Function filter 

pub fn filter(array: &dyn Array, mask: &Mask) -> VortexResult<ArrayRef>

Keep only the elements for which the corresponding mask value is true.

Examples

use vortex_array::{Array, IntoArray};
use vortex_array::arrays::{BoolArray, PrimitiveArray};
use vortex_array::compute::{ filter, mask};
use vortex_error::VortexResult;
use vortex_mask::Mask;
use vortex_array::scalar::Scalar;

let array =
    PrimitiveArray::from_option_iter([Some(0i32), None, Some(1i32), None, Some(2i32)]);
let mask = Mask::from_iter([true, false, false, false, true]);

let filtered = filter(array.as_ref(), &mask)?;
assert_eq!(filtered.len(), 2);
assert_eq!(filtered.scalar_at(0)?, Scalar::from(Some(0_i32)));
assert_eq!(filtered.scalar_at(1)?, Scalar::from(Some(2_i32)));

Panics

The predicate must receive an Array with type non-nullable bool, and will panic if this is not the case.