Struct ScalarZipper 

pub struct ScalarZipper {
    zip_impl: Arc<dyn ZipImpl>,
}

Zipper for 2 scalars

Useful for using in IF <expr> THEN <scalar> ELSE <scalar> END expressions

Example

let scalar_truthy = Scalar::new(Int32Array::from_value(42, 1));
let scalar_falsy = Scalar::new(Int32Array::from_value(123, 1));
let zipper = ScalarZipper::try_new(&scalar_truthy, &scalar_falsy).unwrap();

// Later when we have a boolean mask
let mask = BooleanArray::from(vec![true, false, true, false, true]);
let result = zipper.zip(&mask).unwrap();
let actual = result.as_primitive::<Int32Type>();
let expected = Int32Array::from(vec![Some(42), Some(123), Some(42), Some(123), Some(42)]);

Fields

zip_impl: Arc<dyn ZipImpl>

Implementations

impl ScalarZipper

pub fn try_new( truthy: &dyn Datum, falsy: &dyn Datum, ) -> Result<Self, ArrowError>

Try to create a new ScalarZipper from two scalar Datum

Errors

returns error if:

• the two Datum have different data types
• either Datum is not a scalar (or has more than 1 element)

pub fn zip(&self, mask: &BooleanArray) -> Result<ArrayRef, ArrowError>

Creating output array based on input boolean array and the two scalar values the zipper was created with See struct level documentation for examples.

Trait Implementations

impl Clone for ScalarZipper

fn clone(&self) -> ScalarZipper

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScalarZipper

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

Formats the value using the given formatter.