as a box of Any
.
fn len(&self) -> usize
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Returns the number of array slots in the builder
fn is_empty(&self) -> bool
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Returns whether the number of array slots is zero
fn finish(&mut self) -> ArrayRef
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Builds the array and reset this builder.
impl<T: Debug + ArrayBuilder> Debug for ListBuilder<T>
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Auto Trait Implementations
impl<T> RefUnwindSafe for ListBuilder<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<T> Send for ListBuilder<T> where
T: Send,
T: Send,
impl<T> Sync for ListBuilder<T> where
T: Sync,
T: Sync,
impl<T> Unpin for ListBuilder<T> where
T: Unpin,
T: Unpin,
impl<T> UnwindSafe for ListBuilder<T> where
T: UnwindSafe,
T: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,