Method from_unary

arrow-array/src/array/boolean_array.rs:274–284

Create a [`BooleanArray`] by evaluating the operation for each element of the provided array ``` # use arrow_array::{BooleanArray, Int32Array}; let array = Int32Array::from(vec![1, 2, 3, 4, 5]); let r = BooleanArray::from_unary(&array, |x| x > 2); assert_eq!(&r, &BooleanArray::from(vec![false, false, true, true, true])); ```

(left: T, mut op: F)

    /// assert_eq!(&r, &BooleanArray::from(vec![false, false, true, true, true]));
    /// ```
    pub fn from_unary<T: ArrayAccessor, F>(left: T, mut op: F) -> Self
    where
        F: FnMut(T::Item) -> bool,
    {
        let nulls = left.logical_nulls();
        let values = BooleanBuffer::collect_bool(left.len(), |i| unsafe {
            // SAFETY: i in range 0..len
            op(left.value_unchecked(i))
        });
        Self::new(values, nulls)
    }

    /// Create a [`BooleanArray`] by evaluating the binary operation for
    /// each element of the provided arrays