Struct SingleRowListArrayBuilder 

pub struct SingleRowListArrayBuilder {
    arr: ArrayRef,
    nullable: bool,
    field_name: Option<String>,
}

Creates single element [ListArray], [LargeListArray] and [FixedSizeListArray] from other arrays

For example this builder can convert [1, 2, 3] into [[1, 2, 3]]

Example

// Array is [1, 2, 3]
let arr = ListArray::from_iter_primitive::<Int64Type, _, _>(vec![Some(vec![
    Some(1),
    Some(2),
    Some(3),
])]);
// Wrap as a list array: [[1, 2, 3]]
let list_arr = SingleRowListArrayBuilder::new(Arc::new(arr)).build_list_array();
assert_eq!(list_arr.len(), 1);

Fields

arr: ArrayRef

array to be wrapped

nullable: bool

Should the resulting array be nullable? Defaults to true.

field_name: Option<String>

Specify the field name for the resulting array. Defaults to value used in [Field::new_list_field]

Implementations

impl SingleRowListArrayBuilder

pub fn new(arr: ArrayRef) -> Self

Create a new instance of SingleRowListArrayBuilder

pub fn with_nullable(self, nullable: bool) -> Self

Set the nullable flag

pub fn with_field_name(self, field_name: Option<String>) -> Self

sets the field name for the resulting array

pub fn with_field(self, field: &Field) -> Self

Copies field name and nullable from the specified field

pub fn build_list_array(self) -> ListArray

Build a single element [ListArray]

pub fn build_list_scalar(self) -> ScalarValue

Build a single element [ListArray] and wrap as ScalarValue::List

pub fn build_large_list_array(self) -> LargeListArray

Build a single element [LargeListArray]

pub fn build_large_list_scalar(self) -> ScalarValue

Build a single element [LargeListArray] and wrap as ScalarValue::LargeList

pub fn build_fixed_size_list_array(self, list_size: usize) -> FixedSizeListArray

Build a single element [FixedSizeListArray]

pub fn build_fixed_size_list_scalar(self, list_size: usize) -> ScalarValue

Build a single element [FixedSizeListArray] and wrap as ScalarValue::FixedSizeList

fn into_field_and_arr(self) -> (Arc<Field>, ArrayRef)

Helper function: convert this builder into a tuple of field and array

Trait Implementations

impl Clone for SingleRowListArrayBuilder

fn clone(&self) -> SingleRowListArrayBuilder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SingleRowListArrayBuilder

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

Formats the value using the given formatter.