Trait lance_arrow::FixedSizeListArrayExt

pub trait FixedSizeListArrayExt {
    // Required methods
    fn try_new_from_values<T: Array + 'static>(
        values: T,
        list_size: i32
    ) -> Result<FixedSizeListArray, ArrowError>;
    fn sample(&self, n: usize) -> Result<FixedSizeListArray, ArrowError>;
}

Required Methods

fn try_new_from_values<T: Array + 'static>( values: T, list_size: i32 ) -> Result<FixedSizeListArray, ArrowError>

Create an FixedSizeListArray from values and list size.

use arrow_array::{Int64Array, FixedSizeListArray};
use arrow_array::types::Int64Type;
use lance_arrow::FixedSizeListArrayExt;

let int_values = Int64Array::from_iter(0..10);
let fixed_size_list_arr = FixedSizeListArray::try_new_from_values(int_values, 2).unwrap();
assert_eq!(fixed_size_list_arr,
    FixedSizeListArray::from_iter_primitive::<Int64Type, _, _>(vec![
        Some(vec![Some(0), Some(1)]),
        Some(vec![Some(2), Some(3)]),
        Some(vec![Some(4), Some(5)]),
        Some(vec![Some(6), Some(7)]),
        Some(vec![Some(8), Some(9)])
], 2))

fn sample(&self, n: usize) -> Result<FixedSizeListArray, ArrowError>

Sample n rows from the FixedSizeListArray

use arrow_array::{Int64Array, FixedSizeListArray, Array};
use lance_arrow::FixedSizeListArrayExt;

let int_values = Int64Array::from_iter(0..256);
let fixed_size_list_arr = FixedSizeListArray::try_new_from_values(int_values, 16).unwrap();
let sampled = fixed_size_list_arr.sample(10).unwrap();
assert_eq!(sampled.len(), 10);
assert_eq!(sampled.value_length(), 16);
assert_eq!(sampled.values().len(), 160);

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl FixedSizeListArrayExt for FixedSizeListArray

fn try_new_from_values<T: Array + 'static>( values: T, list_size: i32 ) -> Result<Self, ArrowError>

fn sample(&self, n: usize) -> Result<FixedSizeListArray, ArrowError>

Implementors